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Operating instructions

METTLER TOLEDOAT balances

Subject to technical changes and to the availabilityof the accessories supplied with the instruments.

To protect your METTLER TOLEDO product‘s future:METTLER TOLEDO Service assures the quality, measuring accuracy andpreservation of value of all METTLER TOLEDO products for years to come.Please send for full details about our attractive terms of service.Thank you.

Safety has priority

– It is essential you consult the instructions in section 1.2 regarding putting your new balance intooperation.

– The AT balances may be operated when connected to receptacle outlets with a ground connection.

– The AT balances must not be operated in hazardous surroundings.

– Never open the balance, it contains no parts which can be serviced, repaired or changed by the user.In the unlikely event you experience problems with your balance, please contact the responsibleservice facility.

Thank you for purchasing a METTLER TOLEDO AT analytical balance.The AT balances combine a wide range of weighing and setting options with an exceptional ease of operation.

Please read these operating instructions through carefully so that you can utilize all possibilities offered by your AT balance to thefull. These operating instructions also offer valuable support in the form of a glossary and an index.

The present operating instructions apply to all METTLER TOLEDO balances of the AT series. As the various models have differentperformance characteristics, however, special mention is made in the text where this is important for the operation.

Please read through the enclosed booklet “Weighing the right way”. It is intended as a supplement to these operating instructionsand contains additional important tips and informations.

If you fold out this page, you will have an overview of your AT balance that shows you all features at a glance.

Operating instructions METTLER TOLEDO AT balances

*P11780209*

© Mettler-Toledo GmbH 1998 11780209A Printed in Switzerland 9807/2.12

Mettler-Toledo GmbH, Laboratory & Weighing Technologies, CH-8606 Greifensee, SwitzerlandPhone +41-1-944 22 11, Fax +41-1-944 30 60, Internet: http://www.mt.com

Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com

Page5 Special applications and functions of your

AT balance ................................................................................... 405.1 Your AT can work with two weight units ........................................ 405.2 Your AT also weighs in percent and displays plus/minus

deviations ...................................................................................... 415.3 Should your AT count pieces? ...................................................... 435.4 How to trigger the adjustment manually ........................................ 465.5 How to check whether the balance is still

adjusted correctly .......................................................................... 495.6 How to print out the weighing result .............................................. 515.7 Your AT can also be remote controlled ......................................... 52

6 Important information regarding your AT ................................. 536.1 The AC adapter offers you various installation

options ........................................................................................... 536.2 If you change the location of your AT ............................................ 556.3 A well maintained balance is a joy forever .................................... 566.4 What your AT brings with it ........................................................... 576.5 Additional information and accessories for your

AT balance .................................................................................... 57

7 Any questions? ........................................................................... 587.1 What happens if the weight display is unstable? .......................... 587.2 How can the weighing speed be increased? ................................. 617.3 What happens if...? ....................................................................... 627.4 What does this error message mean? .......................................... 667.5 What does this term mean? .......................................................... 677.6 How are weight units converted? .................................................. 787.7 Where will I find details of...? ........................................................ 80

Technical specifications ................................................................ 84

1 Key «Re-Zero», «Set», «On/Off»2 Key «0.1/0.01 mg» (with dual-range balances only),

«Cancel»3 Key «Menu», «Configuration»4 Key «Select 1»5 Key «Select 2»6 Key «Print»7 Key “““““8 Glass draft shield9 Coupling element

10 Coupling element11 Coupling element12 Coupling element13 Door handle14 Door drive handle15 Weighing pan16 Draft cover17 Level18 Connection for foot or hand switch and electrical

contacts19 Connection for data interface20 Connection to overhead display21 Plug-in slot for program cassette22 Program cassette, protection of the configuration

parameters23 Connection for AC adapter24 Screw feet25 Digital display (VFD or LCD)26 Status indicators27 Weight units28 DeltaTrac®

⇔⇔


Contents

Page

1 The AT smooths the way .............................................................. 11.1 The new weighing feeling ................................................................ 11.2 Preparing your AT ........................................................................... 21.3 Weighing made simple .................................................................... 5

2 Your AT - a balance with extreme ease of operation ................. 82.1 A glass draft shield with unlimited possibilities ................................ 82.2 The Mettler DeltaTrac - an informative display ............................. 112.3 Is your AT a Mettler DeltaRange balance? ................................... 112.4 How you can weigh in the coarse and fine range ......................... 12

3 Individual adaptation of your AT ............................................... 143.1 What is the menu? ........................................................................ 143.2 How to adapt your AT to different types of weighing ..................... 173.3 How to adapt your AT to the local conditions ................................ 193.4 How to switch off the fully automatic door function ....................... 20

4 Additional possibilities in the configuration register .............. 224.1 What is the configuration register? ................................................ 224.2 How is the configuration register used? ........................................ 234.3 In the first sector you return to the factory setting ......................... 264.4 The second sector offers you numerous adaptation

possibilities .................................................................................... 274.5 In the third sector you select the weight units

and additional settings .................................................................. 324.6 In the fourth sector the AT reveals itself as a balance

ready to communicate ................................................................... 354.7 Print out the current configuration ................................................. 384.8 How to protect your settings against inadvertent

changes ......................................................................................... 39

Printed on 100 % chlorine-free Paper, for the sake of our environment.




1


1 The AT smooths the way

1.1 The new weighing feeling

Your AT balance offers a wide range offunctions, yet is simple to operate.

For example, there is no need what-ever to concern yourself with theadjustment - your AT performs theadjustment fully automatically. Your ATis equipped with an adjustable glassdraft shield with a fully automatic doorfunction. Just two examples to give youa preview of the full range of equipmentof your new balance.

Your AT balance is distinguishedprimarily, however, by its user friendli-ness. You set the balance up, connectit to the power supply and after a fewminutes warm-up time you can imme-diately start weighing. You thus obtainyour first weighing result in the shortesttime possible.

The AT offers you the operating conve-nience and the complete range ofoptions you expect from a top-qualityanalytical balance. There is, however,no need for you to grapple at themoment with functions you will notneed until later.

In this first section you will find out howsimply you can start up your AT andperform normal weighings.


2


- Firm, vibration-free location, as levelas possible

- No direct sunlight

- No extreme temperature fluctua-tions

- No excessive drafts (e.g. throughpowerful air aWnditioning)

Additional tips and information regar-ding an optimum location can be foundin the METTLER TOLEDO brochure -“Weighing the right way” , which isenclosed with your balance.

1.2 Preparing your AT

If you fold out the front fold-out, youhave in front of you an immediateoverview of all general illustrationsat a glance.

You need undertake the followingoperations only on first-time installationand each time you change the balancelocation.

Select a suitable location

Your AT expresses its thanks for anoptimum location by providing you withexcellent weighing results:


3


How you can transport the balance

When you position your AT balance atits location, please note the following:

To transport the balance, hold it at thefront under the display and at the rearbeneath the balance housing. Never liftyour AT using the draft shield or the«Re-Zero» key!

Mount the draft cover and level thebalance

- Place the draft cover 16 suppliedseparately in position. When posi-tioning the draft cover, ensure that itis not touched by the weighing pan,which must move freely in itsrecess. If necessary, turn theweighing pan to the correctposition. The draft cover is usefulprimarily for balances with thesemimicro range (readability 0.01mg). In many cases it need not beinstalled in weighings in theanalytical range (readability 0.1mg).As an option, semimicro balancescan be equipped with an additionalinner draft shield whose installationis described in the enclosedmounting instructions.

- Turn the two screw feet 24 at therear of the balance housing untilthe air bubble is in the middle oflevel 17.


4


STANDBY

Prepare the glass draft shield

The draft shield of your AT balancecomprises several parts which can becombined in a number of ways usingthe coupling elements. To precludetransport damage, these couplingelements are not locked in positionwhen shipped. Connect the individualparts of the draft shield as follows:

- Pull all doors of the draft shield andthe opposing door holder 14 for-wards as far as possible.

- Push the two upper couplingelements 9 and 10 upward and thetwo lower coupling elements 11 and12 downward until they lock.

When in this position, the whole draftshield opens. Additional combinationpossibilities of the individual doors aredescribed in Section 2.1.

Connect your AT to the powersupply

- Connect the AC adapter supplied toconnection socket 23 at the rear ofyour AT balance and then to thepower supply.

- The AC adapter can either beplaced on the bench, attached tothe balance or, to save space, bemounted on the wall. The AC adap-ter holder and the installation setwith dowels and screws are usedfor this. Appropriate details aregiven in Section 6.1.

After connection, your AT balance ison standby and ready for weighingafter a brief warm-up time of about 5minutes. (See also Technicalspecifications page 84).


5


⇔

1.3 Weighing made simple

- By pressing the «On/Off» key youswitch your AT from standby to theweighing mode . The balance nowperforms a brief self-test and alldisplay segments light up briefly.

- If the draft shield is open, you canclose it by pressing one of the twokeys .

Your AT balance is fitted with a fullyautomatic door function, which ensuresthat the draft shield is always open orclosed at the right time. Section 3.4describes how you can switch off thisautomatic mechanism. On completionof the self-test, this function opens thedraft shield completely automatically.

Set your balance to zero (taring):

- If you wish to tare a container, placeit on the balance.

- Press the «Re-Zero» key. The fullyautomatic door function closes thedraft shield.

Zeroing of the display (taring) is auto-matic. While the zeroing is in progressand the horizontal segments appear inthe display, you can abort the processby briefly pressing the «Re-Zero» keyagain.

Max 205 g d = 0.1 mgAT201 METTLER TOLEDO pro�FACT

Max 205 g d = 0.1 mgAT201 METTLER TOLEDO

METTLER

χ ⇔ χ ⇔

Configuration

Menu

Cancel0.1/0.001 mg

Select 2Select 1

Set Re-Zero On/Off

Print

pro�FACT

- - - - - -


6


As soon as the warning beep sounds,zeroing of the balance is complete andthe fully automatic door function opensthe draft shield.

- Load the weighing sample andpress the «Print» key. The fullyautomatic door function closes thedraft shield.

- The triangle symbol (print symbol)and the circle symbol of the stabilitydetection (ASD) appear in thedisplay.

- When the symbol of the stabilitydetector (ASD) fades, the warningbeep sounds; the triangle symbolalso fades and the draft shieldopens automatically.Note : You can also open and closethe draft shield with one of the keys or by hand.

- Read off the weighing result. Theresult remains “frozen” on thedisplay for 5 seconds. This can berecognized by the flashing circleabove the weighing unit. If thebalance is attached to a printer, theweighing result is automaticallyprinted out.With this automatic door func-tion, your work steps in weighingare reduced from 9 to 5! (Youdon't have to open and close thedraft shield twice.)

It is possible that the warning beepsounds during a weighing and theadjacent symbol appears in the display.Your AT balance uses this to show thatit would like to adjust itself. But there isno need for you to interrupt your workas the balance waits until you have notcarried out any weighings for a periodof about 5 minutes and then performsthe fully automatic self-adjustment(proFACT). The symbol remains lit upuntil the balance has adjusted itself oruntil you trigger the adjustment by a

⇔

0.00005.34678

g

5.34678

0.3675

AUTOCALIN

5.34678

On/Off

Print

Select 2

METTLER TOLEDO

⇔


7


keystroke. Section 5.4 shows you howto trigger the adjustment yourself.

- For switching off the balance, liftup the «On/Off» key briefly frombelow. This closes the draft shieldautomatically if the fully automaticdoor function is switched on. Other-wise, close the draft shield manuallyto prevent the ingress of dust anddirt.

After being switched off, the balance ison standby . When it is switched onagain, it needs no warm-up time and isin immediate operational readiness.

STANDBY

Some additional tips:

- If you have made a mistake duringweighing, there is no need to worry:Simply switch your AT off and thenimmediately on again. You will laterlearn of other possibilities to bringyour AT to weighing readinessagain.

- You can also effect the zeroing(taring) of the balance using thefoot or hand switch (available asan accessory) attached to thebalance via connection 18. Opera-tion with the foot switch leaves youboth hands free for loading your AT.


8


- If you ever have to disconnect yourAT from the power supply, firstswitch it off by lifting up the «On/Off» key. After the balance hasbeen reconnected, it is in thestandby mode and “STANDBY”appears in the display.

After an unexpected power outage,however, or if you have notswitched off your AT before discon-necting it from the power supply,when power is restored again“–OFF–” appears in the display.When the «On/Off» key is nowpressed, in this case an extended,internal self-test is first performed.Here the model designation and thesoftware version are briefly dis-played, and all display segmentslight up for a short space of time.

2 Your AT - a balance with extremeease of operation

2.1 A glass draft shield withunlimited possibilities

With the glass draft shield you canadapt your AT balance to the localconditions (principally drafts), to yourindividual style of weighing, to the sizeof the tare containers, and to the typeof weighing and loading.

The fixed bars of a traditional draftshield prevent access to the weighingchamber.


9


The draft shield of the AT balance hasno fixed bars and the weighing cham-ber is freely accessible. Your AT is thusalso especially well suited to automaticloading.

The left, right and upper doors of thedraft shield can be combined in anyway and hence matched to yourweighing needs by means of thecoupling elements 9 to 12.Try out various combinations by shiftingthe coupling elements upward anddownward. For the manual dooroperation the coupling elements 11 and12 must always be disengaged (topposition)!

When small weighing samples haveto be loaded, we advise you to openonly one of the two side doors. Yourbalance then operates quicker sincethe disturbing air currents are lessthan when more doors of the draftshield are open.You can operate the draft shieldmanually in the traditional manner.


10


A further tip: You will obtain the mostaccurate results in the quickest possi-ble manner if you close the draft shieldcompletely during weighing! If this isnot possible, for instance with bulkyweighing samples, you should combinethe doors of the draft shield such thatthe greatest possible part of the draftshield remains closed during theweighing.

So that excellent weighing results canalso be achieved fast under difficultweighing conditions, you can also usean inner draft shield.(Order number 210270)

For loading the balance, open onlyas many doors as necessary. Withrelatively small weighing samples orrather small tare containers, it isnormally sufficient to open a singledoor. This lessens the influence ofdrafts and speeds up the weighingprocess.

⇔

The semiautomatic operation can beeffected either with the left or the right key. In this case, the draft shield isopened and closed by the motor.

In certain applications, such as zeroing(taring) of the balance, the draft shieldopens and closes fully automaticallyas you already know from your firstweighing. Manual or semiautomaticoperation is also possible when thefully automatic door function is operati-ve. The fully automatic door functionprimarily facilitates work with the singleor twin foot switch. Section 3.4 showsyou how to switch off the fullyautomatic door function.

0.1/0.01mg

⇔

METTLER TOLEDO

On/Off

Print

Select 2

Set

Cancel

Configuration

Menu

Select 1⇔

Max 205 g d = 0.01 mgAT201 Pro�FACT

⇔


11


24.083

98.215

2.2 The DeltaTrac® - aninformative display

The DeltaTrac® 28 is a supplement tothe digital display 25. It provides youwith a pictorial representation of theweighing range in use and that stillremaining. The dynamics of aweighing process can be followed onthe DeltaTrac® extremely well. Simplyobserve the DeltaTrac® during aweighing and you will immediatelyunderstand its function.

The DeltaTrac® gives you a new feelfor weighing, even with specialapplications, for example in repeatedweighing in to a specified target valueand in percent weighings. You will findfurther details in Section 5.2.

2.3 Is your AT a DeltaRange®balance?

The AT261 and AT460 models areDeltaRange® balances. They have aten times more accurate, movable finerange, which shows an additionaldecimal place. Thus, for example, theAT261 has a resolution of 0.1 mg overthe entire weighing range and amovable fine range with a resolution of0.01 mg.This fine range can be called up at anypoint in the whole weighing range asoften as liked.

The movable fine range covers 62 g forboth models. Each time you set thebalance to zero (tare) with the «Re-Zero» key, the fine range is switched in.If the span of the fine range isexceeded, the balance automaticallyswitches into the coarse range. The finerange can be called up again byrezeroing the balance once more usingthe «Re-Zero» key.


12


Note:This ten times more accurate movablefine range also remains active indifferential weighing.

2.4 How you can weigh in thecoarse and fine range

Semimicro and DeltaRange® balancesof the AT series are equipped with aswitch key which you can use to switchfrom the coarse range to a ten timesmore accurate fine range.

The AT thus allows you to work in therange best suited to your needs.

If, for example, instead of a highresolution you need a stable weighingresult as rapidly as possible, you switchfrom the fine range to the course rangeusing the switch key. This makes yourAT very fast and the weighing resultsare extremely stable.

You can thus also disable theDeltaRange® if you do not need it.


13


- Press the «0.1/0.01 mg» key (e.g.with AT201/AT261 DeltaRange®)and …

- …the balance operates in the tentimes more accurate fine range.

- By pressing the «0.1/0.01 mg» keyagain, you can return to the coarserange.

You have the following selectableranges available:

Balance Coarse Fine Keyrange range

AT20 0.01 mg 2 µg 10 / 2 µg

AT201 0.1 mg 0.01 mg 0.1 / 0.01 mg

AT261 0.1 mg 0.01 mg 0.1 / 0.01 mg

AT460 1 mg 0.1 mg 1 / 0.1mg

With the «0.1/0.01 mg» key (e.g. withAT201/AT261 DeltaRange®) you canswitch between the coarse and the finerange:

- The balance is measuring in thecoarse range

12.6439

12.64387

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg


14


Overview of the menu functions:- reference weight in %- reference weight in pieces- adjustment- weighing process adapter- vibration adapter- fully automatic door functionYou will find a detailed overview ofthe menu on pages 82 and 83.

In addition, you can also perform se-veral operational steps in the menu forspecial applications (percent weighingand piece counting). Section 5 of theseoperating instructions provides you withmore information.

We encourage you to experiment withthe menu to familiarize yourself with it.You need have no worries here: Bypressing the «Cancel» key you canreturn to the weighing mode at anytime without changing the storedsettings!

3 Your AT is an adaptable balance

For the optimization of your weighingresults and adaptation to your weighingneeds, the AT offers you additionalsetting options. You undertake theseadaptations in the menu , which you willnow be introduced to.

You can set additional parameters inthe second menu tree of your AT, theconfiguration register (section 4).

3.1 What is the menu?

In the menu you match your balance tothe local conditions and to the weighingtasks. The menu contains variousadaptation possibilities, the menuoptions, which in turn offer differentsetting options.

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg


15


You perform your weighings in theweighing mode , the operational modeof your balance. Weighing mode andmenu are separate. By pressing andholding the «Configuration» key youcan call up the configuration register.You can also select the different menuoptions and setting possibilities withkeystrokes.

«Menu» key

- Selection of the menu by brieflypressing the key in the weighingmode

- Selection of the individual menuoptions

«Select 1» key

- Selection of the setting in a menuoption

«Set» key

- Confirmation of your selection andreturn to the weighing mode. Theselected settings are stored andremain so even after the balancehas been switched off.

«Cancel» key

- Exit the menu and return to theweighing mode without any chan-ges being made. If you have madea wrong selection, you can leavethe menu at any time by pressingthe «Cancel» key. You are then inthe weighing mode again withoutany change in the settings.Instead of pressing the «Cancel»key, you can naturally switch thescale off and then on again.

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg


16


By repeated pressing of the «Menu»key, all available menu options appearin the display in succession:

- proFACTfully automatic adjustment andlinearization

- Adaptation to the type of weighing(weighing process adapter)

- Adaptation to the local conditions(vibration adapter)

- Automatic door function of the draftshield

CAL Int

door Auto

A complete overview of the menu canbe found on the pages 82 and 83.

Some additional tips:

- Not all menu options are constantlyor exactly displayed in the formshown; some of them, e.g. thesetting of reference weights (“Set100%”) depend on additionalsettings in the configuration register,which we will introduce you to inSection 4 of these operating instruc-tions.

- If you are in the menu and press nokey for about 1 minute , the ATreturns automatically to theweighing mode. Any changes inthe settings made up to this pointare ignored in this case.


17


3.2 How to adapt your AT todifferent types of weigh-ing

Your AT balance can be matched todifferent types of weighing (fine dis-pensing, absolute weighing, etc.) verysimply. It is equipped for this purposewith the so-called weighing processadapter, which can be set in the menu.

- Select the menu by pressing the«Menu» key briefly.

- Press the «Menu» key repeatedlyuntil the drop symbol of the weigh-ing process adapter appears in thedisplay.

- Select the appropriate setting withthe «Select 1» key:

- In the following 3 sections you willget to know the three menu options(weighing process adapter, vibrationadapter and automatic door func-tion) in detail. The additional settingoptions for special applications(weighing in reference weights forpercent weighings or piece countingand the adjustment) will be introdu-ced in Section 5.

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg


18


In this position the drop symbol isinvisible, the weighing processadapter is switched off. This settingis suitable only for special appli-cations in which not only the finalresult but also the dynamics of theweighing process are of interest, forexample the recording of weightchanges due to evaporation againsttime.

- When you have selected the appro-priate setting, press the «Set» key .This makes the settings activeimmediately, and the balancereturns to the weighing mode.

This is the universal settingsuitable in principle for all types ofweighing. This setting is preset inthe factory.

The position absolute weighing issuitable for the rapid checking of aweight. During the weighing in, thelast decimal place is suppressed.

If you wish to employ fine dis-pensing (weighing in) of a finepowder or small amounts of liquid,select the weighing in position.This provides a continuous displayof all decimal places, and the weightincrease can thus be followedeasily.

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg


19


With the so-called vibration adapteryour AT balance can be matched in themenu to the local conditions.

- Select the menu.

- Press the «Menu» key repeatedlyuntil the wave symbol of the vibra-tion adapter appears in the display.

- Select the appropriate setting withthe «Select 1» key:

3.3 How to adapt your AT tothe local conditions

For all weighings, we advise youalways to open the draft shield only asfar as necessary. You thus achievestable weighing results as quickly aspossible.

If, despite a closed draft shield, nostable weighing results are found, thecause could lie with unfavorable localconditions such as vibrations. Veryminor, hardly noticeable vibrations ofthe weighing table are usually involved.

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg


20


This setting is suitable for normalambient conditions; the balanceoperates at moderate speed in thiscase. This position is set in the factory.

This setting is suitable for work inunquiet surroundings. The balanceoperates more slowly, but is lesssensitive to external disturbances.

This setting is suitable for very quietand stable surroundings. The balan-ce operates very rapidly, but is relati-vely sensitive to external disturbances.

- When you have selected the appro-priate setting, press the «Set» key.The chosen setting then immediate-ly becomes active, and the balancereturns to the weighing mode.

Note:A further reason for an unstable displayof the weighing result could lie, forinstance, with electrostatic charging ofthe weighing sample or the container.You will find additional informationregarding this in Section 7.1.

3.4 How to switch off thefully automatic doorfunction

You are already familiar with theconvenient automatic door function ofyour AT balance from your first weigh-ing. When the automatic door operationis switched on, the draft shield closesautomatically after the «Re-Zero» key(zeroing/taring) or the «Print» key(printout of the weighing result, seeSection 5.6) has been pressed. Assoon as the weight display is stable,the draft shield is reopened for the nextweighing operation (e.g. weighing in,loading the balance). The draft shield isthus always in the correct position forthe next weighing process. Routine

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg


21


work is particularly facilitated by thisautomatic operation. It is also useful inthe percent weighing (Section 5.2) andpiece counting (Section 5.3) applica-tions. When the twin foot switch (seebrochure is used, the automatic opera-tion leaves both hands free for weig-hing in.

If you wish to operate the draft shieldmanually or semiautomatically via thetwo keys, however, you can switchoff the automatic door operation:

- Select the menu.

- Press the «Menu» key repeatedlyuntil the adjacent display appears.

- Using the «Select 1» key, you cannow switch the automatic door ope-ration off and on again:

⇔door Auto

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg


22


Fully automatic door functionswitched on

Fully automatic door functionswitched off

- Activate the chosen setting bypressing the «Set» key and you willbe returned once again to theweighing mode.

door Auto

door Std

SEtt INGS

SCALE

4 Additional possibilities with your AT

In addition to the menu, the AT offersyou further, very specific adaptationpossibilities. You perform these adapta-tions in the configuration register ,which we will introduce you to in thefollowing section.

4.1 What is the configurationregister?

The configuration register is dividedinto four sectors in which you can varythe following settings:- Operational setting

• Reset

- Basic settings• ASD, automatic stability detector• Readability• Readability in the semimicro

range• Autozero• proFACT, adjustment and

linearization

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg


23


- Weighing unitsweighing unit 1weighing unit 2status indicatorbeeper

- Interfacedata transmission modedata transmission rateparitytransmission protocolend-of-line mode

You will find further details on theadjustment parameters on pages 82and 83.

Unit

Int -FACE

4.2 How is the configurationregister used?

Hold the short-form operatinginstructions in your hand. You willthen have the complete configura-tion register at a glance in front ofyou.

We would like to encourage you toexperiment with the configurationregister to familiarize yourself with it.You need have no worries on thisscore: By pressing the «Cancel»key, you can return at any time tothe weighing mode without any ofthe stored settings being altered!


24


By pressing and holding the«Configuration» key, you call up theconfiguration register.You select the different- sectors («Configuration» key)- parameters («Select 1» key)- settings («Select 2» key)by simply pressing the appropriate key.In contrast to the menu, you also needthe «Select 2» key for operation of theconfiguration register.

«Configuration» key

Selection of the configurationregister from the weighing mode bypressing and holding the key(about 5 seconds). You are thenalready in the first sector.

Selection of the individual sectorsin the configuration register with abrief keystroke. After the last sectoryou are returned to the first.

«Select 1» key

Selection of the parameters in asector. After the last parameter inthis sector you are returned to thefirst.

«Select 2» key

Selection of the desired setting of aparameter. After the last setting of aparameter, you are returned to thefirst.

«Set» key

Confirmation of your selection andreturn to the weighing mode. Theselected settings are stored andremain so even after the balancehas been switched off or disconnec-ted from the power supply.

0.1/0.01mg

⇔

METTLER TOLEDO

On/Off

Print

Select 2

Set

Cancel

Configuration

Menu

Select 1⇔


⇔

On/Off

Print

Select 2

METTLER TOLEDO

⇔

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg


25


«Cancel» key

Exit the configuration register andreturn to the weighing mode with-out any changes being stored. Ifyou have made a wrong selection,you can quit the configurationregister at any time by pressing the«Cancel» key. You are then again inthe weighing mode without anysetting having been altered.Instead of pressing the «Cancel»key, you can also switch the balan-ce off, then immediately on again.

Your AT balance is naturally not sup-plied with an empty configurationregister. We have already includedstandard settings for you. You canrecognize these factory settings bythe asterisk in the upper left corner ofthe display.

2400 bd

A further tip:

If you are in the configuration registerand you do not press a key for about 1minute, your AT automatically returnsto the weighing mode. In this case, anyalterations in the settings are ignored.

In the following sections you will learnwhat parameters you can select in whatsectors, and what settings are avail-able. You will find the first example inthe setting of the parameter “Auto-matic stability detection” (ASD) inSection 4.4. In the following sections,you will also find recommendations forthe correct setting of your AT balance.Further useful tips are contained in theenclosed booklet “Weighing the rightway”.

Set

Cancel

Configuration

Menu

Select 1⇔


0.1/0.01mg


26


- Select the configuration register bypressing and holding the «Configu-ration» key. As soon as the displayshown opposite appears, releasethe key.

- You are now in the first sector(Settings) of the configurationregister.

- Select the first (and only) parameter(«Select 1» key ).

- Activate the resetting by pressingthe «Set» key, and the scalereturns automatically to the weig-hing mode. You again work with thefactory settings.

-ConF-

SEttINGS

rESEt

0.0000

4.3 In the first sector youreturn to the factorysettings

As you have learned in the precedingsection, the configuration register ofyour AT balance has been preset in thefactory. Even if you have modified thesettings, you can return to the factorysetting at any time.

But here all specific settings, eventhose in the menu, will be replacedby the factory settings!

You undertake the return to the factorysettings in the first sector (operationalsettings). This sector contains only asingle parameter:


27


4.4 The second sector offersyou numerous adaptationpossibilities

- Select the configuration register bypressing and holding the «Configu-ration» key. Then select the secondsector (basic settings) by pressingthe «Configuration» key briefly.

In this sector you can select thefollowing parameters and theirsettings:

Automatic stability detection (ASD)

Your AT possesses an automaticstability detection. As long as thebalance is unstable , the stabilitydetection symbol remains lit up in theupper left corner of the display. Thesymbol fades and the weighing result isreleased only when the result is within

SCALE

ASd

0.35

the limits selected by you for thestability.

You have a choice of eight settings. Inthe setting ASd–1– the display must bewithin a preset tolerance limit for onesecond for the result to be released asstable. In the setting ASd–7– the resultmust be within a preset tolerance limitfor several seconds before beingreleased.

- Select the first parameter, theautomatic stability detection (ASD),with the «Select 1» key.

- Select the appropriate setting withthe «Select 2» key. The followingillustration shows the relationshipbetween the repeatability and theweighing speed.


28


Readability (selection of the readoutincrements)

In this parameter you define the read-out increments (digits) for the lastdecimal place. Readout increments of1, 2, 5 and 10 are available, and theseare symbolized by the following settingoptions:

AT20 AT201 / AT261 AT460DeltaRange® / DeltaRange®AT200 / AT400

0.01 mg* 0.1 mg* 1 mg*0.02 mg 0.2 mg 2 mg0.05 mg 0.5 mg 5 mg0.1 mg 1 mg 10 mg

* = factory settings

Select readout increments as large asyour application allows; the larger thereadout increments, the faster theoperation of your balance.

Readability (Selection of the readoutincrements) in the fine range

This parameter is available only withsemimicro and DeltaRange® balances)!

d

dF

Stage Weighing Repeata-speed bility

offvery fast good

123 *4567 fast very good

In the oFF position, the balance doesnot wait for attainment of stability; eachresult is considered stable. This settingis used in special applications inconnection with the serial data interface(see also Section 4.6 “Data transmis-sion mode”).

* = factory setting


29


Autozero (AZ)

In this parameter you switch the auto-matic zeroing (autozero) on or off.When switched on, the zero is automa-tically corrected for drift or contamina-tion of the weighing pan.

- Autozero on *

- Autozero off

* = factory setting

For particular applications (e.g. evapo-ration measurements), it can be anadvantage to switch the autozerofunction off.

Here you define the readout increments(digits) for the last decimal place inweighings in the fine range. Readoutincrements of 1, 2, 5 and 10 are avail-able, and symbolized by the followingsetting options:

AT20 AT201 / AT261 AT460DeltaRange® DeltaRange®

2 µg* 0.01 mg* 0.1 mg*5 µg 0.02 mg 0.2 mg10 µg 0.05 mg 0.5 mg0.1 mg 0.1 mg 1 mg

* = factory settings

Select readout increments as large asyour application allows; the larger thereadout increment, the faster the opera-tion of the balance.

With the «0.1/0.01 mg» key you togglebetween the coarse and fine range ofDeltaRange® balances. Swit-ching ispossible only below a limit whichdepends on the model (see also Section2.4).

AZ

AZ

on

AZ

oFF


30


proFACTprofessional fully automatic adjust-ment and linearization technology

1. Adjustment

The two internal adjustment weightsare loaded. The display is adjusts sothat the loaded weight matches thedisplay-ed value. (Correction of theslope of the straight line).

2. Linearity

The internal weight m1 is loaded aloneand together with the weight m2. Thelinearity is adjusted using the differentdisplay values for m1 in both measure-ments. If the two displayed values,y

1

and y2, are equal, the linearity is

adjusted. (Correction of the deviationfrom the shape of an ideal straight line).

y2

y1

m1

m1m2

100%

50%

100%

CALIN

Auto on

CALIN

Display value

Loaded weight

Adjustment and linearization withproFACT

In this parameter you define theadjustment mode i.e., the way in whichyour balance should be adjusted andlinearized. The following possibilitiesare available:

- The AT balance adjusts andlinearize itself fully automaticallyby loading two internal adjustmentweights. The process is initiated assoon as a change in the operatingconditions makes this necessary.One of the most important initiationcriteria is a temperature fluctuationin the surroundings of ± 1.5 °C. Youdo not have to concern yourself withthe adjustment of the balance. Theadjustment and the simultaneouslinearization provide you with thesurety that the displayed valuematches the mass of the loadedweight over the entire weighingrange of your AT.


31


CALIN

CALIN

Auto oFF

USEr

In this mode you can also initiate thefully automatic adjustment and lineariz-ation at any time with a keystroke. Thisis practical, for instance, when your ATreports during a weighing that it wishesto adjust itself. Section 5.4 shows youhow to proceed in such a case.

- The fully automatic self-adjustmentwith linearization adjustment(proFACT) described above isswitched off. You can trigger theadjustment with the internaladjustment weights at a keystroke.After initiation, the adjustment runsautomatically, and at the same timethe measuring range is linearized.Section 5.4 shows you how toproceed in this case.

- You use your own, externaladjustment weight for theadjustment. The procedure isdescribed in Section 5.4 of theseoperating instructions. proFACT isnot active in this setting.

* = factory setting


32


4.5 In the third sector youselect the weight unitsand additional settings

Select the third sector (weight units) inthe configuration register.

In this sector you can select the follow-ing parameters and their settings:

Weight unit 1

The following weight units areavailable:

Display Name

g* grammg milligramoz ounceozt Troy ouncetl tael (see note)GN grain

dwt pennyweightct carat, metricC.M. carat, metric (GB)mo momme

* = factory setting

The number of decimal places in eachunit is dependent of the balance model.

By pressing the “““““ key, you togglebetween weight unit 1 (Unit 1) andweight unit 2 (Unit 2). Section 5.1provides you with further detailsregarding this switching. A conversiontable for the weight units is given inSection 7.6.

Note for weight unit tael:You have the possibility to choosebetween three national tael units:

If you have selected the tael unit withthe «Select 2» key, press the«Select 1» key until the adjacentdisplay appears.

Unit

Unit 1 û

HONg


33


With the «Select 2» key you can nowselect the desired national tael unit:

Hong Kong (factory setting)

Singapore, Malaysia

Taiwan (Republic of China)

Confirm your selection by pressing the«Set» key.

You need perform the selection of thenational tael unit you require only once.After this, whenever you configure taelas a weight unit, the national tael unityou have preselected will be used.

Unit 2 û

S9P NAL

rOC

HONg

Weight unit 2

You have available the same weightunits as with weight unit 1 and also theapplication units piece and percent:

Display Name

g grammg* milligramoz ounceozt Troy ouncetl tael (see note Tael under

weight unit 1)GN graindwt pennyweightct carat, metricC.M. carat, metric (GB)mo mommePCS piecesStk pieces (German)% percent

* = factory setting

The number of decimal places in eachunit depends on the balance model.


34


- The symbols are displayed perma-nently.

* = factory setting

Beeper setting

The audio acknowledgement beepsupports the operation of the balanceand the display audibly. You can switchit off or on.

- audio acknowledgement beepswitched on *

- audio acknowledgement beepswitched off

* = factory setting

bEEP

bEEP oFF

bEEP on

on

Auto

By pressing the key “““““, you togglebetween weight unit 1 (Unit 1) andweight unit 2 (Unit 2). You will findfurther details in Section 5.1. Aconversion table for the weight units isgiven in Section 7.6.

The application units «piece» and«percent» are described in detail inSections 5.2 and 5.3.

Graphic indicators

The graphic indicators 26, such as thesymbols for the vibration adapter andthe weighing process adapter, provideyou with an overview of the selectedsettings. These graphic indicators canbe switched on or off.

- A few minutes after the balance hasbeen switched on, the symbolsfade*.


35


Data transmission mode

The following setting options areavailable:

- Send stable: The first stable valueis transferred after initiation of theprint command after release by theautomatic stability detection. *

- Send all: The current value istransmitted after initiation of theprint command.

- Send automatically: The firststable value is transmittedautomatically after every weightincrease of at least 0.01 g.

- Send continuously: All preparedvalues are transmitted continuous-ly.

* = factory setting

S. StbInt-FACE

S.

S. ALL

S. Auto

S. Cont

4.6 In the fourth sector theAT reveals itselfas a balance ready tocommunicate

- Select the fourth sector in theconfiguration register (interface).

For the attachment of a non-METTLERTOLEDO printer or a PC you can selectthe parameters for the datatransmission via the serial datainterface and their settings in thissector. You will find more detailedinformation regarding use of theinterface in the instructions“Bidirectional Interface of theMETTLER TOLEDO AT balances”,which is available from METTLER-TOLEDO.


36


2400 bd

PAr -E-

bd

PAr

PAr -O-

Important note:

If you have switched off the automaticstability detection in sector 2 (ASD oFF),all weight values are regarded as beingstable. After the «Print» key has beenpressed in this case, the followingvalues are transmitted:

In setting S.Stb: The current value as inthe setting S.ALL.

In setting S.Auto: The first value after aweight change of more than 0.01 g.

Data transmission rate (baud rate)

The data transmission rate (baud rate)determines the speed of the transmis-sion via the serial interface. The unit isthe baud (1 baud (bd) = 1 bit/second).The following transmission rates areavailable:

- 150 db- 300 db- 600 bd- 1200 bd- 2400 bd *- 4800 bd- 9600 bd

* = factory setting

Parity

With the aid of the parity test, simple biterrors in the data transmission can berecognized by a parity check. Thefollowing setting options are available:

- Parity Even *

- Parity Odd


37


- No handshake

- Hardware handshake (DTR/CTS)

- Software handshake (XON/XOFF)

* = factory setting

End-of-line mode

Two setting options are available:

- Balance return and line feed at endof line*

- Balance return at end of line

* = factory setting

- Parity Off

- Parity Space

* = factory setting

Transmission protocol (HandShake)

These settings allow matching of thedata transmission to various serialreceivers. The following settings areavailable:

Pause of 1 second (for METTLER-TOLEDO GA42 Printer) *

- METTLER TOLEDO transmissionprotocol. In this operating mode, theend-of-line mode is automaticallyset to “crLF” and can not bechanged.

HS PAUSE

EOL crLF

PAr oFF

PAr SPc

HS

HS CL

HS oFF

HS HArd

HS Soft

EOL

EOL cr


38


Proceed as follows for the printout:

- Select the configuration register.

- Press the «Print» key, and thecurrent configuration will be printedout.

A further tip: Always print out yourspecific configuration. You thushave a record of your settings andeven if you return to the factorysettings, you can restore yourconfiguration at any time.

Important note:

If HS CL is set in the transmissionprotocol, the end-of-line mode is setautomatically to EOL crLF and can notbe changed.

4.7 Print out the currentconfiguration

You can print out the configurationcurrently stored on an attached printer.This record is useful if you work withdifferent configurations. You then knowat all times which values should be setfor which application.

On/Off

Print

Select 2

METTLER TOLEDO

⇔


39


4.8 How to protect your set-tings against inadvertentchange

As you know, with one press of the«Set» key your individual settings in theconfiguration register are stored. Theseare available at any time (even if thebalance has since been disconnectedfrom the power supply). You are not,however, protected against inadvertentalterations, for instance by otherbalance users.

To safeguard the settings, proceed asfollows:

- Disconnect the cable of the ACadapter from the receptacle.

- Remove the cover of the plug-in slot21 at the rear of your AT balance.

- Grasp the bracket of the programcassette 22 and withdraw thiscarefully from the plug-in slot 21.

- Remove the jumper with a thin pinor a needle from the contact pins.

- If you wish to protect your individualsettings in the configuration registeragainst inadvertent changes, placethe jumper across both contact pins.

- Slide the program cassette 22 intothe plug-in slot 21 up to the stopand replace the cover. Plug thecable of the AC adapter into thereceptacle.

unprotected

protected


40


If you have secured your settings,the configuration register is nolonger accessible and no more alter-ations can be made.

- To remove the safeguard, proceedin the reverse sequence.

5 Special applications and functions ofyour AT balance

Your AT balance is also prepared in thebest possible way for special cases.Applications and functions built in asstandard expand the possibilities ofyour AT balance and facilitate theoperation. The following section fami-liarizes you with these applications andfunctions.

5.1 Your AT can work withtwo weight units

With your AT balance you can togglebetween two preselected weight unitsat any time. Section 4.5 of theseoperating instructions shows you howto select and store these two weightunits in the configuration register.


41


You have, for example, selected “mg”as weight unit 1 and “ct” as weight unit2 in the configuration register. You canswitch between these two units at akeystroke:

The balance is now operating withweight unit 1.

- Press key “““““ briefly and…

- …the balance now works withweight unit 2. By pressing the “““““key again, you can return to weightunit 1.

The table in section 7.6 shows you theconversion factors between the variousweight units.

5.2 Your AT also weighs inpercent and shows plus/minus deviations

This built-in application allows you toweigh in to a preset value (100%) andto determine deviations from thistarget value.

So that this application appears in themenu, you must set the unit to percent(%) under the parameter “Weight unit2” (Unit 2 ) in the “Weight units” (Unit)sector of the configuration register asdescribed in Section 4.5.

- Press the «Menu» key briefly andthe AT requests you to load thereference weight.

Note: This request appears only ifweight unit 2 is set to percent (%).

68.4 µ

0.3422 ct

SEt 100 %

On/Off

Print

Select 2

METTLER TOLEDO

⇔

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg


42


⇔

- Open the draft shield and load thereference weight.

- Press the «Set» key and the draftshield closes automatically if theautomatic door function is switchedon. If not, close the draft shieldmanually or by pressing one of thetwo keys and then press key«Set».

As long as the horizontal dashes aredisplayed, your AT is weighing thereference weight.

- - - - - -

-2.5% 100% +2.5%

- As soon as the horizontal dashesdisappear, the reference weight hasbeen read in and your AT is readyfor weighing. If the automatic doorfunction is switched on, the draftshield opens automatically aftercompletion of the weighing process.If not, open it yourself. Remove thereference weight.

The DeltaTrac® now shows a plus anda minus marking that displays thetolerances of plus and minus 2.5%.

Now first weigh in coarsely:

- Place the empty container on thepan and set the balance to zero(taring).


43


- Add the weighing sample at asteady rate to the container until thecoarse indicator on the DeltaTrac®is pointing vertically downward.This shows that the approximatetarget weight has now beenreached.

Now perform the fine weighing:

- After the coarse weighing in, younow add the weighing samplecarefully until the fine indicator onthe DeltaTrac® is pointing verticallyupward.

- When the fine and the coarsepointers form a vertical line , the setweight is within ± 0.25% of thetarget.

coarse indicator

fine indicator

67.40 %

98.70 %

100.00

If you possess a dual-range balance(semimicro balance), you also have afine range available in the weightunit %, in which additional decimalplaces are displayed.

With the key “““““ you can display eitherthe percentage or the weight (seealso Section 5.1).

5.3 Should your AT countpieces?

First your AT needs to know that youwish to perform piece counting. Youmake this setting in the third sector ofthe configuration register (Unit ), whereyou set weight unit 2 (Unit 2 ) to PCS.This setting is described in Section 4.5.


44


- Set the scale to zero (taring).

- Your AT now needs the weight of areference piece number. Press the«Menu» key briefly.

Note:This menu selection appears onlywhen weight unit 2 is set to piece .

- Select the desired reference piecenumber with the «Select 1» key.The following piece numbers areavailable:

⇔

- Open the draft shield manually or bypressing one of the two keys .

- If you wish to count into a contai-ner, load the empty container.

- If you wish to count out of a contai-ner, load the full container.

SEt 10 PCS

Max 205 g d = 0.1 mgAT201 METTLER TOLEDO

METTLER

χ ⇔ χ ⇔

Configuration

Menu

Cancel0.1/0.001 mg

Select 2Select 1

Set Re-Zero On/Off

Print

pro�FACT

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg


45


⇔

- If you wish to count out of acontainer, remove the selectednumber of pieces from the contai-ner.

- Press the «Set» key, and the draftshield closes automatically if theautomatic door function is switchedon. If not, close the draft shieldmanually or by pressing the right-hand key and then press the«Set» key.

As long as the horizontal dashes aredisplayed, your AT is weighing thereference weight.

10 20 50 100

Note: We advise you to select areference piece number as large aspossible since your AT determinesthe average weight per piece. Sinceit is seldom the case that all piecesare equally heavy, the referenceweight that is stored is naturallymore accurate the greater thereference piece number.

- If you wish to count into acontainer, add the selected numberof pieces (reference piece number)of the weighing sample to thecontainer.

- - - - - -

SEt 10 PCS

SEt 20 PCS

SEt 50 PCS

SEt 100 PCS


46


With the key “““““ you can display eitherthe piece count or the weight (seealso Section 5.1).

5.4 How to trigger theadjustment manually

In the factory the balance is preset toproFACT. The AT balance adjusts andlinearizes itself as soon as a change inthe ambient conditions makes thisnecessary. You thus need not concernyourself with the adjustment. But youalso have the possibility to trigger themotorized adjustment with the internaladjustment weights at all times at akeystroke. This can be practical if theaudio warning beep sounds during aweighing and the adjacent symbolappears in the display. This is yourAT’s way of showing you that it wouldlike to adjust itself. You can now eitherinterrupt your work at the nextconvenient opportunity for about 5minutes, when the AT will adjust itself,or, you yourself can trigger themotorized adjustment by pressing akey.

- As soon as the horizontal dashesdisappear, the reference piecenumber and the reference weighthave been read in and your AT isready for counting or weighing.

If the automatic door function isswitched on, the draft shield opensautomatically on completion of theweighing-in process. If not, open ityourself.

Depending on how you have weighedin the reference weight, you can now:

- Count into the container withdisplay of the total number of piecesin the container or…

- …count out of the container withdisplay of the number of piecesremoved from the container.

+67 PCS

-24 PCS 0.3675

AUTOCALIN


47


If you have switched off the automaticself-adjustment, you should adjust thebalance occasionally.

Automatic adjustment with theinternal adjustment weights at akeystroke

You have this adjustment mode avail-able if you have set the parameter“adjustment and linearization” in sector2 of the configuration register (basicsettings) either to CALIN Auto on orCALIN Auto oFF.

- Repeatedly press the «Menu» keybriefly until the adjacent displayappears.

You select the adjustment mode insector 2 (SCALE) of the configurationregister (see Section 4.4). In addition tothe fully automatic self-adjustment ,you have two further adjustmentpossibilities available:

- You trigger the automaticadjustment with the internaladjustment weights, withsimultaneous automatic linearizationof the measuring range at akeystroke.

- The manual adjustment with anexternal adjustment weight,without linearization of the measur-ing range.

CAL Int

AUTOCALIN

Auto off

CALIN

USEr

CAL


48


⇔

⇔

Manual adjustment with externaladjustment weight

You wish to use your own externaladjustment weight for the adjustmentand have set the parameter proFACT(adjustment and linearization) to «CALUSEr» in sector 2 of the configurationregister (basic settings). In this modethe automatic adjustment andlinearization with the built-inadjustment weights is switched off.


- Trigger the adjustment procedure bypressing the «Set» key. The draftshield now closes automatically ifthe automatic door function isswitched in. If not, close the draftshield manually or by pressing oneof the two keys.

- Trigger the adjustment procedure bypressing the «Set» key. The draftshield now closes automatically ifthe automatic door function isswitched on. If not, close the draftshield manually or by pressing oneof the two keys.

- You can follow the adjustment andlinearization procedure in thenumerical display and on theDeltaTrac®, and you also hearwhen the internal weights areloaded.

Completion of the adjustment andlinearization process is displayedbriefly,…

…the audio warning beep sounds andthe balance returns to the weighingmode.

CAL End

0.0000

CAL USEr

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg


49


5.5 How to check whetherthe balance is stilladjusted correctly

In the factory, the balance is set toproFACT, professional fully automaticadjustment and linearizationtechnology. A check of the adjustmentis not necessary in this mode. If youhave selected the automaticadjustment mode with manualtriggering (CALIN Auto oFF) in sector 2of the configuration register (seeSection 4.4), it is advisable to check theadjustment with the internal adjustmentweights occasionally.

- Select the menu by pressing brieflythe «Menu» key.

After a short time, the audio warningbeep sounds and the requested,model-dependent adjustment weightappears in the display, for example,200 g.

- Open the draft shield, load therequested adjustment weight andclose the draft shield.

- Wait until the audio warning beepsounds. The display now requeststhe removal of the adjustmentweight.

- Open the draft shield, remove theadjustment weight and close thedraft shield.

As soon as the audio warning beepsounds and the adjacent displayappears, the adjustment is finished andyour AT is again in the weighing mode.

200.0000

CALIN

0.0000

CALIN

0.0000

Set

Cancel

Configuration

Menu

Select 1

⇔


0.1/0.01mg


50


⇔

The internal weights are now loaded,without the balance being adjusted,and the current, model-dependentadjustment value displayed, interruptedby the display tESt.

- When you have read off the value,abort the test by pressing the «Set»or «Cancel» key. The balance isthen again in the weighing mode.

Notes:If the deviation of the adjustmentweight is more than ±0.00015% (1.5ppm) from the full load, the balanceshould be adjusted (see Section 5.4).

If you work with your own, externaladjustment weight (parameter“adjustment and linearization” set toCAL USEr in the configuration register),you can check the adjustment of thebalance by loading your own, externaladjustment weights.


Note:This display does not appear if youhave set the parameter “adjustmentand linearization” to CAL USEr inthe configuration register(adjustment with your own externaladjustment weight). Please also seethe note at the end of this section.

- Select the adjustment test by press-ing the «Select 1» key.

- Start the test by pressing the «Set»key. If the fully automatic doorfunction is switched on, the draftshield now closes automatically. Ifnot, you first close the draft shieldmanually or by pressing one of thetwo keys and then the «Set» key.

CAL Int

AUTOCALIN

CAL tESt

199.9999

0.0000


51


- As soon as the result is stable, it istransferred via the interfaceconnection 19 to the printer. Up tothe transmission, the trianglesymbol is lit up in the display. If thetransmission has not yet takenplace, you can abort the procedureby pressing the «Print» key againbriefly.After the transmission, the result iskept for about 5 seconds in thedisplay for checking purposes, anda ring symbol flashes at the upperright.

- Notes:The type of transmission dependson the selected data transmissionmode, which you have set in thefourth sector of the configurationregister (see Section 4.6). If youhave selected the S.Stb or S.Automode and the automatic doorfunction is switched on, the draftshield is closed, the result transmit-ted and then the draft shield openedagain. If not, you close the draftshield manually or by pressing one

68.4325

68.4325 g

5.6 How to print outthe weighing result

You can output the weighing result viathe interface connection 19 on a print-er. If you wish to attach a non-METTLER TOLEDO printer, you matchthe para-meters of the data interface tothe specifications in the printerhandbook (see Section 4.6). You willfind further details in the instructions“Bidirectional interface of theMETTLER TOLEDO AT balances”,which you can order fromMETTLER TOLEDO.

- In the weighing mode press the«Print» key briefly.

On/Off

Print

Select 2

METTLER TOLEDO

⇔


52


⇔of the two keys.

- The transmission command canalso be triggered with the hand orfoot switch (available as an acces-sory).

5.7 Your AT can also beremote controlled

The complete operation (keypad anddraft shield) as well as the menu andthe configuration register of your ATbalance can also be controlled via acomputer. This allows you to incorpo-rate your AT in an automation systemand, for instance, is also suitable forloading by a robot.

The draft shield, the zeroing (taring) ofthe balance and the print command canalso be controlled externally via anelectrical contact (relay, proximityswitch). The connections for the electri-cal contacts 18 are at the rear of yourAT balance.

Further information regarding theconnection of an external robot or anelectrical contact can be found in theoperating instructions “Bidirectionaldata interface of the AT balances ”.


53


6 Important information regarding yourAT balance

6.1 The AC adapter offersyou various installationoptions

You can naturally place the AC adaptersupplied anywhere in the vicinity of thebalance within the radius of the con-nection cable. But in addition, the ACadapter also offers you two advan-tageous and space-saving installationpossibilities.

Direct attachment to the balance

You can attach the AC adapter directlyto your AT balance.

Note:Owing to the heat developed by the ACadapter, this type of installation is notadvisable with semimicro balances(resolution 0.01 mg).

- Remove the two fastener screws atthe rear of your AT balance.

- Attach the AC adapter holdersupplied to the rear of the balancewith the two screws. The arrow onthe holder must be visible and pointupwards.


54


- Connect the AC adapter first toconnection socket 23 of the balanceand then to the power supply.

Wall mounting

- If you wish to save space at theworkplace, you can mount the ACadapter on the wall:

- Decide on a suitable place for theAC adapter. Take the length of theconnection cable into account.

- Use the AC adapter holder as atemplate to mark out the drill holes.

- Position the four feet in the slots ofthe AC adapter. Hold the connectioncable to the right and it slides intothe central slot of the holder auto-matically.

Note:You can attach the AC adapter suchthat the power cable exits at theright.

- Press the AC adapter gently down-ward the stop.


55


- Press the AC adapter gently down-ward to the stop.

- Connect the AC adapter first toconnection socket 23 and then withthe power supply.

6.2 If you change the loca-tion of your AT

If you wish to relocate your AT, pleasenote the following:

- To transport your balance, grasp itat the front beneath the display andat the back under the balancehousing. Never lift up your AT bythe draft shield or by using the «Re-Zero» key!

- Drill the holes and use the dowels inthe installation set supplied shouldthe wall material require it. Fix theAC adapter holder such that thearrow is visible and pointing upward.

- Hold the unit so that the connectioncable exits from the top and posi-tion the four feet in the slots in theholder. Hold the connection cable tothe right while doing so and it willslide into the central slot of theholder automatically.

Note:You can also fix the AC adapter sothat the connection cable exits frombelow. In this case hold the connec-tion cable to the left when engagingthe AC adapter.


56


⇔

6.3 A well maintainedbalance is a joy forever

- Clean the weighing pan, the draftshield and the housing of your AToccasionally with the brush sup-plied.

If, for example, you wish to cleanthe base inside the draft shield atthe left, start with the brush fromthe right or from the top throughthe weighing chamber and at thesame time open the left door withthe left hand. Residues that haveaccumulated on the base can easilybe brushed out.With the AT20 you open the draftshield by pressing either the left orright key.

- For a thorough cleaning, lift off theweighing pan 15 and the draft cover16 vertically upward. After cleaning,replace the weighing pan and thedraft cover. When replacing theweighing pan, ensure that it has freemovement in its slot and does not

touch the draft cover. If necessary,turn the weighing pan to the correctposition.

CleaningThe balance housing and the weighingpan are made of high-grade, resistantmaterials. You can thus use anycommercially available cleaning agentfor cleaning.

- AT balances can best be cleanedwith a damp cloth.

Cautionary noteEnsure that no liquid can enter the ACadapter or the balance.


57


6.4 What your AT brings withit

The following accessories are suppliedwith your AT:

- AC adapter with holder and installa-tion set

- Operating instructions

- Short-form operating instructions

- “Weighing the right way”

- Cleaning brush

- METTLER TOLEDO weighingtweezers (for semimicro balancesonly)

6.5 Additional informationand accessories for yourAT balance

For below-the-balance weighingsyour AT is equipped with an openingfor a hanger. Open the draft shield andplace the balance on its back. Swingthe cover of the opening on the under-side of the balance aside. You can nowattach a pan or a holder to the hook inthe opening.

For the expansion of your AT balance,for special applications and for differenttypes of weighing problems a variety ofperipheral units and informationbrochures are available fromMETTLER TOLEDO.


58


7 Any questions?

7.1 What happensif the weight displayis unstable?

Since it is not always easy to determinethe exact cause of an unstable displaythe most frequent sources of error arelisted below.

You will find detailed explanations inthe enclosed booklet “Weighing theright way”.

An unsuitable location

Strong drafts (e.g. from air conditioningsystems) or vibrations of the bench arefactors that can cause disturbances.

- Look for a suitable location, adaptthe vibration adapter to the localconditions (see Section 3.3) andclose the draft shield as fully aspossible (see Section 2.1).

An insufficiently closed draft shield

- Close the draft shield as fully aspossible (see Section 2.1).

Electrostatic charging of weighingsamples and containers

This charging frequently appears inheated rooms with dry air (below 40-45% rel. humidity) and with weighingsamples made of glass or plastic. Theelectrical charges generate forces thatcan disturb the weighing.


59


- In the simplest case, it may besufficient to remove the draft cover16 and place the weighing samplein a metal container.

Magnetic weighing samples orcontainers

- In simple cases, it may be sufficientto increase the distance betweenthe weighing sample and theweighing pan. For this, place theweighing sample on a nonmagneticmetallic (e.g. aluminum) or glassvessel. A further improvement canbe achieved by removing the draftcover 16.

Weighing samples or containersthat are not at ambient temperature

Weighing samples or containers thatare warmer or colder than the ambienttemperature of the balance can causedisturbing air currents and buoyancyerrors. Weight changes due to theuptake or evolution of surface moisturecan also be the cause. These lead towrong or unstable weighing results.

- Wait until the weighing sample andthe container have attained theambient temperature. Do not touchthe weighing sample or the contai-ner with your hand (about 35 °C),but use only the tongs or thetweezers.


60


Weighing samples or containers thatabsorb or evolve moisture readily

All weighing samples or containersmade of wood, cardboard, paper,cork (e.g. holder for round-bottomedflasks), plastic or rubber can absorbor evolve enough moisture to make thedisplay unstable and cause display ofnonreproducible or wrong weighingresults.

- If at all possible, containers made ofsuch material should be replaced bymetal or glass vessels. If this is notpossible, operations should at leastbe performed in a room with aconstant atmospheric humidity.

The weighing sample or the contai-ner touches the draft cover

- In such a case remove draft cover16.

The weighing pan is placed at anangle and touches the draft cover orthe base

- Turn the pan to the center position(see Section 6.3).

Contamination

Powder, liquid or other residues at theedge of the weighing pan or betweenthe weighing pan and the draft covercan lead to unstable displays if theweighing pan no longer has completelyunrestricted movement.

- Clean the weighing pan and thedraft cover (se Section 6.3).


61


The weighing process adapter isswitched off

If the weighing process adapter isswitched off, the weight display doesnot always achieve stability when thelocal conditions are unfavorable andmeasurements are performed in thesemimicro range.

- Use this setting of the weighingprocess adapter exclusively forapplications in which the dynamicsof the weighing process are of primeinterest (see Section 3.2).

7.2 How can the weighingspeed be increased?

The weighing speed or the stabilizationtime of your AT is influenced consider-ably by the following factors andsettings:

Vibration adapter

If the local conditions allow (see Sec-tion 3.3), you can shorten the stabiliza-tion time of your AT by setting themedium or small wave symbol of thevibration adapter. Changing the settingof the vibration adapter by one stepcauses your AT to react around a thirdfaster.

Readability

If your application allows, you shouldreduce the readout increments for thelast decimal place. The larger thereadout increments (e.g. steps of 5instead of 1), the more rapid the opera-tion of your AT balance (see Section4.4).


62


Automatic stability detection

Your AT achieves stability quicker ifyou reduce the stability detection. If youselect, for example, stage 1(ASD –1–)instead of stage 6 (ASD –6–), thebalance releases the weighing result asstable decidedly more quickly (seeSection 4.4).

Glass draft shield, Inner draft shield

Your AT operates faster if you openthe draft shield to load the balanceonly as much as necessary. So thatexcellent weighing results can also beachieved fast under difficult weighingconditions, you can also use an innerdraft shield. (Order number 210270).The disturbing effects of any incomingdrafts in the weighing chamber arethus lessened (see Section 2.1).

Always select the fastest setting in themenu or configuration register thatyour application allows. You cannaturally combine all measures andhence produce a marked increase inthe weighing speed of your AT.

7.3 What happens if…?

…the display remains completelyblank?

Possible causes are:

- no power line voltage

- power cable not connected

- wrong power line voltage

Check and if necessary rectify thespecified error sources. If the balancedoes not function after switching onwith the «On/Off» key, contactMETTLER TOLEDO service.


63


– AUTOCALIN –

68.4325 -OFF-AUTOCALIN

…during a weighing the audiowarning beep sounds and theadjacent symbol appears in thedisplay?

- If the fully automatic self-adjustmentis switched on (see Section 4.4),your AT shows that it wishes toadjust itself (AUTOCALIN =Auto matic Calibration andLinearisation). But there is no needfor you to interrupt your work for this.Your AT will wait until you have notworked with the balance for about 5minutes and will then adjust andlinearize itself. During this process,the symbol “AUTOCALIN” flashes.

You also have the possibility,however, to trigger the adjustmentimmediately with a keystroke. Yourmethod of procedure is described inSection 5.4. The symbol in thedisplay fades when adjustment isended.

…after connection to the powersupply the adjacent display ap-pears?

- You have disconnected your ATfrom the power supply withoutpreviously switching it off by liftingthe «On/Off» key,< or a poweroutage has interrupted the balanceoperation. After reconnection to thepower supply or when the power isrestored, the balance is not swit-ched to standby.

- Press the «On/Off» key to switchthe balance on again. An extendedinternal self-test is then run withdisplay of the model designationand the software version. All displaysegments light up briefly and yourAT is then ready for weighing again.


64


0.0000

…the display shows overload orunderload?

- Overload is displayed when theweight of the loaded weighingsample is larger than the weighingrange.

- Underload is displayed when theweighing range is not reached. Thisapplies when the weighing pan ismissing, or the weighing pan tou-ches the draft cover and no longerhas unrestricted movement. In thiscase switch the balance off, positionthe weighing pan correctly and thenswitch your AT on again.

…the display “0.0000” flashes?

Zero is not defined:- Place the weighing pan on the

balance.- Remove the load from the weighing

pan.

…the glass draft shield is somewhatdifficult to open in manual opera-tion?

- Free the motor coupling by gentlyjerking the draft shield slider backand forth.

…the graphic indicators suddenlydisappear?

- Depending on the setting in theconfiguration register, the graphicindicators are either displayedpermanently or only for a fewminutes after the balance has beenswitched on (see Section 4.5).


65


…the triangle symbol appears in thedisplay?

- You have pressed the «Print» key.Your AT signals that it is ready totransmit a released weighing result(stability indicator faded) via theinterface (e.g. to a printer).

…a flashing circle appears abovethe weight unit?

- If a weighing result has beentransmitted via the interface (withthe «Print» key), in fully automaticoperation the draft shield opensautomatically. So that you cancheck the result or if need be note itdown, the display remains “frozen”for 5 seconds, and this is indicatedby the flashing circle.

68.4325

68.4325 g

…the balance returns automaticallyfrom the menu or the configurationregister to the weighing mode?

- You have selected the menu or theconfiguration register and notpressed a key for 1 minute. Your ATthus assumes that you do not wishto make any changes and returns tothe weighing mode.

…no weighing results or nonsensi-cal characters are printed out on theattached printer?

- To ensure correct functioning of theattached printer, different settingshave to be made in the configura-tion register, including values for thedata transmission and the parity(see Section 4.6). Information regar-ding the correct settings can befound in the handbook of yourprinter.


66


- No reference weight has beenloaded.

- A wrong reference weight has beenloaded.

- The balance returns automatically tothe weighing mode.

The weight lies outside the tolerance

The following causes could be respon-sible:

- a wrong external adjustment weight.

- the weighing pan is loaded duringthe adjustment.

The adjustment procedure is abortedautomatically and the balance returnsto the weighing mode.

- You have started the adjustmenttest. A weighing sample is still onthe weighing pan. Remove it.

no rEF

Err rEF

Err LOAd

bAd LOAd

7.4 What does this errormessage mean?

- Error messages in the display drawyour attention to faulty operation,namely that the balance was notable to perform a procedure proper-ly. Error messages are supported byan audio signal (“twitter”).

Wrong or missing reference weight

- If one of the application units per-cent (%) or piece (Stk or PCS) hasbeen selected as weight unit 2, thebalance must have a referenceweight available. The followingerrors can appear:


67


Err. unStb

Err tiNE

Fault in the adjustment

- The adjustment procedure of thebalance has been disturbed.

- The adjustment is automaticallyaborted and the balance returns tothe weighing mode.

The wait time of 1 minute has runout

This could have the following causes:

- You have set the automatic stabilitydetection (ASD) at a too high stage.After pressing the «Print», «Re-Zero» or «Set» key (with %, Stk orPCS), stability is not reached within1 minute.

- The weight for the externaladjustment has not been loaded.

- A wrong weight has been loaded.

The corresponding procedure is abor-ted automatically and the balancereturns to the weighing mode.

7.5 What does this termmean?

We have “translated” the most impor-tant technical terms for you. Referen-ces (in italics) show you the section(s)in which you can find further informa-tion.

AdjustmentMatching the balance to a referenceweight. Adjustment, see also proFACT.Sections 4.4, 5.4 and 5.5

Adjustment testTest function which can be called up inthe menu to allow checking of theadjustment without adjustment actuallybeing performed.Section 5.5

CAL tESt


68


Automatic door functionAutomatic opening and closing mecha-nism for the glass draft shield thatensures that the balance and the draftshield are always in the correct positionfor the next weighing step.Section 3.4

Automatic stability detectionContinuous automatic check of theweight value for stability. The weightdisplay is considered stable when itschange with time lies within a presetlimit. Different stages can be configuredby the user and correspond to variouslimits. The stability of the display isattained when the stability detectionsymbol in the upper left corner of thedisplay fades.Also with Re-Zero (taring) the display isset to zero only when stability has beenachieved.Section 4.4

Ambient conditionsLocal conditions at the location of thebalance. The following local conditionscan lead to display errors duringweighing: unsuitable location, changesin the temperature, atmospheric humi-dity or the atmospheric pressure,magnetic fields, electrostatic forces,vibrations, drafts caused by airconditioning.Section 7.1

Analytical balanceBalance with a readability of 1 d(1 digit) = 0.1 mg.

Analytical rangeWeighing range with a readability of 1 d(1 digit) = 0.1 mg.Section 2.4

Application unitUnit selectable in the configurationregister that is used for applications inwhich not only the weight, but also aquantity derived from it (piece, percent)is determined and displayed.Sections 4.5, 5.2 and 5.3


69


ConfigurationThe sum total of all settings selectedfor the parameters in the configurationregister.Section 4

Configuration registerRegister with tree-like structure inwhich operational settings, weight unitsand much more can be matched to theneeds of the user. The configurationregister can be protected againstinadvertent changes with the aid of thejumper.Section 4 and pages 82 and 83

ConfiguringChanging the settings in the configura-tion register.Section 4

AutozeroAutomatically corrects the zero displayif drifting occurs or the weighing pan iscontaminated.Section 4.4

Baud rateSee “Data transmission rate”.

Bit (Binary digit)Unit used for the information content ofa communication.Section 4.6

Coarse rangeNormal weighing range with ten timesless resolution than the fine range. Seealso “Dual-range balances” (semimicrobalances) and “DeltaRange®balances”.Sections 2.3 and 2.4


70


Data transmission rateSpecifies the rate at which the data aretransferred. Also called baud rate: 1baud = 1 bd = 1 bit/second.Section 4.6

DeltaRange® balanceBalance with a fine range recallable atany time over the entire weighingrange.Section 2.4

DeltaTrac®Dynamic graphic indicator with 60radial indicators. Displays the used andremaining weighing range. Graphiccomplement to the alphanumericdisplay; also suitable for use as aweighing-in aid.Sections 2.2 and 5.2

Differential weighingDetermination of the weight of a sam-ple before and after a weight change.

DigitDisplay unit; a digit corresponds to adisplay increment of the last decimalplace.

- 1 digit = 1d = 0.1 mg in the analyti-cal range

- 1 digit = 1d = 0.01 mg in the semi-micro range

See also “Readability”Section 5.5

DispensingFine weighing in of powder or smallquantities of liquid.Section 3.2

DisplayUsed for communication betweenbalance and user. Shows weighingresults, setting options, etc.Front fold-out


71


Door drive handleDevice which allows motorized openingof the draft shield.Section 2.1

Factory settingSettings preselected by the manufactu-rer in the menu or configuration registerfor normal applications and ambientconditions. Characterized in the confi-guration register by an asterisk in theupper left corner of the display. Can bechanged by the user, but also reset atany time.Sections 3 and 4

Fine rangeSection of the entire weighing rangewith a ten times greater accuracy, seealso “Dual-range balances” (semimicrobalances) and “DeltaRange®balances”.Sections 2.3 and 2.4

Foot switchAvailable as an accessory in single ortwin versions. Control element forzeroing (taring) the display, for trigger-ing the data transmission («Print» key)and for operation of the automatic doorfunction of the draft shield. Frees bothhands for operations.

HandshakeSpecial control lines or data signals forsynchronization of the data flow via theserial interface (feedback betweensender and transmitter).Section 4.6

InterfaceConnector with standardized datatransfer between the balance andanother component of the system(printer, computer).Section 4.6


72


JumperSafety device in the program cassette.Rearrangement of contacts blocks theconfiguration register and thus protectsthe stored settings against inadvertentchange.Section 4.8

LCDLiquid Crystal Display. Display whichdoes not itself light up but reflects theambient light.Front fold-out

LevelDevice which facilitates the horizontalalignment of the balance. Operates onthe principle of a spirit level with an airbubble in a liquid. See also “Leveling”.Section 1.2

LevelingHorizontal aligning of the balance.Should be performed before startup.Section 1.2

LinearizationAdjustment of the balancecharacteristic curve. To establish theproportionality between the loadedweight and the display. Performed bythe AT for every adjustment in the fullyautomatic self-adjustment and in theautomatic adjustment with the built-inadjustment weight.Section 4.4

MenuA menu is generally understood tomean a series of selections which theuser can match to his needs. In themenu of the AT the user can match thebalance to the ambient conditions,adjust the balance and undertake otheradjustments.Section 3 and pages 82 and 83

Overload/underload displaySignals the overloading or underloa-ding of the balance through illuminationof the horizontal segments in thedisplay.Section 7.3


73


ParameterPart of a sector in the configurationregister. Each of the four sectors of theAT contains parameters (e.g. automaticstability detector, readability, etc.).Section 4 and pages 82 and 83

ParityChecking information in the datatransmission.Section 4.6

Percent weighingApplication for the weighing in to apreset reference value (= 100%) andwith the possibility to display thedeviation in percent.Section 5.2

Piece countingWeighing application for the determina-tion and display of the piece count ofweighing samples of equal weight.Section 5.3

proFACTFully automatic adjustment andlinearization with two internal weightswhen necessitated by the operatingconditions. proFACT: professional FullyAutomatic Calibration Technology.Section 4.4

Program cassetteCassette with stored microcomputerprogram needed by the balance for itsfunctioning.Section 4.8

ReadabilitySmallest, still distinguishable displaydifference = 1 d (1 digit); forMETTLER TOLEDO analyticalbalances 1d = 0.1 mg.Section 4.4


74


Reference weightRepresentative reference weight.Needed among other things for theperformance of percent weighings andpiece counting.

- In percent weighings. Referenceweight = 100%

- In piece counting: Reference weight= weight of the reference piecenumber

Sections 5.2 and 5.3

RepeatabilityConsistency of the weighing result inseveral repetitions on the same balan-ce with the same weighing sample andunder identical weighing conditions. Itis unnecessary that each individualweighing lies within the limits; rather astatistical function is involved. Therepeatability is usually expressed asthe standard deviation s of 10weighings.

Resolution (resolving power) of abalanceSee “Readability”

Re-ZeroInternational designation for the zeroingof the display and for the zeroing key.Also used for zero setting, taring andthe tare bar, although the definitionsare not identical.Section 1.3

SectorPart of the configuration register. Theconfiguration register of the AT compri-ses four sectors, each of which con-tains various parameters.Section 4 and pages 82 and 83

SegmentThe smallest part of a display. Thedisplay of a letter or a number compri-ses several segments.Front fold-out


75


Self-testAfter connection to the power supply,the balance automatically performs atest of its functions.Section 1.3

Semimicro balance (semimicroanalytical balance)Balance with a readability of 1 d(1 digit) = 0.01 mg = 0.00001 g.

Semimicro rangeFine range in dual-range balances witha resolution of 0.01 mg.

Stability detectionSee “Automatic stability detection”.

Stabilization timeAlso known as weighing speed. It isdefined as the time between the load-ing of the weighing sample on theweighing pan and the attainment ofstability of the weight display (see also“Automatic stability detection”). Thestabilization time can be matched tospecial needs with the vibration adapterbeing the most important influencingfactor.Sections 3.3, 4.4 and 7.2

StandbyWait condition. Balance is in operatio-nal readiness (connected to the powersupply via the AC adapter), but notswitched on, i.e. the display is dark,only the standby symbol is lit up.Section 1.3


76


VFDVacuum Fluorescence Display. Self-illuminating display that is not depen-dent on the ambient lighting.Front fold-out

Vibration adapterPossibility to adapt the balance to thelocal conditions prevailing at the weigh-ing station. Set in the menu in the caseof the AT.Section 3.3

Wait conditionSee “Standby”.

Weighing-in aidSee “DeltaTrac®”.

Weighing modeYour balance is ready for weighingoperations, i.e. it will display the weigh-ing result and is not in the menu, theconfiguration register or the standbystate.

Status indicatorsSymbols that show the most importantsettings (vibration adapter, weighingprocess adapter). The symbols can bedisplayed permanently or for just a fewminutes after switching on the balance.Section 4.5

Tare weightWeight of a container, vessel or thepacking that should not be taken intoaccount in the weighing.Section 1.3

Target weightSee “Reference weight”.

TaringCompensation of tare weights, i.e.setting the display of the balance withloaded tare weight to zero. Often calledzeroing, zero setting or re-zero. Seealso “Re-zero”.Section 1.3


77


Weighing process adapterPossibility to adapt the balance tospecial types of weighing; set in themenu.Section 3.2

Weighing speedSee “Stabilization time”.

Weight unitUnit (e.g. g, mg, oz, etc.) that can beselected in the configuration register.Section 4.5

ZeroingSee “Taring” and “Re-Zero”.


78


7.6 How are weight units converted?

The following table will facilitate the conversion between the weight units available for the AT.

Gram Milligram Carat Ounce Troy Ounce Pennyweightg mg ct/C.M. oz ozt dwt

(metr.) (avdp)koil

1 g = 1 1000 5 0.03527396 0.03215075 0.6430149

1 mg = 0.001 1 0.005 0.0000352740 0.0000321508 0.000643015

1 ct/C.M. = 0.2 200 1 0.007054792 0.006430150 0.1286030

1 oz = 28.34952 28349.52 141.7476 1 0.9114585 18.22917

1 ozt = 31.10347 31103.47 155.5174 1.097143 1 20

1 dwt = 1.555174 1555.174 7.775869 0.05485714 0.05 1

1 GN = 0.06479891 64.79891 0.3239946 0.002285714 0.002083333 0.041666667

1 tl (HK) = 37.429 37429 187.1450 1.320269 1.203370 24.06741

1 tl (SGP/Mal) = 37.79937 37799.37 188.9968 1.333333 1.215278 24.30556

1 tl (Taiwan) = 37.5 37500 187.5 1.322774 1.205653 24.11306

1 mo = 3.75 3750 18.75 0.1322774 0.1205653 2.411306


79


Grain Tael Tael Tael MommeGN tl tl tl mo

(Hongkong) (Singapur) (Taiwan)(Malaysia)

1 g = 15.43236 0.02671725 0.02645547 0.02666667 0.2666667

1 mg = 0.01543236 0.0000267173 0.0000264555 0.0000266667 0.000266667

1 ct/C.M. = 3.086472 0.005343450 0.005291094 0.005333333 0.05333333

1 oz = 437.5 0.7574213 0.7500000007 0.7559874 7.559873

1 ozt = 480 0.8309993 0.8228570 0.8294261 8.294260

1 dwt = 24 0.04154997 0.04114285 0.04147131 0.4147130

1 GN = 1 0.001731249 0.001714286 0.001727971 0.01727971

1 tl (HK) = 577.6178 1 0.9902018 0.9981068 9.981068

1 tl (SGP/Mal) = 583.3334 1.009895 1 1.007983 10.07983

1 tl (Taiwan) = 578.7134 1.001897 0.9920800 1 10

1 mo = 57.87134 0.1001897 0.09920800 0.1 1


80


7.7 Where will I find detailsof…?

The following index shows you thepage number of these instructions onwhich you will find the informationappropriate to a particular theme. Thepage numbers in bold print refer to themost important information for thespecific search word.

Absolute weighing 18AC adapter 4, 53Accessories 57Adjustment 30, 46, 48, 66, 67Adjustment mode 31, 47, 49Adjustment weight 49Adjustment test 50Application unit 33, 68Applications 41, 43Automatic door function 20, 68Automatic door operation 20Automatic stability detection 27, 68Autozero 29, 69

Beeper setting 34Below-the-balance weighing 57

Cleaning 56Configuration register 22, 69

Data interface 35DeltaTrac® 11, 42, 48DeltaRange® balance 11Dispensing 18Draft shield 8Drop symbol 17

Electrostatic charging 58Error message 66External adjustment weight 31, 48

Factory setting 27, 71Fine dispensing 18Fine range 11, 71

Glass draft shield 8

Interface 35, 71

Jumper 39

Linearization 30, 47, 72


81


Magnetic weighing samplesor containers 59Manual adjustment 47, 48Menu 14

Operational setting 22, 26Overload 64

Percent 41Percent weighing 41, 73Piece counting 21, 43, 73Power outage 8, 63Printer 38, 51proFACT 30, 46, 73Program cassette 39, 73

Readout increment 28Reference weight 41, 45, 74Repeatability 28, 74Resolution 11, 74Re-Zero 74

Self-adjustment, fully automatic 31, 46Self-test 5, 8, 75Semimicro balance 12, 75Setting options 14, 22Stability detection 27, 68, 75Stabilization time 61, 75Standby 7, 75Status indicators 34, 76Switching off the balance 7, 63

Taring 5, 76

Underload 64Unstable display 20, 58

Vibration adapter 19, 76Vibrations 19

Wait condition 76Wave symbol 19Weighing in 18Weighing mode 5, 76Weighing process adapter 17, 77Weighing speed 28, 61, 76, 77Weight unit 32, 33, 40, 77


82

Return tofactory setting

rESET

Weight units

Unit

Weighing mode

100 10

50 20

Automatic stabilitydetection

ASd

9600 150

4800 300

2400 600

1200

Cont Stb

Auto ALL

Datatransmission mode

S.

*

* *

press and hold key

Interface

Int-FACE

Datatransmission rate

bd

Operationalsetting

SEttINGS

Basic settings

SCALE

mo g

CM mg

ct oz

dwt ozt

GN tI

Menu Configurations register

Internaladjustment

CAL

External 3)adjustment

CAL USEr

Set reference 1)weight for %

SEt 100 %

Set reference 1)weight for piece

SEt Stk

Readability 5)

d

*

*

oFF -1-

-7- -2-

-6- -3-

-5- -4-

Weight unit 2

Unit 2

tESt Int2)

Weight unit 1

Unit 1

d 0.1 mg

d 0.5 mg d 0.2 mg

/ / / / /J

JJ

JJ

J

J

J

J

J

J

JJ

J

J

J J

J

J

J

d 1 mg


Menu Configuration register

Selection of the menu Selection of theSelection of the menu options configuration register

Selection of the sectors

Selection of the settings Selection of the parameters

Cancellation of the changes Selection of the settingsand return to the weighing mode

Storage of the current menu Cancellation of the changesand return to the weighing mode and return to the weighing mode

Switching off the balance by Storage of the current configurationpressing key upward and return to the weighing mode

Menu Configuration

Select 1 Select 1

CancelSelect 2

Cancel

Set

Parity

PAr

Transmissionprotocol

H5

End-of-linemode

EOL

*

*

cr crLF

SPc -E-

oFF -O-

PAUSE CL

Soft oFF

HArd

*

*

*

Set weighingprocess adapter

Set vibrationadapter

—

Std Auto

fully automaticdoor function

door Auto

– —

_

Beeper setting

bEEP

*oFF on

Autozero

*oFF on

USEr Auto on

Auto oFF

Readability 4)semimicro range 5)

dF

Status indicators

- ,

*

% g

Stk mg

PCS oz

mo ozt

CM tI

ct GN

dwt

on Auto

*

*

*

*

proFACT (Adjustmentand linearization)

CALIN

dF 0.1 mg dF 0.01mg

dF 0.05mg dF 0.02mg

AZ

J

J

JJ

J

J

J

J

J

J

J

J

J

J

JJ

J

J

J

J

J

JJ

1) Appears only if weight unit 2 is set in the configuration register topercent (%) or piece (Stk or PCS).

2) Appears only if the internal adjustment (Auto Off ) is set in theconfiguration register.

3) Appears only if the external adjustment (USEr ) is set in theconfiguration register.

4) Appears only with semimicro and DeltaRangeR balances.

5) The following appears with the AT20:d = 0.01 mg*, 0.02 mg, 0.05 mg, 0.1 mg / dF = 2 µg*, 5 µg, 10 µg

The following appears with the AT460 DeltaRange®:d = 1 mg*, 2 mg, 5 mg, 10 mg / dF = 0.1 mg*, 0.2 mg, 0.5 mg, 1 mg

* Factory setting

Set

Set


84


Modell AT21 AT20 AT201 AT261 DeltaRange® AT200 AT400 AT460 DeltaRange®Comparator 60g DeltaRange® 200g 60g DeltaRange® 400g

Readability 1 µg 2 µg 0.01 mg 0.01 mg 0.1 mg 0.1 mg 0.1 mg 0.1 mg 1 mgWeighing capacity 22 g 22 g 205 g 62 g 205 g 205 g 405 g 62 g 405 gTaring range (by subtraction) 0…22 g 0…22 g 0…205 g 0…205 g 0…205 g 0…205 g 0…405 g 0…405 g 0...405 g

Repeatability (s) full load 2 µg 4 µg 0.04 mg 0.04 mg 0.05 mg 0.07 mg 0.15 mg 0.15 mg 0.3 mgRepeatability (s) 0...50 g 0.015 mg 0.015 mg 0.04 mg 0.05 mg 0.05 mg

Linearity ± 6 µg ± 10 µg ± 0.12 mg ± 0.08 mg ± 0.15 mg ± 0.15 mg ± 0.5 mg ± 0.5 mg ± 1.4 mgLinearity within 500 mg 1) ± 4 µg ± 6 µgLinearity within 10 g 1) ± 0.03 mg ± 0.03 mg

Stabilization (typical) 14...18 s 10...14 s 10...14 s 8...12 s 3...5 s 3...5 s 4...6 s 4...6 s 3...5 s

Built-in adjustment weights 2x10 g 2x10 g 2x100 g 2x100 g 2x100 g 2x100 g 2x100 g

Adjustment proFACT Fully automatic motorized self-adjustment with two built-in weights.The accuracy of the adjustment depends on the geographic location and the height above sea level.

Adjustment with external weight: 20 g 20 g 200 g 200 g 200 g 400 g 400 g

Display with DeltaTrac® LCD (liquid crystal) VFD (Vakuumfluoreszenz)

Display sequence 0.2...0.4 s variable

Sensitivity: - Temperaturedrift 1) 2) ±1.5 ppm/°C- Long-term stability 3) with self-adjustment proFACT: ±1.5 ppm

Linearization Automatic self-linearization of the weighing curve (simultaneously with motorized adjustment proFACT)

Data interface CL and RS232C, bidirectional, built in as standard, all lines galvanically separated.

Glass draft shield No hindering guideways; automatic motorized opening or at a keystroke.

Inner draft shield Standard Accessory

Equipment designed test conditions P: 115 V or 230 V, admissible voltage fluctuation: -20% +15%, frequency 50/60 Hz, max. power consumption 15.5 W.Power supply (national codes) S: 12.8 V=, 6.5 V=, 10.8 V=, 16.7 V=

Pollution degree 2. Overvoltage category II.Temperature: 5...40 °C. max. relative atmospheric humidity: 80% for temperatures up to max. 31 °C linearly decreasing to 50% at 40 °C.Height: 6000 m. Use only indoors in closed rooms.

Weighing pan with feedthrough for ø 28 mm ø 32 mm 80x80 mm; stainless steelbelow-the-balance weighing suspended

Measures Free height above weighing pan 239 mm, Balance housing 241x433x289 mm (W x L x H), power supply 115x140x53 mm (W x L x H)Weight Balance 9.3 kg, AC adapter 1.2 kg

1): In the temperature range 10...30 °C 2): 1 ppm = 1/1'000'000 (relative to the current weight display) 3): Sensitivity deviation / year with self-adjustment proFACT switched on

Technical specifications(after a warm-up time of at least 120 min.)


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Documents

You~ Source for: Quality Newand Certified-Used/Pre ... › info › Mettler_AT261_Manual.pdf · 1 Operating instructions METTLER TOLEDO AT balances 1 The AT smooths the way 1.1 The