Quality control of liquid samplesEfficient and easy

Density measurement

Refractometry

Automation

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1 2

Efficient quality control of liquid samples

The efficient solution for the quality control of liquid samples

Quality control of liquid samples without the measurement of density and refractive index is difficult to imagine today. Digital instruments have helped to make the determination of these two param-eters much more important in routine quality assurance.High resolution instruments alone do not, however, guarantee accurate measurements because the results can still be influenced by the operator or by sample-related effects. METTLER TOLEDO mea-surement systems simplify the determination of density and refractive index and ensure that incor-rect measurements are either impossible or become immediately apparent.

Read in the dataSample identification and user name can be entered with the bar code reader. No keys to press!

Place the sampleThe sealed sample vials are not opened until just before the sample is measured. No evapo-ration or contamination of the sample is possible.

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3 41 23 4

Press the Measure keyOne single keystroke is enough to fully automatically determine the density, the refractive index, or both parameters. In doing so it also initiates sample delivery before and sample recovery after the measure-ment, as wells as thorough cleaning and drying of the system.

Read off the resultsThe measurement printout includes more than user names, results and sample data: the user is also informed if, for example, sample-or system-related problems oc-curred during the measurement.

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DR

Density meters and refractometers

Density and refractive index – simultaneously or one at a time

The days of manual determinations with pycnometers, hydrometers or optical Abbe refractometers belong to the past. The METTLER TOLEDO digital instruments determine density and refractive in-dex simply, with great accuracy and, depending on the instrument, even simultaneously. Automatic conversion of the results to user-defined units allows the instruments to be used for special applica-tions. The built-in Peltier thermostat ensures that the sample temperature is accurately controlled – no need for water baths.

Density and refractive indexOne measurement – two param-eters! The METTLER TOLEDO DR40/45 Combined Meters simplify something commonplace in many industries: The simultaneous determination of density and refractive index. Measuring both val-ues with the same instrument increases speed, simplifies procedures and en-hances the accuracy of the results.

In many industries (e.g. petrochemical or flavors and fragrances) the deter-mination of both values is already a standard method. In other industries, the simultaneous determination of density and refractive index is used to determine concentrations in multi-component mixtures. That’s no problem for the DR Combined Meters – besides the density and refractive index, they can also cal-culate up to two results from the density, the refractive index or from both results using formulas or concentration tables previously entered.

Instrument Limit of Error Temperature range

DR40 Density: 5 · 10-5 g/cm3

Refractive index nD: 1 · 10-4

15 … 50 °C

DR45 Density: 5 · 10-5 g/cm3

Refractive index nD: 5 · 10-5

15 … 50 °C

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DE

RERefractive index RE40D, RE50

The RE refractometers determine the refractive index using a method based on total reflection. Even turbid or dark samples can be measured with this technique. The instruments are practically maintenance-free, thanks to the latest technological developments – no moving parts, long-life LED light source and an inert sapphire prism. The accurate thermostating of samples with the built-in Peltier thermostat ensures reliable measurements. The results are displayed as refractive index, in Brix or in other user-defined units.

Instrument Limit of Error (nD) Temperature range

RE40D 1 · 10-4 (0.1 Brix) 15 … 70 °C

RE50 5 · 10-5 (0.03 Brix) 15 … 50 °C

Density DE40, DE45, DE51The DE density meters measure the resonance fre-quency of a special glass cell filled with sample. The density of the sample is calculated from this frequency and is displayed directly as density, specific gravity or in other units such as Brix, API degrees or alcohol concentration. The DE density meters are also suitable for the measurement of viscous samples because they automatically correct the influence of sample viscosity on the oscillation behavior of the cell.All DE density meters are supplied with 2 certified den-sity standards (water).

Instrument Limit of Error Temperature range

DE40 1 · 10-4 g/cm3 4 … 90 °C

DE45 5 · 10-5 g/cm3 4 … 90 °C

DE51 2 · 10-5 g/cm3 4 … 70 °C

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Simple access to unlimitedpossibilities

Concentration determinations without a pocket calculatorAll the DE/RE/DR models display the concentration of two-component mixtures directly – just enter the table. Each instrument can store up to 9 such concentration tables. If this is not enough, you can store additional tables on memory cards and load them as required. Relevant concentra-tion tables can be found at www.density.com and www.refractometry.com or in the literature.

Instrument check at the stroke of a keyAll instruments have to be adjusted from time to time. This can be dangerous – if an adjustment is not carried out properly, all subsequent measurements are wrong! This is why all the DE/RE/DR models have a Check function which allows you to easily check whether adjustment of the instrument is necessary. And if you want to be on the safe side, the time interval for the instrument test can be set. This guarantees that the measurement accuracy of the system is checked at regular intervals.

Password pleaseMeasurement methods and instrument settings can be protected with a password. This prevents unintentional or unauthorized changes of the instrument settings.

Temperature compensationMeasurement values can be determined at one temperature and auto-matically converted to another temperature. For temperature conversion, comprehensive temperature compensation functions are available.

Uniform user interface

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Data backup included1)

Measurement methods, data from adjustments and instrument checks as well as measurement results can be stored on memory cards. This, for example, allows measurement methods to be easily transferred from one instrument to another.

Official methodsThe DE45/DE51 density meters and the DR40/45 Combined Meters have built-in tables to convert density into sugar content in Brix (Table 109, NBS Circular 440), Alcohol content in Vol-% (Table N° 3, NBS Circular 19, OIML Table IVa) as well as for temperature compensation according to API (ASTM D 1250, Table 53A, 53B and 53D). The RE refractometers and the DR Combined Meters use an official table (ICUMSA) to convert refractive index to Brix, or HFCS421) or HFCS551) (Physi-cal Properties Table Corn Products, 1991).

Easy entry of sample dataWhen individual samples or series of samples are measured, the instrument has to be told what is to be measured (sample data), how the measurements are to be performed (methods) and who is operating the system (user name). The pos-sibility of entering sample files in dialog form or directly as a table, as well as the barcode reader, make the transfer of all necessary GLP data quick and easy.

Statistical evaluations as requiredStatistical evaluation of measurement values can be performed as desired when the measurements are completed (stored results) or automatically after each measurement.

Efficient exchange of dataAll the DE/RE/DR models have three serial interfaces for the connection of a printer, bar code reader and a computer. The DataCapture software allows mea-sured values to be acquired in the PC either directly into Microsoft EXCEL tables or as ASCII text files.

Upgradable1)

On request, we can supply you with concentration tables in the form of memory cards containing up to 200 pairs of data for special applications. Your local METTLER TOLEDO representative will be happy to help you.

1) not available with the refractometer RE40D

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Automation

SC

Highly reliable with minimal effort

The SC1 and SC30 sample delivery and cleaning units reduce the work involved in the determination of density, refractive index, or both.The sample delivery and cleaning units are not only the best guarantee for a fast payback, they also help to prevent measurement errors and to save cleaning solutions.

SC1 and SC30. The decisive step from measurement instrument to measurement system.

Automatic sampling. The instru-ment itself detects when the cell is filled with sample and automati-cally switches off the pump.

Reliable sampling. Samples are delivered to the cell under pres-sure and not, as often the case in other systems, under suction. The advantage of this technique is that no errors occur with samples that tend to degas (no formation of air bubbles). Furthermore the systems are suitable to measure samples with a viscosity of up to 30’000 mPa·s.

Sample carryover eliminated. The inside and outside of the sampling nozzle is thoroughly cleaned and dried after every measurement.

Automatic error detection. With the SC1 and SC30 sample de-livery and cleaning units, the DE density meters, RE refractometers and the DR Combined Meters are able to automatically detect the most frequent sources of error in density and refractive index mea-surements (such as air bubbles, inhomogeneous samples or sol-vent residues) and to warn the user accordingly.

Changes in the sample are not possible. The sealed sample vials are only opened just before the actual measurement. No evapora-tion or contamination of the sample is possible.

Efficient cleaning. After the mea-surement, the system is rinsed with two solvents. The first solvent is to remove the sample; the second is a solvent of high vapor pressure

to dry the system completely. Both solvents are mixed with air and pumped through the system at high speed. The resulting pulsed flow provides a very efficient me-chanical cleaning.

Special applications – no problem at all! The SC1 and SC30 sample delivery and cleaning units can return the samples back into the vial after the measurement. The samples may thus be used for other purposes after the determination of the density and/or refractive index.

In cases where the density of samples which are very highly viscous or even solid at ambient temperature have to measured, the SC1 and SC30 may be equipped with electrical heating.

SC1 SC30

Pump mode overpressure overpressure

Number of samples 1 (20, 9 or 6 mL) 30 (20, 9 or 6 mL)

Maximum sample viscosity 30’000 mPa·s 30’000 mPa·s

Minimum sample volume 3 mL for DE/RE, 6 mL for DR 3 mL for DE/RE, 6 mL for DR

Sample vial detection - automatic

Rinsing automatic, 2 solvents automatic, 2 solvents

Drying automatic automatic

Sample recovery automatic automatic

Automatic switching off - programmable

Temperature control electrical heating (option) electrical heating (option)

Technical Data SC1/SC30

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SC30: Sample delivery and cleaning unit for the measurement sample series. On the right: SC30 with Heating Option.

SC1: Sample delivery and cleaning unit for the measurement of individual samples. On the right: SC1 with Heating Option.

SC-RE connection kit (required for connection of RE refractometers)

ME-51322068 Scored foam seals for sample vials 20 mL(200 pcs.)

ME-51322299

Sampling needle made of Hastelloy C22 (to measure highly aggressive samples)

ME-51327323 Sample vials 9 mL(1’860 pcs.)

ME-51322312

Electrical heating (heating option) for SC1 ME-51326301 Sample vials 6 mL (1’860 pcs.) ME-51322313

Electrical heating (heating option) for SC30 ME-51327300 Adapter for small sample vials (30 pcs.)1) ME-51322304

Sample vials 20 mL (148 pcs., vials, only) ME-51322310 Seals for small sample vials (2’000 pcs.)1) ME-51322305

Screw caps with hole for sample vials 20 mL (148 pcs.)

ME-51322311 Screw caps for small sample vials (3’500 pcs.)

ME-51322306

1) required for 6 and 9 mL sample vials

Accessories SC1/SC30

1011

ASU-DE Drying unit

2)

1)

3)

1)

Measurement systems

DA-100MThe DA-100M is a three-decimal density meter for manual measurement of individual sam-ples. This density meter has a built-in Peltier thermostat and an air pump to dry the measur-ing cell before performing adjustments. The results are displayed as density (in g/cm3), as specific gravity or as concentration (linear equation programmable). The DA-100M can be equipped with an ASU-100 automatic sampling unit (option).

ASU-DEThe ASU-DE pump for automatic sample delivery by suction can be installed di-rectly in DE density meters. It is suitable for the manual measurement of individ-ual samples with a maximum viscosity of 600 mPa·s.

Drying unitAir pump to dry the measuring cell prior to ad-justments. All the DE density meters which are used without any automation unit (ASU-DE, SC1 or SC30) must be equipped with a drying unit.

Systems / Technical data

1) Cable ME-51190362 required2) For DE/RE: ME-51324100 For DR: ME-513241023) Connection kit ME-51322068

required4) Only suitable to be used with DE

Density Meter

– Heating Option 4)

– Heating Option 4)

1011

Technical data

Refractive index

Density

RE40D RE50 DR40 DR45 DE40 DE45 DE51 DA-100M

Measurement range density [g/cm3]

- - 0…3 0…3 0…3 0…3 0…3 0…3

Limit of error density [g/cm3] - - 5 · 10-5 5 · 10-5 1 · 10-4 5 · 10-5 2 · 10-5 1 · 10-3

Measurement rangerefractive index nD

1.32…1.70 1.32…1.58 1.32…1.70 1.32…1.58 - - - -

Limit of errorrefractive index nD

1 · 10-4 5 · 10-5 1 · 10-4 5 · 10-5 - - - -

Measurement range Brix [%] (based on nD)

0…100 0…100 0…100 0…100 - - - -

Limit of error Brix [%](based on nD)

0.1 0.03 0.1 0.03 - - - -

Thermostat Peltier Peltier Peltier Peltier Peltier Peltier Peltier Peltier

Temperature range [°C] 15…70 15…50 15…50 15…50 4…90 4…90 4…70 15…40

Temperature compensation yes yes yes yes yes yes yes no

Viscosity correction(density)

- - yes yes yes yes yes no(not required)

Typical measurement time [s] 15 15 40 40 30 40 40 20

Measurement methods 9 + 11) 9 + 11) 9 + 11) 9 + 11) 9 + 11) 9 + 11) 9 + 11) 1

Official methods Brix Brix, HFCS42, HFCS55

Brix, HFCS42, HFCS55, Alcohol, API

Brix, HFCS42, HFCS55, Alcohol, API

Brix, Alcohol, API

Brix, Alcohol, API

Brix, Alcohol, API

-

User-definedconcentration tables

9 9 18 18 9 9 9 -

Password protection yes yes yes yes yes yes yes no

Automatic error detection yes2) yes2) yes2) yes2) yes2) yes2) yes2) no

Memory card no yes yes yes yes yes yes no

Connections

Printer yes yes yes yes yes yes yes yes

Barcode reader yes yes yes yes yes yes yes no

Computer yes yes yes yes yes yes yes yes

Automation units SC1, SC30 SC1, SC30 SC1, SC30 SC1, SC30 SC1, SC30, ASU-DE

SC1, SC30, ASU-DE

SC1, SC30, ASU-DE

ASU-100

1) One method is reserved for the adjustment of the instrument2) Only available if an SC1 or SC30 (or ASU-DE) automation unit is connected

The PortableLab™ – Measure anywhere just like in the laboratoryMETTLER TOLEDO of course offers portable density meters and refractometers:The Refracto 30PX and 30GS are compact, easy-to-use refractometers. Depending on the application, they can be operated either as bench-top or immersion refractometers.The Densito 30PX is a real multi-talent as far as density measurement is concerned. Precise determina-tions can be made in just a few seconds, and the result is displayed directly in the desired units.

Would you like to know more about the PortableLab instrument family, see the instruments in practi-cal use or take a look at the operating instructions? We will gladly provide you with the information you require and welcome you any time at our Internet address (www.PortableLab.com).

Subject to technical changesPrinted in Switzerland 51724273B© 12/2004 Mettler-Toledo GmbH

Mettler-Toledo GmbH, Analytical,CH-8603 Schwerzenbach, SwitzerlandPhone +41-1-806 77 11, Fax +41-1-806 73 50Internet: http://www.mt.comInternet: http://www.density.comInternet: http://www.refractometry.com

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