DM70Hand-held Dewpoint Meter

Truly Fast Response - Superior Long-term Stability

Withstandscondensation

Compact, smalland light

Data-logging andtransferring capabilities

DM70 - When Dry Air Is Important

The DM70 Hand-held DewpointMeter measures dewpointtemperature accurately in a widemeasurement range – from -60 °Cto +60 °C. It has a truly fastresponse time between start-upfrom ambient conditions to lowand high process dewpoints.

DM70 incorporates Vaisala’sadvanced DRYCAP® technology,which enables reliable and highperformance dewpointmeasurement. The probewithstands condensation and alsomeasures directly in pressurizedspaces.

DM70 has a versatile and easy-to-use menu based user interfaceand a clear graphical LCD displaywith data-logger function. It canalso be used as a tool for readingthe output of fixed Vaisaladewpoint transmitters likeDMT242 and DMP248.

Designed for industrialapplications

The Vaisala DM70 Hand-held Dewpoint Meter offers stable and fast measurement forindustrial dewpoint applications.

Plastic drying before molding is one of many applications for DM70 Hand-held Dewpoint Meter. Excess moisture in themolding process causes imperfections on the end products.

The optional ready-to-useWindows® software provides aneasy way to handle measurementdata in PC environment. Ananalog output option is alsoavailable. Low power consumptionprovides a long operation in thefield. This makes DM70 evenmore user friendly.

readout to a real time graphicsdisplay, so the user will knowwhen the dewpoint plateau isreached.

The HOLD/SAVE functionenables the user to freeze acertain display function andsave it into the meter's memory.Graphic history shows the datacurve from the time turning onthe device. The graph is easilyscalable in the display.

Easy-to-use user interfaceThe DM70 Hand-heldDewpoint Meter has an easy-to-use user interface. The defaultshortcut keys refer to thefunctions GRAPHIC, HOLD/SAVE and RECORD. Ifneeded, the functions behindthe shortcut keys canbe easily changedcorrespondingto the user'sneeds.

Data-logging and datatransferring capabilityThe DM70 Dewpoint Meter canbe used as an on-site data-logger.To simplify operation, DM70 hasa sophisticated MI70 LinkWindows® software program. It isa practical tool for transferringlogged data and real timemeasurement data from DM70 toa PC.

The DM70 Dewpoint Meter hasrugged structure. The housing isprotected against dust and splashedwater, which ensures reliableoperation even in most demandingconditions.

DM70 displays one to threeparameters at a time eithernumerically or graphically.

Convenient measurementin dry conditionsVarious output variablesDM70 displays user selectablehygrometric units, such asdewpoint/frostpoint temperature,relative humidity, ppm

v (humid

air volume/dry air volume) andalso the process temperature. Themeter displays one to threeparameters at a time in metric ornon-metric units.

Both numerical and graphicalmeasurement dataThe measurement data can bedisplayed either numerically orgraphically in the LCD display.One key press will change the

DRYCAP and Auto-calibration

The microprocessor based DM70Dewpoint Meter incorporates theDRYCAP Thin Film Polymer

performance with minimummaintenance.

Withstands condensationDRYCAP Sensor is immune towater condensation, particulatecontamination, oil mist and mostchemicals. Since the sensor canwithstand condensation, itsperformance is unmatched forlow dewpoint applications thatcould experience process waterspikes, such as condensation inthe pipeline during system failureor startup.

Sensor and auto-calibrationprocedure, a combination thatmakes it ideal for use in dryambient applications.

Auto-calibration correctsdry-end driftsThe auto-calibration procedureworks on-line while the process isrunning. The software makes acorrection for any dry end driftto the calibration curve. Thisintelligent auto-calibrationprocedure gives the DM70 Hand-held Dewpoint Meter a superior

Free and Easy Measurement in the Field

The MI70 Link program enables theeasy handling of the measurementdata of DM70 by a computer both ingraphical and numerical formats.

DM70 Hand-held DewpointMeter is calibrated at the factoryagainst internationally traceablestandards and delivered with acalibration certificate. DM70 canalso be sent to Vaisala ServiceCenter for a traceable re-calibration.

Various applicationsSpot-checking instrumentVaisala’s DM70 Hand-heldDewpoint Meter has a truly fastresponse time for temporarydewpoint measurements. DM70meter can be used in manyindustrial dewpoint spot-checking applications, such ascompressed air lines and plasticmolding processes.

Field-checking instrumentDM70 can perform the one-pointcalibration check in the processfor Vaisala's DMT242 andDMP248 fixed dewpointtransmitters. Transmitters can beconnected to DM70 by usingoptional connection cables.

DSC74 Sample CellAdapterDM70 can be connected to thepressurized processes easily byusing Vaisala's Sample CellAdapter DSC74. It is deliveredwith several installation options.

The DM70 Hand-held DewpointMeter equipped with DSC74 SampleCell Adapter.

Lightweight constructionThe DM70 Dewpoint Meter issmall and rugged and thereforean ideal choice for even themost demanding applications.The long battery life enables freeand easy use of the DM70 Meterin the field.

Long-term stablilityThe DRYCAP measurementtechnology in DM70 providesrevolutionary long-term stability.This leads to a long calibrationinterval. An additional advantageis the sensor's durability againstcondense.

Dew

poin

t tem

pera

ture

(˚C

)

0 20 40 60

0

40

-60

-80

Process temperature (˚C)

102030

506070

-10-20-30

-50-40

-70

-90

3010 50

Accuracy < ± 2˚C Td

Dewpoint measurement range lower limit

-10

DMP74 Dewpoint Measurement Probe

Measured variables

DewpointMeasurement range (typical) -60...+60 °CAccuracy -50...+60 °C ±2 °C

see the graph below

Technical Information

MI70 Measurement Indicator

Indicator generalMenu languages English, German, French,

Finnish and SpanishDisplay LCD with backlight

Graphic trend display of any parameterCharacter height up to 16 mm

Probe inputs 1 or 2Power Supply Rechargable NIMH batterypack

with AC-POWER or4xA4 size alkalines, type IEC LR6

Analog output 0...1 VDCOutput resolution 0.6 mVData interface RS232CData-logging capacity 900...2700 points with real timeAlarm Audible alarm functionOperating temperature range -10 ...+40 °COperating humidity range non-condensingHousing classification IP54Weight 400 g

Battery operation timeContinuous use 48 h typical at +20 °CDatalogging use up to 30 days

DMP74 Probe + MI70 Indicator =DM70 Hand-held Dewpoint Meter

GeneralHousing materials ABS/PC blendStorage temperature -40...+70 °CStorage humidity 0..100 %RH non condensingTotal weight 750 g

Electromagnetic compatibilityComplies with the following standard:EN 61326-1:1997 + Am1:1998, Electrical equipment formeasurement, control and laboratory use - EMCrequirements - Generic Environment.

AccessoriesDSC74 sample cell adapter

sampling system for pressurized processesPressure range 0...10 bar

gWeight 300 g

Connection cablesfor DMT242 Transmitter order no: 27160ZZfor DMP248 Transmitter order no: 27159ZZ

Analog output cable order no: 27168ZZWindows® software including PC connection cable

order no: MI70LINK

Response time63% (90%) at flow rate 0.2 m/s, 1 bar pressure, +20 °C

-50 → 0 °C Td

10 s [35 s]0 → -20 °C T

d10 s [35 s]

0 → -40 °C Td

15 s [120 s]0 → -50 °C T

d35 s [300 s]

TemperatureMeasurement range -10....+60 °CAccuracy at +20°C ±0.2 °CTypical temperature dependenceof electronics ±0.005 °C/°CTemperature sensor Pt100 IEC751 1/3 class B

ppm volume concentrationMeasurement range (typical) 40...200 000 ppmAccuracy at +20°C 7.3 ppm + 8.3% of reading

Relative humidityMeasurement range 0...100 %RHAccuracy at +20°C

RH < 10% ±0.025 %RH + 8.75% of readingRH > 10% ±0.7 %RH + 2% of reading

Measurement environmentTemperature -10....+60 °CPressure 0...20 barSample flow rate no effect

Probe generalSensor DRYCAP 180SProbe material (wetted parts) Stainless steel (AISI 316L)Sensor protection Sintered filter (AISI 316L)

partno: HM47280Mechanical connection G1/2" ISO228-1 thread

with bonded seal ring (U-seal)Housing classification IP65 (NEMA4)Weight 350 g

Specifications subject to change without prior notice.DRYCAP® is a registered trademark of Vaisala.©Vaisala Oyj

MI70 Indicator - multiple probe options

Dimensions

Ref

. B01

0162

en 2

001-

05C

over

pho

to c

ourt

esy

by A

tlas

Cop

co

DSC74 samplecell adapter

DMP74 probe

MI70 indicator

MI70 Indicator is a general indicator withmultiple probe options. It enables themeasurement of several different parameterssimply by changing the probe.

Please ask further information about other probeoptions for MI70 Indicator from Your localVaisala dealer.