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DMT142 Miniature Dewpoint Transmitter

for OEM Applications

The Vaisala DRYCAP

Dewpoint Transmitter DMT142 is an ideal choice for

small compressed air dryers, plastic dryers and other OEM applications.

Features/Beneﬁts

▪

Miniature size dew point

transmitter for e.g. small

industrial dryer applications

▪

Vaisala DRYCAP® technology

with auto-calibration

▪

Calibration interval of two years

▪

Dew point measurement range

-60 ... +60 °C (-76 ... +140 °F)

with an accuracy ±3 °C (±5.4°F)

▪

Withstands condensation

▪

Fast response time

▪

Compatible with Vaisala

DRYCAP

Hand-Held Dewpoint

Meter DM70

▪

NIST traceable (certiﬁcate

included)

Vaisala DRYCAP®

The Vaisala DRYCAP

Dewpoint

Transmitter DMT142 is a miniature

dew point measurement instrument.

The transmitter can be installed

directly into pressurized systems at

50 bar (725 psia) maximum pressure.

The long-term high performance

is achieved with Vaisala DRYCAP

technology.

The sensor fully withstands getting

wet, and therefore, the transmitter

performs exceptionally well in

applications that occasionally

experience process water spikes,

such as pipeline condensation during

a system failure or start-up. The

sensor is also immune to particulate

contamination, oil vapor and most

chemicals, and is insensitive to the

ow rate.

Long calibration interval

The calibration interval of the

DMT142 is two years. Additionally,

the Vaisala DRYCAP

Hand-Held

Dewpoint Meter DM70 can be used

to conrm the performance of the

DMT142 without disconnecting the

transmitter. For any adjustment

needs, the transmitter can be sent to

Vaisala Service.

The auto-calibration software works

on-line while the process is running.

If the measurement accuracy is not

conrmed, corrections are made

automatically.

Easy installation

The DMT142 has a variety of features

to choose from, including different

output and installation options. Due

to its small size and light weight,

the DMT142 is quickly and easily

installed in tight spaces or in small-

size pipelines.

The Vaisala DRYCAP

Hand-Held

Dewpoint Meter DM70 is ideal for

confirming the performance of the

DMT142 in the field.

Technical data

Ref. B210375EN-B ©Vaisala 2009

This material is subject to copyright protection, with all

copyrights retained by Vaisala and its individual partners. All

rights reserved. Any logos and/or product names are trademarks

of Vaisala or its individual partners. The reproduction, transfer,

distribution or storage of information contained in this brochure

in any form without the prior written consent of Vaisala is strictly

prohibited. All speciﬁcations — technical included — are subject

to change without notice.

Measured variables

DEW POINT TEMPERATURE

Measurement range(typical)

Standard version -40 ... +60 °C (-40 ... +140 °F) T

Extended version -60 ... +60 °C (-76 ... +140 °F) T

version -50 ... +60 °C (-58 ... +140 °F) T

Analog output scalings

option 1 -80 ...+20 °C (-112 ... +68 °F) T

option 2 -60 ... +40 °C (-76 ... +104 °F) T

option 3 free scaling

Accuracy ±3 °C (±5.4 F) T

(see graph below)

(when the dew point is below 0 °C (32 °F), the transmitter outputs

frostpoint)

Operating environment

Temperature *) -40 ... +60 °C (-40 ... +140 °F)

Relative humidity 0 ... 100 %RH

Pressure *) 0 ... 50 bar

(725 psia)

Sample ﬂow rate no effect for measurement accuracy

*) For extended temperature down to -40 °C (-40 °F) or pressure up

to 50 bar

(725 psia) the supply voltage must be 24 ... 28 VDC.

Outputs

Analog output (scalable) 4 ... 20 mA (3-wire), 0 ... 1 V/5 V

Resolution for current output 0.002 mA

Resolution for voltage output 0.3 mV

Typical temperature dependence 0.005% of span / °C

Connector 4-pin M8 (IEC 60947-5-2)

connection cable with snap-on or thread locking available

RS232 serial line for service use with DMT142RS cable

General

Sensor Vaisala DRYCAP

180D

Measured gases non-corrosive gases

(SF

gas with special model)

Recommended calibration interval

to conﬁrm the speciﬁed accuracy 2 years

Operating voltage with voltage output 12 ... 28 VDC

Operating voltage with current output 18 ... 28 VDC

Supply current

normal measurement 10 mA + load current

during self-diagnostics max. 220 mA pulsed

Load for current output max. 500 ohm

Load for voltage output min. 10 kohm

Housing material stainless steel body (AISI316L)

plastic cap(ABS/PC)

Sensor protection stainless steel sintered ﬁlter

Mechanical connection G1/2” ISO 228-1 thread

with bonded seal ring

(U-seal)

Housing classiﬁcation IP64 (NEMA 3S)

Storage temperature range -40 ... +80 °C (-40 ... +176 °F)

Weight 118 g (4.16 oz)

Complies with EMC standard EN61326-1, Electrical equipment

for measurement, control and laboratory use - EMC requirements;

Industrial environment.

DEW POINT ACCURACY VS. MEASUREMENT CONDITIONS

Dew point accuracy range for the extended version. Standard

version with dotted line.

Response time 63% [90%] at +20 °C gas temperature and 1 bar

pressure

-60 -> -20 °C T

(-76 -> -4 °F T

) 5 s [10 s]

-20 -> -60 °C T

(-4 -> -76 °F T

) 45 s [10 min]

PPM VOLUME CONCENTRATION

Measurement range 70 ... 200 000 ppm

Accuracy at +20 °C (+68 °F), 1013 mbar 7.3 ppm + 9.2% of reading

Accessories

Output cable M8, snap-on connector, 2 meters 211598

Output cable M8, thread connector, 3 meters HMP50Z300, several

lengths available

Connection cable for DM70 211917ZZ

Service cable for serial line DMT142RS

Sampling cells

basic sampling cell DMT242SC

with Swagelok 1/4" male connectors DMT242SC2

with quick connector and leak screw DSC74

two-pressure sampling cell DSC74B

cooling/venting coil DMCOIL

See DM70 / Portable Sampling Systems and Sampling Cells for

further information about sampling cells available

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