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DMT242 Dewpoint Transmitter for

OEM Applications

Due to its wide measurement range and high long-term stability, the DMT242 is an

ideal choice for low dewpoint industrial applications such as compressed air dryers,

plastic dryers and other OEM applications.

Features/Beneﬁts

▪

Ideal choice for industrial dryer

applications

▪

Incorporates advanced Vaisala

DRYCAP® Sensor and enhanced

auto-calibration software

▪

Long-term stability in low

dewpoints

▪

Fast response time

▪

Two sensor options cover

dewpoint measurement range

from -60 … +60 °C

(-76 … +140 °F) with an

accuracy of ±2 °C (±3.6 °F)

▪

Withstands condensation

▪

NIST traceable (certiﬁcate

included)

▪

Compatible with Vaisala

DRYCAP® Hand-Held Dewpoint

Meter DM70

Vaisala DRYCAP

The Vaisala DRYCAP

Dewpoint

Transmitter DMT242 provides

reliable and stable measurements

for industrial dryer applications. It is

designed for extreme conditions.

DMT242 incorporates the Vaisala

DRYCAP

thin lm polymer sensor

and auto-calibration software.

The standard sensor choice for

dry gases and desiccant dryers is

DRYCAP

180M and for more humid

applications such as regeration

dryers, a DRYCAP

180S sensor.

Both the sensors are immune to

particulate contamination, water

condensation, oil vapor and most

chemicals. Because the sensor

withstands condensation, its

performance is unmatched for

low dewpoint applications that

experience process water spikes,

such as pipeline condensation during

a system failure or start-up.

The auto-calibration software works

on-line while the process is running.

If the measurement accuracy is not

conrmed, corrections are made

automatically. The DMT242 adjusts

the measurement, corrects dry-end

drifts and continues to function.

Calibration occurs quickly, and

with corrections so minor, it will go

unnoticed.

Compact, rugged and

intelligent

Due to its compact size, DMT242 is

quickly and easily installed in tight

spaces.

Users can perform a eld-check by

using the Vaisala DRYCAP

Hand-

Held Dewpoint Meter DM70. The

transmitter can be sent to Vaisala

Service for NIST traceable calibration.

The recommended calibration

interval is every two years.

The Vaisala DRYCAP

Hand-Held Dewpoint

Meter DM70 is ideal for confirming the

performance of the DMT242 in the field.

Technical data

Ref. B210765EN-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.

Dewpoint temperature (°C)

20 40 60

-60

-80

Process temperature (°C)

-10

-20

-30

-50

-40

-70

3010

Accuracy < ± 2°C Td

Dewpoint measurement range lower

limit

Water vapor saturation line

For more information, visit

www.vaisala.com or contact

us at sales@vaisala.com

Dewpoint temperature

Measurement range (typical) -60 ... +60 °C (-76 ... +140 °F)

Analog output scalings

Option A -80 ...+20 °C (-112 ... +68 °F) T

Option B -60 ... +60 °C (-76 ... +140 °F) T

Option X free scaling

(when the dewpoint is below 0 °C (32 °F),

the transmitter outputs frostpoint)

Accuracy with DRYCAP

180M ±2 °C (±3.6 °F)

(see graph below)

Operating environment

Temperature 0 ... +60 °C (32 ... +140 °F)

higher temperature peaks Short-term OK

Relative humidity 0 ... 100 %RH

Pressure 0 ... 20 bara (0 ... 290 psia)

Sample ﬂow rate no effect

Output

Analog output 4 ...20 mA

Resolution for analog output ±0.002 mA

Typical temperature dependence 0.0008 mA/ °C

Serial line for service use RS232

General

Sensor DRYCAP

180M

Optimal sensor for refrigeration dryers DRYCAP

180S

Operating voltage 18 - 35 VDC, 20 - 28 VAC

Power consumption at 24 VDC max. 220 mA

External load for analog output max. 500 

Optional connection cable with

DMT242 connector 2 m or 10 m

Connector for supply voltage and

signal output

max. wire size 0.75 mm

max. cable diameter 6.5 mm /PG7

Service cable for serial interface

RS232 product code DMT242RS

Probe material (wetted parts) stainless steel

(AISI 316L)

Sensor protection stainless steel

sintered ﬁlter (HM47280)

Mechanical connection G½” ISO228-1 thread with

bonded seal ring (U-seal)

Eletronics housing material plastic (ABS/PC)

Housing classiﬁcation IP65 (NEMA4)

Storage temperature range -40 ... +70 °C, (-40 ... +158 °F)

Complies with the EMC standard EN61326-1, Electrical equipment

for measurement, control and laboratory use - EMC requirements;

Industrial environment.

DEWPOINT ACCURACY VS. MEASUREMENT CONDITIONS

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

Flow rate >1 l/min and 1 bar pressure

-60 -> -20 °C Td (-76 -> -4 °F Td) 5 s [10 s]

-20 -> -60 °C Td (-4 -> -76 °F Td) 45 s [10 min]

Accuracy with DRYCAP

180S ±2 °C (±3.6 °F)

(see graph below)

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 122 123

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