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Sensors & Transmitters
   Data Acquisition
   pH and ORP
   Relative Humidity / Dewpoint
     RH Fixed Installation
     RH Portable Instruments
     Probes and OEM Modules
       DMT242 Dewpoint Transmitter
       DMT152 Dewpoint Transmitter
       DMT142 Dewpoint Transmitter
       HMP155 Humidity &Temp Probe
       HMP50 Humidity and Temp Probe
   Differential Pressure
   Carbon Dioxide
   Nitrogen Dioxide
   Carbon Monoxide
   Smoke Detectors
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Tel: 1-925-706-7433

Vaisala DMT242 Dewpoint Transmitter
Vaisala Instruments

DMT242 Dewpoint Transmitter

Vaisala DMT242 Series

Designed for OEM system integrations. Ideal for dryers and dry air systems
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 film 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 refigeration 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 confirmed, 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

Compact, rugged and intelligent - Due to its compact size, DMT242 is quickly and easily installed in tight spaces. Users can perform a field-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

PDF File Datasheet
Dewpoint temperature measurement

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

-80 ... +60 °C (-112 ... +140 °F)
± 2 °C (± 3.6 °F)
Vaisala DRYCAP® 180M

Operating environment

Relative humidity

0 ... +60 °C (+32 ... +140 °F)
0...100 % RH
0 ... 20 bar (0 … 290 psia)

Inputs and outputs

Operating voltage

Power consumption @ 24 VDC
Analog output

18 - 35 VDC
20 - 28 VDC
max. 220 mA
4 ... 20 mA


Material (electronics housing)
Housing classification

Plastic (ABS/PC)
IP65 (NEMA 4)

DMT242 Dewpoint Transmitter

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