Vaisala DMT152 Dew Point Transmitter


  • Compact and accurate
  • Vaisala DRYCAP® technology with a polymer sensor
  • Measures dew point down to -80°C (-112 °F)
  • Reduced maintenance costs due to long calibration interval
  • Withstands condensation
  • Traceable to national standards
  • Compatible with the Vaisala MI70 indicator, optional loop powered display, Nokeval 301

Dpstar is a leading supplier of environmental measurement sensors for temperature, relative humidity, pressure, dew point, CO2, and other environmental condition monitoring for industrial process application and research. Since the ’90s, we earned a reputation as a trusted partner to our clients through our commitment and dedication. We are an authorized distributor and supplier of measuring sensors solutions from renowned manufacturers Vaisala. Vaisala is a global leader in environmental and industrial measurement. Building on 80 years of experience, Vaisala provides observations for a better world. Vaisala is a reliable partner for customers around the world, offering a comprehensive range of innovative observation and measurement products and services.

Vaisala DRYCAP® Dew Point Transmitter DMT152 is designed for measuring low dew point in OEM applications, even down to −80 °C (−112 °F). The excellent long-term stability and reliability of its performance is based on the latest DRYCAP® polymer sensor technology.

Dimension in mm [in]

Key Benefits


Stable measurement enable long calibration intervals and reduced maintenance costs


Withstands demanding conditions such as the combination of low humidity and hot air

Low Maintenance

The DMT152 mechanics have been designed for harsh environments requiring protection against dust, dirt, and splashed water. The DRYCAP® technology has a low maintenance need due to its excellent long-term stability and durability against condensation


The DMT152 is an ideal choice for industrial applications where it is necessary to control very low humidity. DMT152 is an ideal choice for the semiconductor industry, air and plastics dryers, glove boxes, dry chambers, pure gases, additive manufacturing, high voltage circuit breakers and other applications where it is critical to control humidity with high accuracy. The DMT152 measures accurately and reliably also in the challenging combination of low humidity and hot air, which is typical in plastics drying.


Measurement Performance
Sensor Vaisala DRYCAP 180U
Thin-film capacitive polymer sensor
Recommended calibration interval 2 years
Dew Point Temperature 1)
Measurement range −80 … −20 °C (−112 … −4 °F) Td
−80 … −40 °C (−112 … −40 °F) ±2 °C (3.6 °F) Td
−40 … −20 °C (−40 … −4 °F) ±3 °C (5.4 °F) Td
Non-calibrated range −100 … +20 °C (−148 … +68 °F) Td
Typical response time 63 % [90 %] at a gas temperature of +20 °C (+68 °F) and pressure of 1 bar:
−20 … −80 °C Td 0.5 min [7.5 min]
−80 … −20 °C Td 2 s [5 s]
Typical long-term stability Better than 2 °C (3.6 °F) / year
Concentration by Volume (ppm)
Measurement range (typical) 0 … 500 ppm
Accuracy at +20 °C (+68 °F), 1013 mbar ±(0.2 ppm + 20 % of reading)
1) When the dew point is below 0 °C, the transmitter outputs frost point for Td.
Inputs & Outputs
Two analog outputs (scalable) 4 … 20 mA, 0 … 20 mA (3-wire)
0 … 5 V, 0 … 10 V
Digital output RS-485 (2-wire)
Alarm-level indication by analog signal User selectable
Purge information 5 V, 10 V, 20 mA, or LED
Accuracy of analog outputs ±0.01 V / ±0.01 mA
Operating Voltage
RS-485 output 11 … 28 VDC 1)
Voltage output 15 … 28 VDC 1)
Current output 21 … 28 VDC
Supply Current
Normal measurement 20 mA + load current
During self-diagnostics Max. 220 mA pulsed
Supply voltage fluctuation Max. 0.3 V
External Load
Voltage output Min. 10 kΩ
Current output Max. 500 Ω
1) For extended temp. down to −40 °C (−40 °F) or pressure up to 50 bar (725 psia), the supply voltage is 21 … 28 VDC.
Operating Environment
Temperature −40 … +70 °C (−40 … +158 °F)
Relative humidity 0 … 100 %RH (up to +20 °C / +68 °F)
Pressure 0 … 50 bar (725 psia)
Measurement environment For air, nitrogen, argon, helium, and oxygen 1)
Not suitable for measurements in hydrogen or pure carbon dioxide
Sample flow rate No effect on measurement accuracy
EMC compliance EN61326-1, Industrial environment
1) Consult Vaisala if other chemicals are present. Consider safety regulations with flammable gases
Mechanical Specifications
Housing material (wetted parts) AISI316L
Stainless steel mesh filter Filter body AISI303, mesh AISI316L, grade 18 μm
Mechanical connections ISO G1/2″, NPT 1/2″, UNF 3/4″- 16″, UNF 5/8″-18″
IP rating IP66
Storage temperature range −40 … +80 °C (−40 … +176 °F)
Weight (ISO G1/2″) 190 g (6.70 oz)
Connection cable for MI70 handheld indicator 219980
USB cable for PC connection 219690
Loop-powered external display (Nokeval 301) 226476
Loop-powered external display with relays (Nokeval 302) 234759
NW40 flange 225220SP
Sampling Cells (Available for ISO G1/2″)
Basic sampling cell DMT242SC
With Swagelok 1/4″ male connectors DMT242SC2
With a quick connector and leak screw DSC74
Two-pressure sampling cell DSC74B


Vaisala DMT152 Dew Point Transmitter_DpstarGroup