DMT152 Dewpoint Transmitter for Low Dew Point Measurement in OEM Applications

The Vaisala DRYCAP® Dewpoint Transmitter DMT152 is designed for measuring low dew point in OEM applications, even down to -80°C.

  • 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
  • Fast response time
  • Withstands condensation
  • NIST traceable
  • Compatible with the Vaisala MI70 indicator
  • Optional loop powered display, Nokeval 301

DMT152 Dewpoint Transmitter for Low Dew Point Measurement in OEM Applications

Operating Principle

DRYCAP’s unrivalled performance is based on two innovations: the proven capacitive thin-film polymer   sensor and the auto-calibration function. The sensor’s thin-film polymer absorbs or releases water vapor  as the surrounding humidity increases or decreases.

The dielectric properties of the polymer change as the  humidity around the sensor changes, as does the capacitance of the sensor. Capacitance is converted into a humidity reading. The capacitive polymer sensor is bonded together with a temperature sensor, and dew point is calculated from the humidity and temperature readings.

Vaisala’s patented auto-calibration function optimizes the measurement stability at low dew points. The sensor is heated at regular intervals during the automated auto-calibration procedure.

The humidity and temperature readings are monitored as the sensor cools to ambient temperature, with offset correction compensating for any potential drift. This enables the DRYCAP sensor to deliver accurate measurements in the long term, dramatically reducing the need for maintenance.