DM70 Hand-Held Dewpoint Meter for Spot-Checking Applications

The Vaisala DRYCAP® Hand-Held Dewpoint Meter DM70 measures dew point temperature accurately over a wide measurement range.

The probe may be inserted directly into pressurized processes, and it responds rapidly from ambient to process conditions. The sensor withstands condensation and fully recovers from getting wet.

  • Designed for industrial spot checking and field calibration
  • Fast response, enhanced by Sensor Purge function
  • Easy-to-use user interface
  • Data can be logged and transferred to a PC via MI70 Link software
  • Multiprobe operation; relative humidity and CO2 probes can also be connected
 
 DM70 Hand-Held Dewpoint Meter for Spot-Checking Applications

DM70 Hand-Held Dewpoint Meter for Spot-Checking 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.