DewTrak II Chilled Mirror Hygrometer Transmitter

Featured Product from Edgetech Instruments Inc.

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The Edgetech Instruments DewTrak II dew/frost point / humidity transmitter is an optical chill mirror hygrometer designed to continuously measure the moisture content in gases.

The DewTrak II uses the primary method chilled mirror dew/frost point temperature condensation principle to determine the water vapor concentration in gas mixtures, and a platinum resistance thermometer to accurately measure that temperature. Outputs include 4 to 20 mA, 0 to 5 Vdc, or 0-10 Vdc and an RS232 serial port as well as electrically isolated relay contacts.

The DewTrak II is now available with the new DX chilled mirror dew/frost point sensor. With an integral PRT temperature sensor, wider operating range and improved temperature stability, the new DX sensor can be inserted into the process stream or used to monitor the local environment. With its integrally mounted temperature sensor, a single penetration reduces installation cost and improves relative humidity accuracy, as the temperature and dew/frost point are measured at the same location.

Active cooling gives the DX sensor enhanced stability and a dynamic range of -40°C to +95°C dew/frost point with a temperature depression of 65°C from ambient temperature, while active sensor temperature compensation and isolation eliminate drift. An integrated micro-aspirator option gives faster response in static environments and an integral barometric pressure measurement option is available on request. Integrated filter options are available for use in dirty environments.


  • Primary method chilled mirror dew/frost point sensor
  • ±0.2°C Accuracy for both dew/frost point and temperature
  • Long term stability and repeatability
  • RS232, bi-directional, serial output
  • Electronics housed in wall mount IP65 enclosure
  • Aluminum housing for other configurations
  • 2 analog outputs, 4-20 mA / 0-5 Vdc to 0-10 Vdc selectable

Edgetech Instruments Inc. designs and manufacturers accurate and reliable absolute humidity hygrometers, relative humidity transmitters, humidity probes, moisture and dew/frost point analyzers, relative humidity calibrators, dew/frost point generators and oxygen measurement instrumentation. Edgetech Instruments products are manufactured, calibrated and serviced to the highest industry standards in a modern, ISO/IEC 17025:2005 accredited, ISO 9001:2015 registered facility located in Hudson, Massachusetts. All certifications and calibrations are traceable to NIST.