DMT345 and DMT346 Dewpoint Transmitters for High Temperature Applications

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The Vaisala DRYCAP® Dewpoint Transmitters DMT345 and DMT346 are designed for humidity measurement in industrial drying applications with particularly high temperatures.

  • The DMT345 measures humidity at temperatures up to 180°C (+356 °F)
  • The DMT346 measures humidity at temperatures up to 350 °C (+662 °F)
  • Unique auto-calibration
  • Vaisala DRYCAP® Sensor provides accurate, reliable measurement with excellent long-term stability and fast response time
  • Condensation-resistant
  • Graphical display with keypad for convenient operation
  • Optional mains power supply module and alarm relays
  • Integrated data logging, with over four years of measurement history
  • LAN and WLAN communication options
  • NIST traceable calibration (certificate included)
DMT345 and DMT346 Dewpoint Transmitters for High Temperature Applications 

DMT345 and DMT346 Dewpoint Transmitters for High Temperature Applications 

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Vaisala Warranty & Support

All Vaisala products and services are protected by full, 12-month warranty coverage as the standard minimum, with selected products being covered for up to 24 months. During the warranty period customers benefit from free repair or, where required, replacement. Standard repair lead times apply unless otherwise agreed.

Please contact Automatic Controls Company with any inquiries regarding warranty claims, repairs, service contracts, calibrations, or spare parts.

Extended Warranty

An extended warranty from Vaisala ensures repair or replacement of equipment for five years, guaranteeing optimal system performance and eliminating costly and inconvenient delays caused by repair or replacement quotation and approval processes.

Extended warranties are available for both new or previously purchased Vaisala products, though previously purchased products may require baseline calibration.

For more details on Vaisala warranty services, or if you are interested in customized or long-term warranty and priority service scheduling, please contact Vaisala Sales to discuss your needs.

Technical Support

Chat with us or call (502) 266-6640.

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.

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