Flagship Dewpoint and Temperature Transmitter DMT340 series

for Demanding Low Humidity Conditions

Condensation-resistant Vaisala Dewpoint Transmitter DMT340 is designed for industrial low-humidity applications such as industrial drying, compressed air systems, semiconductor industry, dry rooms, baking ovens, and metal heat treatment to provide accurate and reliable measurement.

What is Dewpoint?

Dew point is the temperature to which air must be cooled for water vapor in it to condense into dew or frost. At any temperature there is a maximum amount of water vapor that the air can hold. This maximum amount is called water vapor saturation pressure. Addition of more water vapor results in condensation.


  • DMT341 for wall-mounting

  • DMT342 with small size flanged probe for use with sampling cell

  • DMT344 for pressurized processes, 

  • DMT347 with small pressure-tight probe

  • DMT348 for pressurized pipelines, see also DMP8

DMT340 is compatible with the Vaisala DRYCAP® Handheld Dew Point Meter DM70.


  • Vaisala DRYCAP® sensor provides accurate, reliable measurement with excellent long-term stability and fast response time

  • Condensation-resistant

  • Unique auto-calibration feature

  • Graphical display and keypad for convenient operation

  • Optional alarm relays and mains power supply module

  • Integrated data logging with over four years of measurement history

  • LAN communication option

  • Traceable calibration (certificate included)

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