Dewpoint Transmitters for High Temperature Applications



  • The DMT345 measures humidity in temperatures up to 180 °C (356 °F)
  • The DMT346 measures humidity in temperatures up to 350 °C (+662 °F)
  • Dew point accuracy ±2 °C (±3.6 °F)
  • Vaisala DRYCAP® Sensor provides accurate, reliable measurement with excellent long-term stability and fast response
  • Withstands condensation
  • Unique auto-calibration feature
  • Optional local display with keypad, mains power supply module and alarm relays
  • NIST traceable calibration (certificate included)
  • Analog outputs, WLAN/LAN
  • MODBUS protocol support (RTU/TCP)

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

Both transmitters incorporate the Vaisala DRYCAP® sensor, which is accurate, reliable, and stable. The sensor withstands condensation and is immune to particulate contamination, oil vapor and most chemicals. The DRYCAP® sensor stands out for its swift response time and rapid recovery after getting wet.

Measure Humidity Directly in Hot Processes

The DMT345 and DMT346 are constructed for direct measurement in hot processes. Therefore, there is no need for sampling systems and trace heating. As a result, high accuracy and constancy are maintained.

The accuracy and stability of the DMT345 and the DMT346 are due to the unique auto-calibration function, patented by Vaisala. This autocalibration makes the transmitter perform a calibration and adjustment by itself while the measured process is running. If the measurement accuracy is not confirmed, corrections are made automatically. The procedure is so quick and corrections are so minor that it will go unnoticed. This ensures low maintenance and high performance. In normal conditions, it is recommended to have a traceable calibration performed once a year.

DMT345, Accurate in Hot and Dry Environments

The DMT345 is designed for accurate humidity measurement in hot and dry conditions. This model provides unmatched dry end measurement accuracy in temperatures up to 140 °C, however the DMT345 can operate safely in temperatures up to 180 °C.

The stainless steel probe is especially designed for high temperatures and has an optional installation flange that allows an adjustable installation depth and therefore a precise positioning.


Types Of Dew Point Products - Fixed Installations

  • DMT340

  • DMT345/DMT346

  • DMP5

  • DMP6

  • DMP7

  • DMP8