Humidity and Temperature Transmitters for Demanding Humidity Measurement



  • Six models for demanding industrial applications
  • Full 0 ... 100 % RH measurement, temperature range up to +180 °C (+356 °F) (depending on model)
  • Pressure tolerance up to 100 bar (depending on model)
  • Next generation Vaisala HUMICAP® Sensor for excellent accuracy and stability
  • Graphical display of measurement trends and over four-year history
  • Multilingual user interface
  • Excellent performance in harsh chemical concentrations
  • Corrosion resistant IP65 housing
  • NIST traceable (certificate included)
  • Analog outputs, WLAN/LAN
  • MODBUS protocol support (RTU/TCP)

The Vaisala HUMICAP® Humidity and Temperature Transmitter Series HMT330 is designed for demanding industrial applications where stable measurement and wide customization is important.

Vaisala HUMICAP® Performance
The HMT330 series incorporates Vaisala's 30 years of experience in industrial humidity measurement.
An updated, even more stable and chemical resistant HUMICAP® sensor is available, next to the proven reliable and accurate sensor.

Chemical Purge Minimizes Effects of Contaminants
In environments with high concentrations of chemicals and cleaning agents, chemical purge option helps to maintain measurement accuracy between calibration intervals.
Chemical purge involves heating the sensor to remove harmful chemicals. The function can be initiated manually or programmed to occur at set intervals.

Graphical Display of History and Measurement Trends
The HMT330 can be ordered with a large numerical and graphical display, which allows the user to clearly monitor operational data, measurement trends and 1-year measurement history. The optional data logger with real-time clock makes it possible to generate over four years of measured history, and zoom in on any desired time or time frame. The battery backup of the clock guarantees a reliable logging of measured data.
The display alarm allows tracking of any measured parameter, with a freely configurable low and high limit.

Data Collection and (Wireless) Transfer to PC
The recorded measurement data can be viewed on the display or transferred to a PC with Microsoft Windows® software. The transmitter can also be connected to a network with an optional (W)LAN interface, which enables a (wireless) Ethernet connection. A USB-RJ45 cable makes it easy to connect the service port of the HMT330 to a PC.
Many Ways to Install and Versatile Outputs
Mains and DC power options, and several mounting accessories make the instrument easy to install.
The HMT330 can have up to three analog outputs. Isolated galvanic power supply and relay outputs are also available. For serial interface the USB connection, RS232 and RS485 can be used.
HMT330 is also capable in applying the MODBUS communication protocol and together with an appropriate connection option provides either MODBUS RTU (RS485) or MODBUS TCP/IP (Ethernet) communication.

Flexible Calibration

The HMT330 instruments are calibrated at six humidity points at the factory. A quick, one-point field calibration can be performed with the hand-held HM70 meter.
A two-point field calibration can be performed with the HMK15 salt bath calibrator in a controlled environment. The transmitter can be sent to Vaisala for recalibration. Accredited calibrations and maintenance contracts are also available.


Types Of Humidity Products - Fixed Installations/OEM Products

  • HMT330

  • HMT360

  • HMT310

  • HMDW80

  • HMT120/130

  • HMW90

  • HMDW110

  • HMS110

  • HMS80

  • HMP60

  • HMP110

  • HMM100

  • HMP3

  • HMP4

  • HMP5

  • HMP7

  • HMP8

  • HMP9

  • INDIGO 200

  • INDIGO 520

  • TMP1

  • HMM170

  • HMD60