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Humidity & Temperature Meter Series HMT 330






  • HMT330 Series Humidity and Temperature Transmitters for Demanding Humidity Measurement.

  • Excellent Performance

  • Corrosion Resistant

  • 5-Point Calibration


The Vaisala HUMICAP® Humidity and Temperature Transmitter Series HMT330 is designed for demanding industrial applications where stable measurement and wide customization is important. With multiple options to choose from, the instrument can be tailored to meet the specific needs of each individual application and is pre-configured for each delivery.

The HMT330 series includes six models:
♦    HMT331 for wall-mounted applications
♦    HMT333 for ducts and tight spaces
♦    HMT334 for high-pressure and vacuum applications
♦    HMT335 for high-temperature applications
♦    HMT337 for high-humidity applications
♦    HMT338 for pressurized pipelines


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
♦    4th generation Vaisala HUMICAP® sensor for superior accuracy and stability
♦    Optional graphical display and keypad for convenient operation
♦    Multilingual user interface
♦    Excellent performance in harsh conditions; good chemical tolerance
♦   Corrosion-resistant IP65/IP66housing
♦    5-point calibration


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HMT330 Series Humidity and Temperature Transmitters




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.

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.