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Humidity transmitter - Advanced

Vaisala HMT330 series are easy-to-use transmitters for demanding industrial and air conditioning applications. The transmitters measure relative humidity and temperature and from these calculate dew point and wet bulb temperature, mixing ratio and absolute humidity. They can be configured to the customer's requirements on the production line, but configuration and parameters can also be set by the user. The series has both analogue and serial outputs as well as several options: different cable lengths, power supply modules and serial interface modules as well as a local display.

Technical Specs

Model HMT330
Measurement Range Humidity: 0 - 100% rH
  • HMT331: -40 to 60ºC
  • HMT333: -40 to 80ºC or -40 to 120ºC
  • HMT334/335/337/338: -70 to 180ºC
    Dewpoint, mixing ratio, absolute humidity, wet bult temperature, enthalpy, water vapor pressure
  • Sensor Humidity: Vaisala HUMICAP 180
    Temperature: PT100 RTD
    Accuracy at 20ºC Humidity: ±1.0%rH (0 - 90%rH), ±1.7%rH (90 - 100%rH)
    Temperature: ±0.2ºC
    Power supply 10-35 VDC / 24VAC
    Output 0-20mA, 4-20mA, 0-1V, 0-5V, 0-10V, RS-232, RS-485(optional)
    Mechanics Protection: IP65 (NEMA 4)
    Display: One line, changing or fixed variables
    Remarks HMT331 for wall mounting
    HMT333 for duct mounting and tight spaces
    HMT334 for high pressures up to 100 bar and vacuum conditions
    HMT335 for high temperatures
    HMT337 for high humidity and meteorological applications
    HMT338 for pressurized pipelines up to 40 bar

    Data sheet

    CatalogueProduct Selection Form

    See also
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    The wall-mounted Vaisala GMW90 Series CARBOCAP® Carbon Dioxide, Temperature and Humidity Transmitters are intended for demand controlled ventilation applications. They measure carbon dioxide and tempe.....
    Humidity and Temperature Transmitters for High-Accuracy Measurements in HVAC Applications
    ​Vaisala HUMICAP® Humidity and Temperature Transmitter Series HMDW110 measure relative humidity and temperature in multiple HVAC applications. The series includes transmitters for duct mounting,.....
    Humidity Transmitter
    The current loop-powered, two-wire transmitter is called the Vaisala HMT120 and the three-wire transmitter - with voltage and serial line outputs as well as a relay - is called the Vaisala HMT130. The.....


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