Humidity and Temperature Meter Series HMT330

Measure humidity in harsh environments with the instrument you can depend on. The Vaisala HUMICAP® Humidity and Temperature Transmitter Series HMT330 is designed for demanding industrial applications where stable measurements and extensive customization are essential.

Looking for HMT330 performance with interchangeable probes and a transmitter supporting two probes? View Indigo family. To learn more about the differences between HMT330 and the Indigo platform, view this comparison sheet for details.

There are six models to choose from:

  • HMT331 for wall mounting, see also HMP1
  • HMT333 for duct mounting and tight spaces, see also HMP3 and HMP9
  • HMT334 for high pressures up to 100 bar and vacuum conditions, see also HMP4
  • HMT335 for high temperatures, see also HMP5
  • HMT337 for high humidity and meteorological applications, see also HMP7
  • HMT338 for pressurized pipelines up to 40 bar, see also HMP8

The instrument can be quickly tailored to meet the specific needs of each individual application and is pre-configured for each delivery.


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
Excellent performance in harsh conditions; good chemical tolerance
Corrosion-resistant IP65/IP66 housing
Traceable calibration for measurement and analog outputs (certificates included)
Optional graphical display and keypad for convenient operation
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Key Benefits

Reliable and stable
Accurate and stable measurement even in demanding conditions gives reliable data. The construction of the transmitter is suitable for the heavy duty in industrial applications.
Configurable and ready for installation
The product is assembled and configured to your needs, delivered within days to your facility, and fully ready for installation. The user interface is multilingual and available in English, German, French, Japanese and Chinese.

Watch the video

Learn how to replace the HMT330 transmitter with Indigo520

Product Resources

Download Humidity eGuide for Smart Industries

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Smart Measurements for Smart Industries – Humidity Measurement in Industrial Applications

Smart measurements for smart industries – humidity measurement in industrial applications

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Drop on a green leaf -humidity

Humidity calculator

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Sanna Lehtinen calibrating HMT330 with HM70 Hand-Held

One-point in-situ calibration – the fast, easy option

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Lars Stormbom

Saturated salt calibration with the Vaisala HMK15 – another easy option

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Customer Stories

The Vasa ship capsized and sank in Stockholm 1628.
Customer case

Creating the right climate

Vaisala humidity transmitters help to preserve the royal warship Vasa Saving the famous 17th century Swedish warship, Vasa, from further...
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