HMT330 Series Humidity and Temperature Transmitters for Demanding Humidity Measurement

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Measure humidity in harsh environments with the best-in-class transmitter you can truly depend on.

The Vaisala HUMICAP® Humidity and Temperature Transmitter Series HMT330 is ideal for applications where stable measurement is essential.

10-year warranty proves the outstanding reliability. With multiple options to choose from, the instrument can be tailored to meet the specific needs of each individual application.

Six models for demanding applications

  • 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

HMT330 Series Humidity and Temperature Transmitters for Demanding Humidity Measurement

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Vaisala Warranty & Support

All Vaisala products and services are protected by full, 12-month warranty coverage as the standard minimum, with selected products being covered for up to 24 months. During the warranty period customers benefit from free repair or, where required, replacement. Standard repair lead times apply unless otherwise agreed.

Please contact Automatic Controls Company with any inquiries regarding warranty claims, repairs, service contracts, calibrations, or spare parts.

Extended Warranty

An extended warranty from Vaisala ensures repair or replacement of equipment for five years, guaranteeing optimal system performance and eliminating costly and inconvenient delays caused by repair or replacement quotation and approval processes.

Extended warranties are available for both new or previously purchased Vaisala products, though previously purchased products may require baseline calibration.

For more details on Vaisala warranty services, or if you are interested in customized or long-term warranty and priority service scheduling, please contact Vaisala Sales to discuss your needs.

Technical Support

Chat with us or call (502) 266-6640.

Operating Principle

HUMICAP is a capacitive thin-film polymer sensor consisting of a substrate on which a thin film of polymer is deposited  between two conductive electrodes. The sensing surface is coated with a porous metal electrode to protect it from contamination and exposure to condensation. The substrate is typically glass or ceramic. The thin-film polymer either  absorbs or releases water vapor as the relative humidity of the ambient air rises or falls. The dielectric properties of the polymer film depend on the amount of absorbed water. As the relative humidity around the sensor changes, the dielectric properties of the polymer film change, and so does the capacitance of the sensor. The instrument’s electronics measure the capacitance of the sensor and convert it into a humidity reading.

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