HMT363 Intrinsically Safe (Ex ia) Humidity and Temperature Transmitter for Duct Mounting - Vaisala Online Store

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HMT363 Intrinsically Safe (Ex ia) Humidity and Temperature Transmitter for Duct Mounting

The HMT363 is the top-of-the-line duct-mounted intrisincally safe transmitter. In addition to displaying humidity and temperature readings, the HMT363 calculates dew point, absolute humidity, wet bulb temperature, and mixing ratio. The Vaisala HUMICAP® Humidity and Temperature Transmitter HMT360 series incorporates Vaisala’s 30 years of experience in industrial humidity measurement.

The transmitter has a large display for convenient monitoring of the reading and transmitter setting changes. For example scaling can easily be changed by the user.

Analog outputs are preset at the factory to:

  • Channel 1: 4…20 mA = -40...+100°C (-40...+212°F) Td
  • Channel 2: 4...20 mA = -40...+80°C (-40...+176°F) T

Safe operation with the entire transmitter in hazardous areas: Div I and II (USA, Canada), Categories 1G/Zone 0 and 1D/Zone 20 with protection cover (EU).

In order to achieve a safe installation, each 4-20 mA output requires an external intrinsically safe electrical surge barrier. Surge barriers should be located outside the hazardous area in a general purpose electronics enclosure. Each 4-20mA loop will require a separate barrier.

See all HMT360-series Exi transmitters

The package includes:

  • Compact probe with 2 m (6.5 ft) cable
  • Calibration certificate (ISO9001 compliant, traceable)
  • Duct Installation kit
  • NPT1/2" conduit fitting included to facilitate wiring
  • User's Guide in English

HMT363 Intrinsically Safe (Ex ia) Humidity and Temperature Transmitter for Duct Mounting
HMT360-series: HMT363 Intrinsically Safe Humidity and Temperature Transmitter for Duct Mounting
Standard delivery time for single unit: 1 week
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Warranty: 24 months
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Detailed information

Measurement parameter(s)Relative humidity
Absolute humidity
Dew point
Wet bulb
Mixing ratio
Measurement range0 ... 100 % RH
-40 ... +80 °C (-40 ... +176 °F) T
Measurement accuracyAt temperature +20 °C (68 °F):
± 1.0 % RH (0 ... 90 % RH)
± 1.7 % RH (90 ... 100 % RH)
± 0.2 °C (± 0.36 °F) T
Operating temperaturefor electronics -40 ...+ 60 °C (-40 ... +140 °F)
with display -20 ...+ 60 °C (-4 ... +140 °F)
storage -40 ...+ 70 °C (-40 ... +158 °F)
Operating voltage12 ... 28 V
Analog outputstwo-wire 4 ... 20 mA x2
Digital outputsRS-232C
Housing classificationIP66 (NEMA 4X)
Links See full specifications on
Download user guides and other product documents on

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