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Sensors & Transmitters
   Data Acquisition
   pH and ORP
   Relative Humidity / Dewpoint
     RH Fixed Installation
       HMT330 Industrial Series
       HMT360 Intrinsically Safe
       HMD60 & HMD70 - Duct Mount
       HMW60 & HMW70 - Wall Mount
       HMDW82/83 Duct & Wall Mount
       HMW90 Wall Mount
       DMT340 Dewpoint - Industrial
       DMT345/346 Dewpoint - Industrial
       DMW19 Dewpoint - Wall Mount
     RH Portable Instruments
     Probes and OEM Modules
   Differential Pressure
   Carbon Dioxide
   Nitrogen Dioxide
   Carbon Monoxide
   Smoke Detectors
   Current Sensors
   Proximity Sensors
   Photoelectric Sensors
   Safety Light Curtains
   Cables and Distribution Boxes
   Oxygen Transmitters


Tel: 1-925-706-7433

Vaisala HMT360 Humidity and Temperature Transmitter - Intrinsically Safe
Vaisala Instruments

HMT360 Series Intrinsically Safe Humidity and Temperature Transmitters


Vaisala's HMT360 humidity and temperature transmitter is designed for use in potentially explosive atmospheres. The electronics are designed so that the fully configurable transmitter is intrinsically safe. The microprocessor-based HMT360 is easy to install, maintain and calibrate due to its modular structure. The interchangeable probes are easy to remove and enable on-site calibration. They make the HMT360 series versatile and ensure its suitability for almost any application.

  • Intrinsically safe - the whole transmitter can be installed into the explosive area
  • Complies with classifications from PTB (CENELEC, Europe), FM (USA), CSA (Canada), TIIS (Japan), Russia (STV) and PCEC (China)
  • The interchangeable probe module contains all calibration coefficients, so a calibrated probe can be switched in the field without the need to input any data manually
  • Complies with FM (USA), VTT (CENELEC, Europe), CSA (Canada), TIIS (Japan), Russia (STV) and PCEC (China), VTT (IECEx)
  • Five interchangeable probe models for a variety of applications:
    • HMT361 for wall mounting
    • HMT363 for duct mounting and tight spaces
    • HMT364 for high pressures up to 100 bar and vacuum conditions
    • HMT365 for high temperatures
    • HMT367 for high humidities
    • HMT368 for pressurized pipelines up to 40 bar
PDF File HMT 360 Technical Data
PDF File Probe Order Guides
Relative humidity measurement

Measurement rannge

0 ... 100 % RH

Accuracy at +20 °C (68 °F) ± 1.0 % RH (0 ... 90 % RH)
Accuracy at +20 °C (68 °F) ± 1.7 % RH (90 ... 100 % RH)
Sensor (general use) HUMICAP® 180 and HUMICAP® 180R
Sensor (demanding chemical environment) HUMICAP® 180L2
Temperature measurement

Measurement range
     HMT364 / 365 / 367 / 368

-40 ... +60 °C (-40 ... +140 °F)
-40 ... +120 °C (-40 ... +248 °F)
-40 ... +180 °C (-40 ... +356 °F)

Typical accuracy of electronics at +20 °C (68 °F) ± 0.2 °C (± 0.36 °F)
Sensor Pt 1000 RTD 1/3 Class B IEC 751
Other optional variables available

Dewpoint temperature, mixing ratio, absolute humidity, wet bulb temperature.

Operating environment

     for electronics
     with display

-40 ...+ 60 °C (-40 ... +140 °F)
-20 ...+ 60 °C (-4 ... +140 °F)
-40 ...+ 70 °C (-40 ... +158 °F)

Inputs and outputs

Operating voltage
     with serial port (servicemode)

12 ... 28 V
15 ... 28 V

Analog outputs two-wire 4 ... 20 mA, one standard, one optional
Digital outputs RS-232C serial output for service use

Weight (housing)

950 g

Material (housing) G-AlSi 10 Mg (DIN 1725)
Housing classification IP66 (NEMA 4X)
Options and accessories

Additional analog output

4 ... 20 mA

Duct mounting installation kit (for HMP363/367) 210697
Installation flange (for HMP365) 210696
Ball valve set (for HMP368) BALLVALVE-1
Serial interface cable for PC 25905ZZ
Protection cover 214101 (for use in the presence of combustible dust)
Galvanic isolator 212483
Zener barrier (USA & Canada) 210664

HMT360 Intrinsically Safe

  HMT361 RH & T Transmitter for wall mounting
Code: VIHMT361
Price: $2,340.00
Quantity in Basket: none

  HMT363 RH & T Transmitter for duct mounting and tight spaces
Code: VIHMT363
Price: $2,680.00
Quantity in Basket: none

  HMT364 RH & T Transmitter for high pressure and vacuum
Code: VIHMT364
Price: $3,490.00
Quantity in Basket: none

  HMT365 RH & T Transmitter for high temperatures
Code: VIHMT365
Price: $3,120.00
Quantity in Basket: none

  HMT367 RH & T Transmitter for high humidities
Code: VIHMT367
Price: $3,120.00
Quantity in Basket: none

  HMT368 RH & T Transmitter for pressurized pipelines
Code: VIHMT368
Price: $3,320.00
Quantity in Basket: none

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