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Vaisala HMT310 Series Humidity and Temperature Transmitter

condition: Brand NewPart #: VA-HMT310Availability: Ships within 2-4 weeks
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Reliable Vaisala HUMICAP® Technology
The HMT310 incorporates the latest generation Vaisala HUMICAP® Sensor. The Vaisala HUMICAP® Sensor is a capacitive thin-film polymer sensor. It features high accuracy, excellent long-term stability and negligible hysteresis. It is insensitive to dust, particulate dirt and most chemicals.

Several Outputs, One Connector
The HMT310 is powered up with 12 ... 35 VDC. It has two analog outputs and an RS-232 serial output. The output signal and the supply power travel in the same cable, the only cable connected to the unit.

Chemical Purge
Chemical purge helps to maintain measurement accuracy between calibraton intervals and it involves heating the sensor to remove harmful chemicals. The function can be initiated manually or programmed to occur at set intervals.

Optional Functions
The following optional functions are available: several probes for various applications, calculated humidity quantities, different mounting kits, sensor protection options and probe cable lengths, warmed probe and sensor heating for high humidity conditions (HMT317), and chemical purge for applications risking an interference with chemicals in the measuring environment.

  • Six models for demanding applications:- HMT311 for wall mounting
    – HMT313 for duct mounting and tight spaces
    – HMT314 for high pressures up to 100 bar and vacuum conditions
    – HMT315 for high temperatures
    – HMT317 for high humidity applications, warmed probe option
    – HMT318 for pressurized pipelines up to 40 bar
  • Next-generation Vaisala HUMICAP® Sensor for excellent accuracy and stability
  • Full 0 … 100 %RH measurement, temperature range up to +180 °C (depending on model)
  • Small size, easy to integrate
  • Insensitive to dust and most chemicals
  • NIST traceable

Relative Humidity Measurement

Measurement Range 0 … 100 % RH
Accuracy at +20 °C (68 °F) ± 1.0 % RH (0 … 90 % RH)

± 1.7 % RH (90 … 100 % RH)


Sensor Typical Applications Vaisala HUMICAP® 180R
Sensor applications with chemical purge and/or warmed probe Vaisala HUMICAP® 180RC

Temperature Measurement

Measurement Range
HMT311  -40 … +60 °C (-40 … +140 °F)
HMT313  -40 … +80 °C (-40 … +176 °F) or

-40 … +120 °C (-40 … +248 °F)

HMT314, HMT315, HMT317, HMT318  -70 … +180 °C (-94 … +356 °F)

Electrical Connections

Two analog outputs, selectable and scalable 0…20 mA or 4…20 mA
Serial Output RS-232C
Operating Voltage 12 … 35 VDC, 24 VDC
Power Consumption 30 mA with RS-232


Operating Temperature Range for Electronics -40 …+60°C (-40…+140°F)
Operating Pressure
HMT314 0…100 bar
HMT318 0…40 bar
HMT315, HMT317 vapor tight
Storage Temperature Range -55…+80°C (-67…+176°F)
Transmitter Housing Material G-AlSi10Mg
Transmitter Base Material ABS/PC
Housing Classification IP65
Sensor Protection PPS grid with stainless steel net

PPS grid, Sintered filter

Membrane stainless steel filter

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