Starting at $1,068.00

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  • 0 to 100% RH measurement, temps up to 180°C
  • Small size, easy to integrate
  • Insensitive to dust and most chemicals
  • NIST traceable calibration (certificate included)
  • Highly customizable

The Vaisala HMT310 humidity and temperature transmitter is a compact instrument designed for demanding industrial applications where stable measurement and wide customization is important. It features several probe options for different application needs, and excellent stability of measurement.

The HMT310 incorporates the latest generation Vaisala HUMICAP sensor. The sensor is a capacitive thin-film polymer sensor providing high accuracy, excellent long-term stability and negligible hysteresis. It is insensitive to dust, particulate dirt and most chemicals.

The Vaisala HMT310 humidity and temperature transmitter is powered with 10 to 35 VDC. It has two analog outputs and an RS232 serial output. The output signal and the supply power travel in the same cable, the only cable connected to the unit.

In environments with high concentrations of chemicals and cleaning agents, chemical purge helps to maintain measurement accuracy between calibration intervals. Chemical purge involves heating the sensor to remove harmful chemicals. The function can be initiated manually or programmed to occur at set intervals.

The Vaisala HMT310 is available with a range of options to customize each instrument to its application. The HMT310 is available with a number of probe options, calculated humidity quantities, variety of mounting kits, sensor protection options and probe cable lengths, warmed probe and sensor heating for high humidity conditions, and chemical purge for applications risking an interference with chemicals in the measuring environment.

The probe options available for the HMT310 include:

  • HMT311 for Wall-Mounted Applications
  • 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


Vaisala DRW216050 Interface Cable
6.5ft (2m) cable for calibration and adjustment of Vaisala instruments that use the MI70 indicator
Vaisala 238607 USB Cable
5ft (1.5m) cable with RJ45 to USB connectors, includes driver software on CD


Vaisala MI70LINK Software
Vaisala MI70LINK Software with USB or serial port cable
In Stock


Please consider these optional accessories.

Vaisala HM47280SP Sintered Filter
12mm diameter, female thread, stainless steel with 38µm pore size
Vaisala HM47453SP SS Filter Guard
12mm diameter, female thread, with 3.15mm holes for oil and air/gas measurements in vacuum environments less than 7.25 psi (0.5 bar)
Vaisala DRW010281SP PPS Grid
12mm diameter, female thread, metallized PPS plastic grid with stainless steel mesh with 15µm pore size
Vaisala DRW010276SP Plastic PPS Grid Filter
12mm diameter, female thread, metallized PPS plastic with 6.5mm gaps between grids
Vaisala SWG12NPT12 Swagelok
Fitting for 12mm diameter probe with 1/2in NPT male thread, rated for up to 145 psi (10 bar)