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HMT330 Series Humidity and Temperature Transmitters for Demanding Humidity Measurement

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

RELATIVE HUMIDITY

Measurement range 0 ... 100 %RH

Accuracy (including non-linearity, hysteresis, and repeatability)

with Vaisala HUMICAP® 180 or 180R*                      for typical applications

with Vaisala HUMICAP® 180C or 180RC*                  for applications with chemical purge/warmed probe

with Vaisala HUMICAP® 180VC                                catalytic sensor with chemical purge for H2O2

                                                                             environments

at +15 ... +25 °C (59 ... +77 °F)                ±1 %RH (0 ... 90 %)

                                                                ±1.7 %RH (90 ... 100 %RH)

at -20 ... +40 °C (-4 ... +104 °F)                ±(1.0 + 0.008 x reading) %RH

at -40 ... +180 °C (-40 ... +356 °F)            ±(1.5 + 0.015 x reading) %RH

Factory calibration uncertainty (+20 °C)      ±0.6 %RH (0 ... 40 %RH)

                                                                ±1.0 %RH (40 ... 97 %RH)


(Defined as ±2 standard deviation limits. Small variations possible; see also calibration certificate.)

Response time (90%) at +20 °C (+68 °F)              8 s/17 s** with grid filter

in still air                                                            20 s/50 s** with grid + steel netting filter

                                                                         40 s/60 s** with sintered filter

*HUMICAP 180R or 180RC recommended

** with HUMICAP 180R or 180RC or 180VC sensor


TEMPERATURE

Accuracy at +20 °C (+68 °F)               ± 0.2 °C (± 0.36 °F)

Accuracy over temperature range (measurement range depends on model)


Temperature sensor Pt100 RTD Class F0.1 IEC 60751

Other available variables (model-dependent) dew point temperature, mixing ratio, absolute humidity, wet

bulb temperature, enthalpy, water vapor pressure