Questions about our products?

HMC03M is optimized for short response time even at very low temperature in the upper atmosphere. It combines on a silicon substrate a capacitive relative humidity sensor and a heating resistor (heater).

The heater is dedicated for fast recovery of the humidity sensor after condensation or icing. This leads to outstanding measuring performance in high-end weather observation.


  • Very short response time even at low temperature
  • Fast recovery after condensation or icing due to sensor heating
  • High sensitivity and outstanding linearity

Technical data

  • 120 ± 40 pF

    Nominal capacitance C0 (at 30 °C / 86 °F)
  • 0.41 pF / % RH

    Sensitivity (for C0 = 120 pF, in average)
  • < 8 sec. at -30 °C (-22 °F)
    < 11 sec. at -40 °C (-40 °F)

    Response time t63 (see Graph for details)
  • -80...60 °C (-112...140 °F)

    Working range temperature
  • 0...100 % RH

    Working range humidity
  • < ± 2 % RH

    Linearity (0...98% RH)

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HMC03M Datasheet
(646.7 kb)


  • What is the difference between a 2 wire and a 3 wire current output?

    Transmitter with "two-wires" technology receive the power from the process, and the signal is carry on return wire (closed current loop). With technology "three-wires" the power supply is separate from current output: 2 wires are the power supply and third carry the signal.