Heated Humidity Sensor for Radiosondes


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).

HMC03M heated humidity sensor

Response time for HMC03M

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.

Key Features

  • 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

Nominal capacitance C0 (at 30 °C / 86 °F)
120 ± 40 pF
Sensitivity (for C0 = 120 pF, in average)
0.41 pF / % RH
Response time t63 (see Graph for details)
< 8 sec. at -30 °C (-22 °F)
< 11 sec. at -40 °C (-40 °F)
Working range temperature
-80...60 °C (-112...140 °F)
Working range humidity
0...100 % RH
Linearity (0...98% RH)
< ± 2 % RH

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