HMC03M Heated Humidity Sensor for Radiosondes and Weather Balloons
HMC03M is optimized for short RH response time even at very low temperature in the upper atmosphere. It combines on a silicon substrate a capacitive relative humidity (RH) sensor and a heating resistor (heater). The heater is dedicated for fast recovery of the humidity sensor after condensation or icing. The construction with the heater positioned all around the RH sensor grants uniform temperature throughout the HMC03M structure, which leads to outstanding measuring performance in high-end weather observation.
Very short RH response time at low T High sensitivity Fast recovery after condensation or icing due to sensor heating High accuracy thanks to outstanding T uniformity within HMC03M
Humidity sensor Nominal capacitance C0 (at 30 °C / 86 °F) 120 ± 40 pF Sensitivity 0.41 pF / % RH Working range humidity 0...100 % RH temperature -80...60 °C (-112...140 °F) Linearity error (0...98 % RH) < ± 2 % RH Hysteresis 1.9 ± 0.25 % RH
Temperature dependence1) dC = -0.0014*RH*(T-30 °C) [pF] Loss tangent < 0.05 Supply voltage 5 V max (UPP) DC voltage < 5 mV Operating frequency 10...100 kHz, recommended 20 kHz