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Heated Humidity Sensor for Radiosondes and Weather Balloons - HMC03M

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• Nominal capacitance: 120 ± 40 pF
• Sensitivity: 0.41 pF / % RH
• Working humidity range: 0~100 % RH
• Working temperature range: -80~60 °C (-112~140 °F)
• Linearity error (0~98 % RH): < ± 2 % RH
• Hysteresis: 1.9 ± 0.25 % RH
• Supply voltage: 5 V max (UPP)

Model Number: HMC03M
Data Sheet:

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Product Specification

HMC03M Heated Humidity Sensor Description
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.

HMC03M Heated Humidity Sensor Features
• 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

HMC03M Heated Humidity Sensor Technical Data

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 dependence	dC = -0.0014RH(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
Heater (Molybdenum)
Nominal resistance R₀	100 ± 20 Ohm
Temperature coefficient	3100 ± 150 ppm/K
Self heating coefficient (SHC), typical (at 980 hPa) 5 m/s 1 m/s 0.1 m/s	0.11 K/mW 0.18 K/mW 0.39 K/mW
Max. power	100 mW