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HC103M2

HC103M2

Very Fast Humidity Sensor for Radiosondes

Nominal capacitance C0 (at 30 °C / 86°F)

160 ± 40 pF

Sensitivity

0.55 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

Response time RH t63

Temperature dependence

1)

dC = -0.0019*RH*(T-30 °C) [pF]

Loss tangent

< 0.05

Maximum supply voltage

5 V max (VPP)

Maximum DC voltage

< 5 mV

Operating frequency

10...100 kHz, recommended 20 kHz

1) more details for t < -20 °C (68 °F) on request

Technical Data

HC103M2 is a capacitive humidity sensor with very short response

time even at very low temperature. By this, the sensor is ideal for

accurate measurement in the upper atmosphere with radiosondes

and weather balloons.

The sensor is manufactured in state of the art thin film technology

and is appropriate for SMD assembly. The design and the choice of

materials lead to excellent linearity, high sensitivity and reproducible

temperature dependence, which facilitate considerably the design in.

HC103M2 is supplied on tape and reel appropriate for standard

SMD assembly machines.

Radiosondes

Weather observation

Very short response time

High sensitivity and outstanding linearity

Reproducible temperature dependence

Typical Applications

Features

Sensor Characteristic

The average capacitance increases over the working range is

around 55 pF.

The following linear approximation of the caracteristic over the

range 0–98 %RH leads to errors lower than < ±2 %RH.

C(RH) = C0 * [1+HC0 * RH]

with HC0 = 3420 ± 250 ppm /% RH

relative humidity [% RH]

1