HS20 Relative Humidity (RH) Sensor

Telaire HS20 is a bulk-resistance type of Relative Humidity (RH) Sensor providing a variable impedance value in response to the adsorbed water within the sensor’s proprietary thin-film polymer. Applied to an interdigitated electrode, the polymer’s chemical functional groups disassociate into ionic groups in the presence of water, increasing the sensor’s electrical conductivity. Excited by a low voltage alternating current, the sensor’s resulting impedance is measured via supporting circuitry.

General	Min	Typical	Max	Condition
Storage Temperature	0°C		50°C
Storage Humidity	20%RH		90%RH	Without condensation
Operating Humidity	30%RH		90%RH	Do not allow dewdrops to form.
Operating Temperature	0°C		50°C
Power Rating	AC 1V			50Hz - 1KHz
Nominal Impedance Value		67.3 kΩ		25°C, 50%RH
Tolerance on Impedance Value	53.9 kΩ		70.7 kΩ

Reliability	Criteria	Condition
Dry Heat Storage	<±5 %RH	85°C, 1000 hours
Cold Storage	<±5 %RH	-40°C, 1000 hours
Damp Heat Storage	<±5 %RH	65 ±5°C, 90%RH, 1000 hours
Heat Cycle Test	<±5 %RH	-40°C~85°C, 100 cycles
Low Humidity Storage	<±5 %RH	20°C, 20%RH, 1000 hours
Dry Heat Operation	<±5 %RH	80°C, 1000 hours, AC 1V, 1KHz

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Telaire HS20

Relative Humidity Sensor

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