Telaire HS20 | Relative Humidity Sensor

Telaire Relative Humidity Sensor HS20

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.

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Applications

HVAC controls
White goods
Handheld instruments
Medical devices
Wireless transmitters
Asset monitoring
Data loggers
Consumer goods
Automotive climate control
Agriculture and horticulture
Environmental chambers
Enthalpy measurement

Features

Low cost
Low power
Inverse exponential humidity response curve
Fast response time
Exceptional linearity
Low hysteresis
Excellent interchangeability
Simple signal conditioning circuitry
Wide operating range
Small size

Specifications

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