The FK120J (humidity only) / TFK120J (humidity and temperature) sensor measures the air humidity by means of a humidity-dependant condenser.
The capacitive humidity measuring element, produced using thin-film technology, consists of a base plate, on which the electrodes are housed, and a hygroscopic polymer layer above it.
The hygroscopic polymer layer absorbs water molecules from the medium to be measured (air) or releases them, thereby altering the capacity of the condenser.
In a tandem-arranged electronic device, the change in capacity is processed via integrated signal preprocessing into standardised signals 0…20mA or 0…10VDC or 4…20mA.
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