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Clean / Precision Air Conditioning / Local Air Conditioning

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About humidity Sensor

  Swelling formula Electrical resistance type IC sensor Capacitive IC sensor Electromagnetic absorption
Principally a temperature sensor which uses the swelling formula of hair or nylon film etc. The electrode is laid on the base material, and a moisture sensitive polymer containing additives such as ammonium salt is applied on it. The moisture content in the polymer is changed by the water vapour contents of air moisture sensitive measurement, and depending on the moisture content, ions originated from additives are released in order to measure the change in electrical resistance.
(Refer to the figure below)
The electrode is applied to the under side of the base material, and a moisture sensitive polymer coating is applied on top, and further, a breathable mesh like upper electrode is laid on this. Moisture is absorbed by the moisture sensitive polymer, transmitted through the breathable upper electrode depending on the amount of water vapour in the measured air. The dielectric constant of the moisture sensitive polymers which change based on the moisture content above, are measured by the change in capacitance between the upper and lower electrodes.
(Refer to the figure below)
Object which uses the phenomenon of a specific wavelength infrared is absorbed by moisture in the air. Can be measured with high accuracy. Because it is also a optical, and some can also be used in hazardous areas.
In addition to the absolute humidity and relative humidity, Dew point can be measured. Is also expensive
Detection Accuracy ±7~8%RH ±2~5% ±1% ±0.5~1%RH

 

Electrical resistance type IC sensor

Electrical resistance type IC sensor


Capacitive IC sensor

Capacitive IC sensor

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