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The aluminium oxide (AL2O3) humidity sensor delivers exact dedication of dew stage, frost point, ppm, or relative humidity in most industrial gases.
The functioning principle of the aluminum oxide sensor is that its capacitance differs with the humidity concentration. The sensor is able of both ppm and dew point measurements in most industrial fuel streams. The electronics are mounted internally and method the signal from the sensor and display the readings on the front exhibit panel.
Aluminium Oxide Humidity Sensor Concept
An aluminum layer on a ceramic help is anodized to sort a slender porous layer of aluminum oxide. The aluminum oxide is then coated with a skinny, permeable layer of gold. The gold and the aluminium layers form the sensor electrodes.
Figure one. Cross-portion of aluminium oxide sensor.
The gold layer is permeable to dampness and conductive. This sorts the 2nd electrode of a capacitor.
The pores in the aluminium oxide layer take up humidity from the gas stream in amounts straight proportional to the humidity articles of the gasoline stream.
Figure two. Close-up perspective of aluminium oxide
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The absorption of drinking water molecules changes the capacitance of the sensor. The capacitance of the sensor is measured which is then transformed to the humidity price.
The radius of the pores in the aluminium oxide layer make the sensor particular to drinking water molecules.
Makes use of of the Aluminium Oxide Sensor
The aluminium oxide sensor is appropriate for use on nearly any software the place dampness measurements are needed.
Industrial purposes for humidity analyzers tumble into two spots:
Fuel Producers: for making sure merchandise high-quality
Gas Buyers: to ensure dependability of inert gas blankets.
Usual industries demanding the use of humidity measurement machines are Semiconductor, Metal Procedure, and Plastics.
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