The aluminium oxide (AL2O3) moisture sensor provides exact resolve of dew stage, frost point, ppm, or relative humidity in most industrial gases.

The functioning theory of the aluminum oxide sensor is that its capacitance varies with the dampness focus. The sensor is capable of equally ppm and dew point measurements in most industrial gas streams. The electronics are mounted internally and process the signal from the sensor and show the readings on the entrance screen panel.

Aluminium Oxide Dampness Sensor Principle

An aluminum layer on a ceramic support is anodized to type a skinny porous layer of aluminum oxide. The aluminum oxide is then coated with a skinny, permeable layer of gold. The gold and the aluminium layers kind the sensor electrodes.

Figure 1. Cross-portion of aluminium oxide sensor.

The gold layer is permeable to dampness and conductive. This sorts the second electrode of a capacitor.

The pores in the aluminium oxide layer soak up humidity from the gasoline stream in amounts directly proportional to the dampness material of the fuel stream.

Determine two. Near-up perspective of aluminium oxide sensor.

The absorption of water molecules changes the capacitance of the sensor. The capacitance of the sensor is calculated which is then converted to the dampness benefit.

The radius of the pores in the aluminium oxide layer make the sensor precise to water molecules.

Employs of the Aluminium Oxide Sensor

The aluminium oxide sensor is appropriate for use on pretty much any software in which humidity measurements are essential.

Industrial applications for dampness analyzers tumble into two areas:

Fuel Producers: for making certain solution quality

Gasoline Consumers: to make sure reliability of inert gasoline blankets.

Standard industries demanding the use of humidity measurement machines are Semiconductor, Metal Cure, and Quartz Crystal Plastics.
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