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Aluminium Oxide Humidity Sensor

The aluminium oxide (AL2O3) dampness sensor offers precise perseverance of dew stage, frost point, ppm, or relative humidity in most industrial gases. of the aluminum oxide sensor is that its capacitance differs with the dampness focus. The sensor is able of each ppm and dew level measurements in most industrial gas streams. The electronics are mounted internally and procedure the signal from the sensor and screen the readings on the entrance display panel.

Aluminium Oxide Moisture Sensor Principle
An aluminum layer on a ceramic assistance is anodized to type a slender porous layer of aluminum oxide. The aluminum oxide is then coated with a thin, permeable layer of gold. The gold and the aluminium layers form the sensor electrodes.

Figure 1. Cross-area of aluminium oxide sensor.

The gold layer is permeable to moisture and conductive. This types the 2nd electrode of a capacitor.

The pores in the aluminium oxide layer take up moisture from the gas stream in amounts immediately proportional to the dampness material of the fuel stream.

Figure two. Near-up check out of aluminium oxide sensor.

The absorption of water molecules adjustments the capacitance of the sensor. The capacitance of the sensor is calculated which is then transformed to the humidity benefit.

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

Employs of the Aluminium Oxide Sensor
The aluminium oxide sensor is appropriate for use on nearly any application exactly where dampness measurements are required.

Industrial applications for humidity analyzers tumble into two locations:
Gas Producers: for guaranteeing solution top quality
Fuel End users: to make sure trustworthiness of inert gas blankets.
Typical industries necessitating the use of moisture measurement tools are Semiconductor, Metallic Treatment method, and Plastics.

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