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What problems need to pay attention to using capacitive sensors

Capacitor sensors are a conversion device that uses various types of capacitors as sensor components to replace the measured physical quantity or mechanical amount into a change in electrical capacity. What problems should we pay attention to when using a capacitive sensor?

1. The theory of the capacitive sensor can detect any object. When the object that detects the high -agent constant is detected, the detection distance is greatly shortened, and it will not be effective even if the sensitivity is increased.

2. When using sensual loads (such as lamps, motors, etc.), the transient impact current is large, which may cause the AC second -tier capacitor type to be close to the switch to deteriorate or damage. In this case, a intermediate relay should be added as a conversion load.

3. DC second -line system is close to the switch static leakage current of 0.5 ~ 1mA. In some occasions that are close to the leakage current of the switch, the DC three -line system should be used to close the switch to improve its anti -interference performance.

4. The capacitive type is close to the switch in the DC magnetic field environment above 0.02T, otherwise it will occur.

5. Due to the great influence of factors such as moisture and dust, the capacitive sensor should be maintained regularly, including the detection objects and changes in the installation position close to the switch. The wiring is poorly exposed to the connection part, and there is dust adhesion.

6. Avoid the use of capacitive type near switch in chemical solvents, especially in a strong acid and alkali environment.