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Capacitive proximity switch

Such measurements are usually form a capacitor plate of the switch, and the other electrode is switched enclosure. The shell in the measurement process is usually grounded or is connected with the casing of the device. When you move the object to the proximity switch, regardless of whether it is a conductor, due to its proximity, always make the capacitor's dielectric constant change, so as to bring about changes in capacitance, and the circuits connected to the measuring head has changed, which will optimize the control switch connecting or disconnecting. This proximity sensors to detect objects, not limited to conductors, such as insulation of liquid or powder.

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