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What is proximity sensor ? State its four applications.

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Proximity sensors are input devices that detect presence of an object without physical contact. Inductive and capacitive proximity sensors are popularly used in industrial applications. 

Applications: 1) Gear teeth sensing 2) Sensing presence of object on conveyor e.g. bottle filling plant 3) Sensing position of a piston in pneumatic cylinder 4) Sensing level of fluid in a bottle 5) Sensing moving object inside a pipe 6) RPM measurement

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