What is Proximity Sensor?

What is Proximity Sensor? Magnetic Ultrasonic Sensing Device
Non-Contact Sensing Device

     A non-contact sensing device used to -sense when objects are a short distance away, and determine the distance of the, object. Several types include: radio frequency, magnetic bridge, ultrasonic, and photo-electric. Commonly used for: high speed counting, sensing metal objects, level control, reading coding marks, and limit switches. See Acoustic Proximity Sensor, and Inductive Sensor.

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What is Proximity Sensor? Magnetic Ultrasonic Sensing Device