4 wire proximity switch

4 Wire Proximity Sensor DMS Engineer. Wiring of 4 wire Proximity sensors: To understand the 4 wire sensor wiring mechanisms we will try to solve an example. 4 wire type NPN. In the above example, two loads (devices) are connected to the same sensor. When any conductive object (or any detectable object) comes nearer to the sensor one load turns on that is connected to the NO terminal and 2nd load turns on when the object goes far or out of range.

4 Wire Proximity Sensor DMS Engineer
4 Wire Proximity Sensor DMS Engineer from i5.walmartimages.com

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