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NPN proximity sensors provide an active LOW output. This means that when an object enters the detecting range of the sensor, the output of the sensor is connected with the ground. This type of sensor is also known as a 'sinking' sensor.
This Inductive Proximity Sensor NPN can be used for metal detectors, traffic lights, car washes, and a host of other projects.
Power: 6-36VDC
Output Current: 300mA
Detection Range: 4mm
Detected material: Iron/Steel alloys
43in. Lead. Includes Hardware.
Dia: 12mm L: 64mm WT: .08
The brown pin is the positive voltage pin. Input voltage: 6V-36V. The blue pin is the ground pin. The black pin is the signal pin. When the proximity sensor doesn't detect any metal objects, this pin will be LOW, about 10 times less than the voltage that is fed to the positive voltage pin, the brown pin.
For example, if you are feeding a voltage of 5V into the brown pin when no metal objects are detected, the black pin will output about 0.5V or less.