What is the difference between NPN and PNP proximity sensors

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PNP sensors are sometimes called “supply sensors,” because the power supply is positive at the output. NPN sensors are called “diving sensors” because they sink at the exit. NPN and PNP are technical terms for the type of transistor used to switch the output.

The PNP and NPN sensors are 3-wire DC devices. The difference is in the type of transistor used in the sensor. The PNP device has 2 power control leads, one connected to the positive one, the other negative. The third thread connects to the load.

The PNP and NPN sensors are 3-wire DC devices. The difference is in the type of transistor used in the sensor. The PNP device has 2 power control leads, one connected to the positive one, the other negative. The third thread connects to the load. The other load conductor connects to the negative pole of the power supply.

On an NPN device, it is also a three-wire device with power cables connected to positive and negative poles of the power supply. The third pipeline here also connects to the load. However, on an NPN device, the residual conductor must be connected to the positive pole of the power supply. If a sensor is connected to a PLC or computer input card, the card serves as a load and will be connected to the positive or negative pole of the power supply and will determine the type of sensor needed to function properly.

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