Pro-Range RM18 8mm NPN Inductive Proximity Sensor DC6-36V (Unshielded) w/ 6m Cable

Unshielded (non-flush) mounting allows the sensor to achieve its full 8mm nominal sensing range but requires lateral clearance from surrounding metal structures—typically a distance equal to the sensor's diameter. Shielded (flush-mount) sensors can be installed flush with metal but have a reduced sensing range. This RM18 model is unshielded.

Connect the brown wire to your DC positive supply (6-36V), the blue wire to DC negative (0V/GND), and the black wire is the NPN switched output. For a PLC with sinking inputs, connect the black wire to the input terminal. For an Arduino, connect the black wire to a digital input pin and use a pull-up resistor to VCC, as the NPN output sinks current to ground when active.

Yes, inductive proximity sensors detect all conductive metals, but the sensing distance is reduced for non-ferrous targets. For this 8mm-rated sensor, the effective sensing distance for aluminum is approximately 60-70% of the rated value (around 5-5.6mm). Always verify detection in your specific application with the actual target material.

Typical specifications for this sensor class are a maximum load current of 200mA and a voltage drop (saturation voltage) of less than 1.5V across the output transistor when switched on. Always ensure your load (e.g., PLC input, relay coil) does not exceed the sensor's maximum current rating.