SN04-N Inductive Proximity Sensor Switch Module, NPN Normally Open, 5mm Range, IP67

The SN04-N is an inductive proximity sensor designed specifically to detect ferrous metals, such as iron and steel. It will not reliably detect non-ferrous metals like aluminum, copper, or brass unless they are specially treated or have a significant mass. For accurate operation, ensure your target material is a magnetic metal.

Connect the sensor's brown wire to your DC power supply positive (6-36V), the blue wire to ground, and the black wire is the NPN output. For a microcontroller input, connect the black wire to your digital pin and use a pull-up resistor (e.g., 10kΩ) to VCC, or enable the microcontroller's internal pull-up. The output will switch to ground (LOW) when a target is detected.

An NPN normally open (NO) output acts like a switch that is open (off) when no target is present. When a metal target enters the detection range, the internal NPN transistor turns on, closing the switch and connecting the output line to ground. A normally closed (NC) output is the opposite: it is normally connected to ground and opens when a target is detected. Choose NO for applications where an active-low signal indicates detection.

Yes, the SN04-N features an IP67 protection rating. This means it is dust-tight and can withstand temporary immersion in water up to 1 meter deep for 30 minutes. It is suitable for washdown areas, outdoor use, and dusty industrial settings, provided the electrical connections are properly sealed.