Generic M4 LTD-04NO Laser Micro Photoelectric Switch Visible Laser 50-70mm Detection - M4 Thread

The sensor provides an NPN open-collector output (Normally Open configuration). It has three wires: Brown (V+), Blue (V- / GND), and Black (Output). The Black output wire switches to GND (sinks current) when an object is detected within range. Always connect a pull-up resistor to your positive logic voltage if interfacing directly with a microcontroller input.

The NPN output transistor is rated for a maximum continuous current of 150mA. This is sufficient to directly drive small relays, solenoids, PLC input modules, or indicator LEDs (with a current-limiting resistor). Ensure the load's operating voltage does not exceed the sensor's 30V DC maximum.

Yes, as a diffuse reflection sensor, it detects objects based on the light scattered back from their surface. While highly transparent or mirror-like surfaces may reflect less light and reduce the effective sensing distance, most materials, including glass and polished metal, can be detected within its specified 50-70mm range under normal conditions.

Mount the sensor using its M4 threaded body into a corresponding tapped hole. The visible red laser beam makes alignment straightforward. Point the sensor directly at the target detection area. The optimal detection distance is achieved when the object surface is perpendicular to the laser beam. Fine-tune the distance (between 50mm and 70mm) for the strongest and most reliable signal.