StanBon STD20-52NC Light Curtain Sensor - 52 Beams, 20mm Pitch, 1020mm Height, NPN/PNP Output

The dual NPN (sinking) and PNP (sourcing) output modes provide flexibility to interface with a wide range of PLCs and safety relays. You select the mode that matches your control system's input logic, ensuring a reliable safety signal (beam broken = output active) to trigger an immediate machine stop or alarm.

A 20mm pitch means the infrared beams are spaced 20mm apart vertically. This fine resolution ensures the curtain can detect objects as small as a finger, providing a higher level of personnel protection compared to curtains with larger pitches (e.g., 30mm or 40mm), which are designed for body detection.

Mount the transmitter and receiver units on stable surfaces opposite each other, ensuring they are parallel and within the 0.2m to 2.5m sensing distance. Use the included mounting accessories. During power-up, the units perform a synchronization check; a steady indicator light typically confirms correct alignment and operation.

Yes, the IP54 rating indicates the housing is protected against dust ingress and water splashes from any direction. This makes it suitable for most factory floors but it is not suitable for continuous water exposure, high-pressure washing, or submerged conditions.

The response time ranges from 4ms to 18ms. This is the delay between a beam interruption and the output signal change. A fast response is critical in safety applications to ensure the machine's stopping time, combined with the sensor's reaction time, meets safety standards (like ISO 13855) to prevent injury.