Photoelectric Switch Sensor, 0-40cm, NPN/PNP, NO/NC

Photoelectric switch sensors primarily include three types: through-beam, diffuse reflection, and mirror reflection. Through-beam sensors consist of an emitter and receiver, offering long detection distances and strong anti-interference capabilities. Diffuse reflection sensors detect objects via reflected light, featuring easy installation. Mirror reflection sensors operate using a reflective plate, balancing moderate detection distances with stability.

This SUCH photoelectric switch sensor is a diffuse reflection type. Note that object material and surface reflectivity affect detection distance. Ensure correct power polarity during wiring to prevent short circuits. Keep cables away from interference sources like motors and relays. Maintain probe area cleanliness to avoid dust or oil obstructing light and reducing detection sensitivity.

Common faults include false triggering, failure to trigger, or unstable output. For false triggering, check for external strong light interference or highly reflective objects nearby. Failure to trigger may result from misaligned optical axis, obstructions, or wiring errors. Unstable output could stem from dirty lenses, excessively high sensitivity settings, or equipment vibration. Recommendations include cleaning the optical window, recalibrating the brightness threshold, and verifying secure power and load connections. In complex environments, install a light shield or opt for a more interference-resistant through-beam sensor.