Plastic or metal housing, with cylindrical, square, fork, glass or plastic optical fiber Direct detection system Long distance, up to 100m, detection of opaque objects Accurate, reliable, anti-harsh conditions (dust, scattering light guide) Reflection system detection range Medium , Maximum 15m, easy to install, detection of opaque objects or non-reflective transparent objects; polar reflection system can detect reflective objects diffuse system detection distance is short, the maximum 2m, depending on the object reflection coefficient, installation and set up simple photoelectric correction system Transparent, reflective or translucent objects can be detected, requiring a clean environment. Diffuse systems with background suppression are not sensitive to background objects. The detection distance is independent of the color of the object. Relays or solid-state outputs are also available. -20mA) Outputs Selectable functions: time delay, separation amplifier, sensitivity adjustment and other three wiring methods: screw terminals, connectors, cable leads, the highest protection level IP67Design18 the most widely used standard on the market, The first generation of Ø18 and has background suppression.