Photoelectric Proximity Switches SIMATIC PXO
Fast and Accurate Sensing with Light and Laser
Pure optical acumen – this characterizes our extremely precise, fast and pin-point accurate optical proximity switches. Superior configuration convenience via teach-in or potentiometer and the easiest operational handling are added benefits. With the most varied shapes – from cubical, cylindrical to miniature designs – and models, e.g. reflective light scanners with or without background suppression, reflective light or thru-beam sensors, you can confidently master any task with a transmission range up to 50 m.
Highlights
Extremely accurate and fast
High performance even across large distances
Small, compact housing
Reliable measurement even in the smallest spaces with Mini-Sensor (K20/K21)
Color recognition on the basis of light LED technology (PXO560)
Degree of protection up to IP68
Settable sensing ranges
Simple commissioning (TeachIn)
UL/CSA approvals
ATEX approval for the application in the explosion-hazard area zone 2/22 (PXO240)
Diffuse sensor (energetic sensor)
The light from the emitter falls on an object and is reflected in a diffuse pattern. Part of this reflected light reaches the receiver located in the same device. If the intensity of the received light is sufficient, the output is switched. The sensing range depends on the size and color of the object involved as well as its surface texture. The sensing range can be varied within a wide range by means of the built-in potentiometer. The energetic sensor can therefore also be used to detect different colors.
Diffuse sensor with background suppression
Diffuse sensors with background suppression can detect objects up to a specific sensing range. All objects beyond this range are suppressed. The focus level can be adjusted. The background is suppressed due to the geometric constellation between the emitter and the receiver.
Retro-reflective sensors
The light from the emitter diode is focused through a lens and directed via a polarization filter to a reflector (principle of a 3-way mirror). Part of the reflected light passes through another polarization filter and reaches the receiver. The filters are selected and aligned in such a way that only the light reflected from the reflector reaches the receiver and not the light reflected from other objects within the beam range.
Thru-beam sensors
Thru-beam sensors comprise an emitter and a receiver. The emitter is aligned in such a way that the greatest possible amount of pulsed light from the emitter diode reaches the receiver. The receiver evaluates the incoming light to clearly separate it from the ambient light and other light sources.
2008-04-29 | 