Photoelectric Sensors

Photoelectric sensors detect and measure physical objects or quantities by emitting a field or beam of electromagnetic radiation, an object is detected by measuring alterations in the return signal. There are 3 main types of photoelectric sensors which provide reliable detection, these are through-beam, retro-reflective and diffuse. The basic function of each is to detect the presence or absence of objects or measure the distance to the object.


Through-beam Sensors


Through-beam sensors (aka thru-beam) rely on two separate housings, one for the transmitter and one for the receiver, with the transmitter providing a continuous beam of light to the receiver. Each time an object passes through the beam this interrupts the signal between the transmitter and receiver, which in turn causes the receiver to send an electrical signal to the output. Through-beam sensors are suited to long-distance sensing and are capable of detecting almost any object, irrespective of colour or angular motion.


Retro-reflective Sensors


Retro-reflective photoelectric sensors (retroreflective) have both the transmitter and receiver contained within the same housing but require a reflector opposite to the sensor. The reflector bounces the light beam back to the transmitter until an object breaks the beam. Objects which are highly reflective such as aluminium require sensors with polarising filters. The filter allows the sensor to acknowledge that the reflected light from reflecting materials is different from the reflector.


Diffuse Sensors


Diffuse sensors (proximity sensor) are easier to install as only one device has to be mounted. This is because the transmitter and receiver are contained within one housing. Diffuse sensors use the reflection from the target object within a predetermined sensing range. The transmitter sends out a continuous beam of light, once this hits the target it is diffused in all directions, a part of this light is reflected back and recognised by the receiver, the receiver then sends an electrical signal to the output.


A special type of diffused mode is background suppression which enables the user to precisely control the sensing range. A diffuse mode sensor with background suppression is less sensitive to the target colour. They can also use a visible red light or infrared light sources.


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Description Prix Sensor Style Detection Type Detection Range Output Type Electrical Connection Maximum AC Voltage Maximum DC Voltage Optical Technology Terminal Type Light Source IP Rating Maximum Current Interface Response Time
N° de stock RS 845-3468
Référence fabricantXUBLANCNM12R
166,55 €
Each
Unité
Barrel Through Beam (Receiver) 0 30 m NPN - - 30V - - Laser Light IP67 25 mA - <0.4 ms
N° de stock RS 845-3465
Référence fabricantXUBLBKCNL2T
171,60 €
Each
Unité
Barrel Through Beam (Emitter) 0 30 m - - - 30V - - Laser Light IP67 25 mA - <0.4 ms
N° de stock RS 845-3499
Référence fabricantXUY92CGAMP230
294,27 €
Each
Unité
- Through Beam - Relay - 264.5V - - - - IP20 - - 33 ms
N° de stock RS 845-3474
Référence fabricantXUBLBKCNM12T
173,82 €
Each
Unité
Barrel Through Beam (Emitter) 0 30 m - - - 30V - - Laser Light IP67 25 mA - <0.4 ms
N° de stock RS 845-3487
Référence fabricantXUY92CG41R250
98,71 €
Each
Unité
- Through Beam (Receiver) - - Cable - - - - - IP67 - - -
N° de stock RS 845-3455
Référence fabricantXUBLAKCNL2T
166,55 €
Each
Unité
Barrel Through Beam (Emitter) 0 30 m - - - 30V - - Laser Light IP67 25 mA - <0.4 ms
N° de stock RS 845-3483
Référence fabricantXUY92CG41E520
113,49 €
Each
Unité
- Through Beam (Emitter) - - Cable - - - - Infrared IP67 - - -
N° de stock RS 845-3496
Référence fabricantXUY92CG41R520
98,71 €
Each
Unité
- Through Beam (Receiver) - - Cable - - - - - IP67 - - -
N° de stock RS 845-3477
Référence fabricantXUBLBNCNM12R
171,60 €
Each
Unité
Barrel Through Beam (Receiver) 0 30 m NPN - - 30V - - Laser Light IP67 25 mA - <0.4 ms
N° de stock RS 845-3493
Référence fabricantXUY92CGAMP24
294,27 €
Each
Unité
- Through Beam - NPN - - 24V - - - IP20 - - 33 ms