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 Price Sensor Style Detection Type Detection Range Output Type Electrical Connection Maximum AC Voltage Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface Response Time Housing Material
RS Stock No. 768-9461
Mfr. Part No.WL9-3P2430
BrandSick
£102.85
Each
Units
Block Retroreflective 0 → 4 m PNP 4-Pin M12 Connector - 30V - LED IP66, IP67, IP69K 100 mA - <0.5 ms Al2O3
RS Stock No. 157-7062
Mfr. Part No.E3JMR4M4TG
BrandOmron
£128.30
Each
Units
Block Retroreflective 4 m Relay 5-Terminal Screw 250V 5V - LED IP66 3 A - 30 ms ABS
RS Stock No. 768-5881
Mfr. Part No.E3FARP21
BrandOmron
£51.50
Each
Units
Barrel Retroreflective 0.1 → 4 m PNP 4-Pin M12 Connector - 30V - LED IP67, IP69K 25 mA - 0.5 ms ABS
RS Stock No. 218-989
Mfr. Part No.WT100L-F2241
BrandSick
£127.88
Each
Units
Block Diffuse 450 mm PNP 4-Pin M8 Connector - 30V - Laser Light IP65 100 mA - <0.25 ms ABS, PMMA
RS Stock No. 743-1313
Mfr. Part No.E3Z-LS86
BrandOmron
£101.20
Each
Units
Block Background Suppression 20 → 200 mm PNP 4-Pin M8 Connector - 26.4V - LED IP67 100 mA - 1 ms PBT
RS Stock No. 891-9514
Mfr. Part No.RLK31-8-2500-IR/31/115
£57.60
Each
Units
Block Diffuse 0 → 2500 mm Relay 5-Wire Cable 2m 240V 240V - Infrared IP67 40 mA - 25 ms PC
RS Stock No. 510-3249
Mfr. Part No.RLK29-55/59/116-SET
£95.90
Each
Units
Block Retroreflective 12 m Relay 6-Terminal Screw 230V 230V - LED IP67 2 A - 50 ms ABS
RS Stock No. 444-3489
Mfr. Part No.XUM0APSAL2
£94.00
Each
Units
Block Multimode 0.1 m, 0.4 m, 3 m, 10 m PNP 3-Wire Cable 2m - 24V - Infrared IP65, IP67 100 mA - <2 ms PBT
RS Stock No. 371-4651
Mfr. Part No.VL18-3P3840
BrandSick
£78.54
Each
Units
Barrel Retroreflective 0.005 → 3.7 m PNP 4-Pin M12 Connector - 30V - LED IP67 100 mA - <=2 ms PBT, PC
RS Stock No. 512-4656
Mfr. Part No.XUK9ARCNL2
£92.00
Each
Units
Compact Retroreflective 5 m Relay 5-Wire Cable 2m 240V 240V - LED IP65 3 A - <25 ms PBT
RS Stock No. 218-973
Mfr. Part No.WL100L-F2231
BrandSick
£127.88
Each
Units
Block Retroreflective 0.08 → 12 m PNP 4-Pin M8 Connector - 30V - Laser Light IP65 100 mA - <0.25 ms ABS, PMMA
RS Stock No. 701-8803
Mfr. Part No.WLG4S-3P2232V
BrandSick
£163.80
Each
Units
Block Retroreflective 5 m PNP 4-Pin M8 Connector - 30V - LED IP69K 100 mA - <=0.5 ms Stainless Steel
RS Stock No. 786-5918
Mfr. Part No.WL12L-2B530
BrandSick
£407.66
Each
Units
Block Retroreflective 0 → 18 m NPN/PNP 5-Pin M12 Connector - 30V - Laser Light IP67, IP69K 100 mA - 200 μs Die Cast Zinc
RS Stock No. 786-5911
Mfr. Part No.WL150-P420
BrandSick
£112.22
Each
Units
Block Retroreflective 0.01 → 0.7 m PNP 4-Pin M8 Connector - 30V - LED IP67 100 mA - 0.5 ms ABS
RS Stock No. 786-5924
Mfr. Part No.WS/WE260-S270
BrandSick
£160.82
Each
Units
Block Through Beam (Emitter and Receiver) 0 → 45 m Relay 5-Terminal Screw - 240V - LED IP67 3 A - 20 ms ABS, Plastic
RS Stock No. 444-3568
Mfr. Part No.XUX0AKSAM12
£131.00
Each
Units
Block Multimode 1.3 m, 2 m, 11 m, 40 m NPN/PNP 4-Pin M12 Connector - 24V - Infrared IP65, IP67 100 mA - <2 ms PBT
RS Stock No. 814-0349
Mfr. Part No.OGP500
£107.52
Each
Units
Barrel Retroreflective 0.03 → 5 m PNP M12 Connector - 36V 4-Pin LED IP67 20 mA - - Stainless Steel
RS Stock No. 444-3394
Mfr. Part No.XUB0APSNL2
£80.00
Each
Units
Barrel Multimode 0.12 m, 0.3 m, 2 m, 15 m PNP 3-Wire Cable 2m - 24V - Infrared IP65, IP67 100 mA - <2 ms PBT
RS Stock No. 444-3625
Mfr. Part No.XUX0ARCTT16T
£78.00
Each
Units
Block Through Beam (Emitter) 40 m - 3-Terminal Screw 240V 240V - Infrared IP65, IP67 3 A, 500 mA - <25 ms PBT
RS Stock No. 194-4018
Mfr. Part No.OPB608A
BrandOptek
£1.23
Each
Units
Block Retroreflective 1.27 → 9.525 mm NPN - - - Wire Lead Infrared - - - - Plastic
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