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 Communication Protocol Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface Response Time
RS Stock No. 729-5141
BrandRS PRO
£67.47
Each
Units
Block Diffuse 40 → 1000 mm PNP Cable - - 30V - LED IP67 100 mA - <=2.5 ms
RS Stock No. 729-5126
BrandRS PRO
£73.89
Each
Units
Barrel Through Beam (Emitter) 28 m NPN 4-Pin M12 Connector - - 30V - LED IP67 100 mA - <=0.5 ms
RS Stock No. 729-5167
BrandRS PRO
£104.94
Each
Units
Block Through Beam (Emitter) 20 m PNP 4-Pin M12 Connector - - 30V - LED IP67 100 mA - 2.5 ms
RS Stock No. 729-5176
BrandRS PRO
£105.80
Each
Units
Block Through Beam (Emitter) 20 m PNP Cable - - 30V - LED IP67 100 mA - 2.5 ms
RS Stock No. 444-3619
Mfr. Part No.XUX0ARCTT16
£151.00
Each
Units
Block Multimode 1.3 m, 2 m, 11 m, 40 m Relay 5-Terminal Screw 240V - 240V - Infrared IP65, IP67 3 A, 500 mA - <25 ms
RS Stock No. 289-2491
Mfr. Part No.WL150-P430
BrandSick
£105.66
Each
Units
Block Retroreflective 2.4 m PNP 4-Pin M8 Connector - - 30V - LED IP67 100 mA - <=0.5 ms
RS Stock No. 374-2044
Mfr. Part No.E3ZR86
BrandOmron
£79.35
Each
Units
Block Retroreflective 100 mm → 4 m PNP 4-Pin M8 Connector - - 26.4V - LED IP69K 100 mA - 1 ms
RS Stock No. 444-3451
Mfr. Part No.XUB0BPSNM12
£86.00
Each
Units
Barrel Multimode 120 mm → 15 m PNP 4-Pin M12 Connector - - 24V - Infrared IP65, IP67 100 mA - <2 ms
RS Stock No. 288-9805
Mfr. Part No.WT150-P460
BrandSick
£129.87
Each
Units
Block Diffuse 2 → 100 mm PNP 4-Pin M8 Connector - - 30V - LED IP67 100 mA - <=0.5 ms
RS Stock No. 358-7926
Mfr. Part No.WL260-R270
BrandSick
£142.36
Each
Units
Block Retroreflective 100 mm → 15 m Relay 5-Terminal Screw 240V - 30V - LED IP67 3 A - <=20 ms
RS Stock No. 122-0713
Mfr. Part No.WL100-2P4439
BrandSick
£70.42
Each
Units
Block Retroreflective 10 mm → 7.2 m PNP 4-Pin M8 Connector - - 30V M8 Connector LED IP67 >30 mA - >500 μs
RS Stock No. 739-6673
Mfr. Part No.O1D100
£299.15
Each
Units
Block Diffuse 0.2 → 10 m PNP M12 Connector - - 30V - Laser Light IP67 200 mA - -
RS Stock No. 256-433
Mfr. Part No.E3JMR4M4G
BrandOmron
£112.70
Each
Units
Block Retroreflective 4 m Relay 5-Terminal Screw 250V - 5V - LED IP66 3 A - 30 ms
RS Stock No. 512-4640
Mfr. Part No.XUK1ARCNL2
£86.45
Each
Units
Compact Retroreflective 7 m Relay 5-Wire Cable 2m 240V - 240V - Infrared IP65 3 A - <25 ms
RS Stock No. 444-3530
Mfr. Part No.XUK0AKSAM12
£106.00
Each
Units
Compact Through Beam (Emitter) 280 mm → 30 m NPN/PNP 4-Pin M12 Connector - - 24V - Infrared IP65 100 mA - <2 ms
RS Stock No. 617-0694
Mfr. Part No.E3Z-LL86
BrandOmron
£126.10
Each
Units
Block Background Suppression 20 → 300 mm PNP 4-Pin M8 Connector - - 26.4V - LED IP67 100 mA - 1 ms
RS Stock No. 493-7287
Mfr. Part No.WL18-3P430
BrandSick
£167.15
Each
Units
Block Retroreflective 7 m PNP 4-Pin M12 Connector - - 30V - LED IP65, IP67 100 mA - 500 μs
RS Stock No. 458-828
Mfr. Part No.WL12-3P2431
BrandSick
£147.73
Each
Units
Block Retroreflective 7 m PNP 4-Pin M12 Connector - - 30V - LED IP69K 100 mA - <=330 μs
RS Stock No. 360-0451
Mfr. Part No.WT24-2R210
BrandSick
£283.31
Each
Units
- - - Relay - - - - - LED IP69 - - <=10 ms
RS Stock No. 770-7008
Mfr. Part No.WL250-2R1531
BrandSick
£127.16
Each
Units
Block Retroreflective 100 mm → 15 m Relay 5-Wire Cable 2m 240V - 240V - LED IP67 - - <=15 ms
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