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. 458-840
Mfr. Part No.WTB12-3P2411
BrandSick
£207.57
Each
Units
- - - PNP - - - - - LED IP66, IP67, IP69 - - <=330 μs
RS Stock No. 420-473
Mfr. Part No.E3SAR86
BrandOmron
£165.20
Each
Units
Block Retroreflective 100 mm → 2 m PNP M12 Connector - - 30V - LED IP67 100 mA - 0.5 ms
RS Stock No. 510-3255
Mfr. Part No.RLK29-55/25/116-SET
£96.50
Each
Units
Block Retroreflective 12 m Relay 6-Terminal Screw 230V - 230V - LED IP67 2 A - 50 ms
RS Stock No. 458-844
Mfr. Part No.WL12G-3B2531
BrandSick
£201.03
Each
Units
Block Retroreflective 4 m NPN/PNP 5-Pin M12 Connector - - 30V - LED IP69K 100 mA - <=330 μs
RS Stock No. 444-3401
Mfr. Part No.XUB0APSNM12
£81.00
Each
Units
Barrel Multimode 120 mm → 15 m PNP 4-Pin M12 Connector - - 24V - Infrared IP65, IP67 100 mA - <2 ms
RS Stock No. 814-0370
Mfr. Part No.O5D100
£158.45
Each
Units
Block Distance 30 mm → 2 m PNP M12 Connector - IO-LINK 30V Cable LED IP65, IP67 <75 mA IO-Link -
RS Stock No. 493-7259
Mfr. Part No.WT18-3P430
BrandSick
£245.35
Each
Units
Block Diffuse 50 → 600 mm PNP 4-Pin M12 Connector - - 30V - LED IP67 100 mA - <700 μs
RS Stock No. 256-449
Mfr. Part No.E3JMDS70M4G
BrandOmron
£106.30
Each
Units
Block Diffuse 700 mm Relay 5-Terminal Screw 250V - 5V - Infrared IP66 3 A - 30 ms
RS Stock No. 219-027
Mfr. Part No.DT20-P244B
BrandSick
£657.31
Each
Units
Block Background Suppression 100 → 300 mm Analogue 5-Pin M12 Connector - - 30V - Laser Light IP65 100 mA - 2.8 ms
RS Stock No. 450-2954
Mfr. Part No.OBT200-18GM60-E5-V1
£77.80
Each
Units
Barrel Diffuse 200 mm PNP 4-Pin M12 Connector - - 30V - Infrared IP67 100 mA - <=1 ms
RS Stock No. 814-0345
Mfr. Part No.OGH500
£115.29
Each
Units
Barrel Diffuse 15 → 300 mm PNP M12 Connector - - 36V Wire Lead LED IP67 25 mA - -
RS Stock No. 617-0666
Mfr. Part No.E3ZLR86
BrandOmron
£98.95
Each
Units
Block Retroreflective 0.2 → 7 m PNP 4-Pin M8 Connector - - 26.4V - LED IP67 100 mA - 1 ms
RS Stock No. 530-0939
Mfr. Part No.WTB4-3P2161
BrandSick
£130.90
Each
Units
Block Diffuse 4 → 150 mm PNP 3-Pin M8 Connector - - 30V - LED IP66, IP67 100 mA - <0.5 ms
RS Stock No. 778-8700
Mfr. Part No.E3JK-DR12 2M
BrandOmron
£79.05
Each
Units
Block Diffuse 300 mm Relay 5-Wire Cable 2m 240V - 240V Wire Lead LED IP64 - - 20 ms
RS Stock No. 185-2234
Mfr. Part No.FHDM 12P5001
BrandBaumer
£209.00
Each
Units
Block Diffuse 15 → 300 mm PNP 4-Wire Cable 2m - - 30V - LED IP67 100 mA - <1 ms
RS Stock No. 288-9776
Mfr. Part No.WT150-P430
BrandSick
£105.66
Each
Units
Block Diffuse 10 → 250 mm PNP 4-Pin M8 Connector - - 30V - LED IP67 100 mA - <=0.5 ms
RS Stock No. 307-913
Mfr. Part No.OPB704
BrandOptek
£2.04
Each
Units
Block Retroreflective 3.8 mm NPN - - - - Wire Lead Infrared - - - -
RS Stock No. 714-1612
Mfr. Part No.42JS-E2EZB1-F4
£26.70
Each
Units
Block Through Beam (Emitter) 10 m - 4-Pin Connector - - 30V - LED IP67 - - 1 ms
RS Stock No. 768-5888
Mfr. Part No.E3FARP112M
BrandOmron
£51.50
Each
Units
Barrel Retroreflective 100 mm → 4 m PNP 4-Wire Cable 2m - - 30V - LED IP67, IP69K 25 mA - 0.5 ms
RS Stock No. 763-7882
Mfr. Part No.WTB12-3P2431
BrandSick
£207.57
Each
Units
Block Background Suppression 20 → 350 mm PNP 4-Pin M12 Connector - - 30V - LED IP66, IP67, IP69K 100 mA - <=300 μs
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