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. 463-8384
Mfr. Part No.RLK39-54/31/40A/116
$360.32
Each
units
Block Retro-Reflective 7 m Relay 4-Terminal Screw 240V - 240V - LED IP67 3 A - <=20 ms
RS Stock No. 768-5920
Mfr. Part No.E3FADN132MOMI
BrandOmron
$112.87
Each
units
Barrel Diffuse 1 m NPN Pre-Wired Cable - - 30V - LED IP67, IP69K 25 mA - 0.5 ms
RS Stock No. 764-3887
Mfr. Part No.S18SP6DQ
BrandBanner
$119.31
Each
units
Barrel Diffuse 0 → 100 mm PNP 4-Pin M12 Connector - - 30V - Infrared IP69K 150 mA - 3 ms
RS Stock No. 510-3249
Mfr. Part No.RLK29-55/59/116-SET
$178.64
Each
units
Block Retroreflective 12 m Relay 6-Terminal Screw 230V - 230V - LED IP67 2 A - 50 ms
RS Stock No. 770-7001
Mfr. Part No.WTB250-2P2441
BrandSick
$379.12
Each
units
Block Background Suppression 150 → 500 mm PNP 4-Pin M12 Connector - - 30V - LED IP67 100 mA - <=3 ms
RS Stock No. 770-7004
Mfr. Part No.WL250-2P1131
BrandSick
$277.21
Each
units
Block Retroreflective 12 → 15 m PNP 4-Wire Cable 2m - - 30V - LED IP67 100 mA - <=0.05 ms
RS Stock No. 778-8716
Mfr. Part No.E3JK-TR11 2M
BrandOmron
$234.49
Each
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Block Through Beam (Emitter and Receiver) 40 m Relay 5-Wire Cable 2m 240V - 240V Wire Lead LED IP64 - - 20 ms
RS Stock No. 122-0713
Mfr. Part No.WL100-2P4439
BrandSick
$131.95
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Block Retroreflective 10 mm → 7.2 m PNP 4-Pin M8 Connector - - 30V M8 Connector LED IP67 >30 mA - >500 μs
RS Stock No. 784-6692
Mfr. Part No.DT50-P1123
BrandSick
$614.07
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Block Background Suppression 200 → 10000 mm Analogue 5-Pin M12 Connector - - 30V - Laser Light IP65 100 mA - 20 ms, 30 ms
RS Stock No. 847-9303
Mfr. Part No.QS18VP6DQ8
BrandBanner
$177.77
Each
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Barrel Diffuse 450 mm PNP 4-Pin M12 Connector - - 30V - LED IP67 <25 mA - 600 μs
RS Stock No. 512-4640
Mfr. Part No.XUK1ARCNL2
$256.24
Each
units
Compact Retro-Reflective 7 m Relay Cable 240V - 240V - Infrared IP65 3 A - <25 ms
RS Stock No. 786-5918
Mfr. Part No.WL12L-2B530
BrandSick
$781.55
Each
units
Block Retroreflective 0 → 18 m NPN/PNP 5-Pin M12 Connector - - 30V - Laser Light IP67, IP69K 100 mA - 200 μs
RS Stock No. 372-8177
Mfr. Part No.E3ZR612M
BrandOmron
$172.48
Each
units
Block Retroreflective 100 mm → 4 m NPN 3-Wire Cable 2m - - 26.4V - LED IP69K 100 mA - 1 ms
RS Stock No. 768-5879
Mfr. Part No.E3FA-RN21
BrandOmron
$110.29
Each
units
Barrel Retroreflective 0.1 → 4 m NPN 4-Pin M12 Connector - - 30V - LED IP67, IP69K 25 mA - 0.5 ms
RS Stock No. 878-7948
Mfr. Part No.XUK1ARCNL2H60
$273.00
Each
units
Compact Retroreflective 10 m Relay 5-Wire Cable 2m 240V - 240V Cable LED IP65 3 A - -
RS Stock No. 812-8257
Mfr. Part No.FD-42G
BrandPanasonic
$150.89
Each
units
Barrel Diffuse 200 mm - Cable - - - Wire Lead - IP40 - - -
RS Stock No. 847-9366
Mfr. Part No.QS18VP6LLPQ8
BrandBanner
$309.17
Each
units
Barrel Retroreflective 100 mm → 10 m PNP 4-Pin M12 Connector - - 30V - Laser Light IP67 <15 mA - 700 μs
RS Stock No. 219-2296
Mfr. Part No.EE-SX672
BrandOmron
$48.15
Each
units
Fork Through Beam (Fork) 5 mm NPN Connector - - 24V - Infrared IP50 100 mA - -
RS Stock No. 821-0056
Mfr. Part No.E3Z-T61-D 2M
BrandOmron
$190.99
Each
units
Block Through Beam (Receiver) 15 m NPN 2/3-Wire Cable 2m - - 24V Wire Lead Infrared IP67 20 mA - 1 ms
RS Stock No. 219-2274
Mfr. Part No.EE-SX670
BrandOmron
$50.56
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Fork Through Beam (Fork) 5 mm NPN Connector - - 24V - Infrared IP50 100 mA - -
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