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. 134-7832
Mfr. Part No.WFL50-40B41CA71
BrandSick
TWD15,200.00
Each
units
Fork Through Beam (Fork) >50 mm Push Pull 4-Pin M8 Connector - IO-LINK 30V 4-Pin Connector LED IP65 40 mA IO-Link 60 μs
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Mfr. Part No.GLV18-55-S/73/120
TWD2,203.00
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Barrel Retroreflective 3.5 m PNP 4-Pin M12 Connector - - 30V - LED IP67 100 mA - <=1 ms
RS Stock No. 463-8817
Mfr. Part No.VT12T-2P112
BrandSick
TWD3,086.00
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Barrel Diffuse 115 mm PNP 4-Wire Cable 2m - - 30V - Infrared IP67 100 mA - <=1.25 ms
RS Stock No. 667-0557
Mfr. Part No.FHDK 14P5101/S14
BrandBaumer
TWD5,846.00
Each
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Block Diffuse 20 → 350 mm PNP 4-Pin M12 Connector - - 30V - LED IP67 100 mA - <1 ms
RS Stock No. 701-8809
Mfr. Part No.WSE4S-3E1330V
BrandSick
TWD7,652.00
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Block Through Beam (Emitter and Receiver) 5 m NPN Cable - - 30V - LED IP69K 100 mA - <=2.5 ms
RS Stock No. 842-8535
Mfr. Part No.GTE10-P4212
BrandSick
TWD3,068.00
Each
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Block Diffuse 20 mm → 1.3 m PNP M12 Connector - - 30V M12 LED IP67 20 mA - <500 μs
RS Stock No. 134-7837
Mfr. Part No.WF50-60B41CA71
BrandSick
TWD11,300.00
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Fork Through Beam (Fork) >0.2 mm Push Pull 4-Pin M8 Connector - IO-LINK 30V 4-Pin Connector Infrared IP65 20 mA IO-Link 46 μs
RS Stock No. 431-1994
Mfr. Part No.EX24BPN
BrandPanasonic
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Block Retroreflective 2 → 25 mm PNP Cable - - 24V - LED IP67 50 mA - <=0.5 ms
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BrandBaumer
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Barrel Diffuse 0 → 800 mm PNP 4-Pin M12 Connector - - 30V Threaded Infrared IP67, IP69K 40 mA - <1 ms
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Mfr. Part No.E3FARP22
BrandOmron
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Barrel Retroreflective 0 → 500 mm PNP 4-Pin M12 Connector - - 30V - LED IP67, IP69K 25 mA - 0.5 ms
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Mfr. Part No.PM-F25-C3
BrandPanasonic
TWD927.00
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Fork Through Beam (Fork) 6 mm NPN 3m Cable - - 24V Cable Infrared IP64 50 mA - 20 μs, 80 μs
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Mfr. Part No.XUK2AKSNM12T
TWD1,559.00
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Compact Through Beam (Emitter) 30 m Solid State 4-Pin M12 Connector - - 24V - Infrared IP65 100 mA - <=2 ms
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Mfr. Part No.FHDK 14P5104/S14
BrandBaumer
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Block Diffuse 30 → 500 mm PNP 4-Pin M12 Connector - - 30V - LED IP67 100 mA - <5 ms
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Mfr. Part No.GLV18-8-400-S/25/102/115
TWD2,252.00
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Barrel Diffuse 400 mm NPN Cable - - 30V - LED IP67 100 mA - <=1 ms
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Mfr. Part No.WSE12C-3P2430A00
BrandSick
TWD10,500.00
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Block Through Beam (Emitter and Receiver) 0 → 20 m PNP 4-Pin M12 Connector - IO-LINK 30V 4-Pin Connector LED IP66, IP67, IP69K 30 mA IO-Link 300 μs
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Mfr. Part No.GTE10--R3812
BrandSick
TWD5,027.00
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Block Diffuse 20 mm → 1.3 m Relay Cable 240V - 240V - LED IP67 - - =10 ms
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Mfr. Part No.E3S-DBP21 OMS
BrandOmron
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New
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Block Diffuse 200 mm PNP 4-Pin Connector - - 30V - LED IP67, IP69K 35 mA - 3 ms