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
New
RS Stock No. 205-5105
Mfr. Part No.WL280-2H1531
BrandSick
SGD155.20
Each
units
Rectangular Retro Reflective 15 m Relay Contact Cable 240V - 240V 5-pin LED IP66, IP67 - - 15 ms
RS Stock No. 125-4529
Mfr. Part No.PM-F25-C3
BrandPanasonic
SGD41.32
Each
units
Fork Through Beam (Fork) 6 mm NPN 3m Cable - - 24V Cable Infrared IP64 50 mA - 20 μs, 80 μs
RS Stock No. 753-0337
Mfr. Part No.XUK2ARCNL2R
SGD118.34
Each
units
Compact Through Beam (Receiver) 30 m Relay 5-Wire Cable 2m 240V - 240V - Infrared IP65 3 A - <25 ms
New
RS Stock No. 205-5258
Mfr. Part No.WLA16P-34162100A00Z
BrandSick
SGD224.00
Each
units
Rectangular Retro Reflective 10 m NPN, PNP, PUSH/PULL Cable With M12 Male Connector - - 30V 4-pin LED IP66, IP67, IP69 - IO-Link 500 μs
RS Stock No. 510-3261
Mfr. Part No.RL29-8-2000/73C/136
SGD174.00
Each
units
Block Diffuse 20 → 2000 mm Push Pull 4-Pin M12 Connector - - 30V - LED IP65 100 mA - 4 ms
RS Stock No. 820-9980
Mfr. Part No.E3S-AD13
BrandOmron
SGD255.70
Each
units
Block Diffuse 100 mm NPN Pre-Wired Cable - - 30V Wire Lead Infrared IP67 35 mA - 500 μs
New
RS Stock No. 205-4985
Mfr. Part No.GL10-P7551
BrandSick
SGD139.68
Each
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Rectangular Retro Reflective 10 m PNP Cable with connector - - 30V 4-pin PinPoint LED IP67 - - 1 ms
RS Stock No. 218-951
Mfr. Part No.WL100L-F1131
BrandSick
SGD220.80
Each
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Block Retroreflective 0.08 → 12 m PNP Cable - - 30V - Laser Light IP65 100 mA - <0.25 ms
RS Stock No. 289-0136
Mfr. Part No.VL18-2T2460
BrandSick
SGD176.00
Each
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Barrel Retroreflective 0.005 → 3.5 m Triac 4-Pin M12 Connector 253V - - - LED IP67 300 mA - <=20 ms
RS Stock No. 752-5124
Mfr. Part No.XUB9APANL2
SGD97.89
Each
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Barrel Retroreflective 2 m PNP Cable - - 24V - LED IP65, IP67 100 mA - <1 ms
RS Stock No. 786-5911
Mfr. Part No.WL150-P420
BrandSick
SGD196.80
Each
units
Block Retroreflective 0.01 → 0.7 m PNP 4-Pin M8 Connector - - 30V - LED IP67 100 mA - 0.5 ms
New
RS Stock No. 205-4981
Mfr. Part No.GL10-P4211
BrandSick
SGD143.64
Each
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Rectangular Retro Reflective 12 m PNP Connector M12 - - 30V 4-pin PinPoint LED IP67 - - 500 μs
RS Stock No. 860-1519
Mfr. Part No.SM2A312D
BrandBanner
SGD223.92
Each
units
Block Diffuse 380 mm Relay Cable 240V - - - LED IP67 - - 1 ms
RS Stock No. 136-5400
Mfr. Part No.OPU203
SGD385.05
Each
units
Fork Through Beam (Fork) >0.5 mm PNP 3-Pin M8 Connector - - 35V Quick Disconnect LED IP67 30 mA - -
RS Stock No. 134-7788
Mfr. Part No.WLG4C-3P2232A00
BrandSick
SGD195.20
Each
units
Block Retroreflective 10 mm → 4.5 m PNP 4-Pin M8 Connector - IO-LINK 30V 4-Pin Connector LED IP66, IP67 20 mA IO-Link <500 μs
New
RS Stock No. 205-5209
Mfr. Part No.WL9-3N2230
BrandSick
SGD176.00
Each
units
Rectangular Retro Reflective 4 m NPN Connector M8 - - 30V 4-pin LED IP66, IP67, IP69K - - 500 μs
New
RS Stock No. 205-4937
Mfr. Part No.WL2S-2P1330
BrandSick
SGD158.40
Each
units
Rectangular Retro Reflective 1.2 m PNP Cable - - 30V 3-pin PinPoint LED IP67 - - 500 μs
RS Stock No. 617-0745
Mfr. Part No.E3ZM-LS82H 2M
BrandOmron
SGD271.73
Each
units
Block Retroreflective 10 → 150 mm PNP Pre-Wired Cable - - 30V - LED IP69K 100 mA - 1 ms
New
RS Stock No. 205-4887
Mfr. Part No.GL6-P4112
BrandSick
SGD129.47
Each
units
Rectangular Retro Reflective 6 m PNP Connector M8 - - 30V 4-pin PinPoint LED IP67 - - 650 μs
New
RS Stock No. 205-4983
Mfr. Part No.GL10-R3711
BrandSick
SGD209.80
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Rectangular Retro Reflective 12 m Relay Contact Cable 240V - 240V 5-pin PinPoint LED IP67 - - 10 ms
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