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. 184-6308
Mfr. Part No.1069125
BrandSick
TWD3,555.00
Each
units
Barrel Through Beam 0 10 m PNP M12-4 Pin Connector - - 30V M12 LED IP67 30 mA - <500 μs
RS Stock No. 847-9022
Mfr. Part No.QS12VN6CV20Q5
BrandBanner
TWD3,253.00
Each
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Barrel Convergent Maximum of 20 mm NPN 4-Pin Pico Style Pigtail Quick Disconnect - - 30V - LED IP67 <25 mA - 1.5 ms
RS Stock No. 859-3386
Mfr. Part No.MOFR-M12-5
TWD5,935.00
Each
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Barrel Through Beam (Receiver) - NPN/PNP 15m Cable - - 8V - LED IP66, IP67 11 mA - -
RS Stock No. 669-8303
Mfr. Part No.FPDK10P5135/35A
BrandBaumer
TWD4,829.00
Each
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Block Retroreflective 3.5 m PNP 4-Pin M8 Connector - - 30V - LED IP67 100 mA - <0.5 ms
RS Stock No. 410-8029
Mfr. Part No.FHDK 10P 5101S35A
BrandBaumer
TWD5,303.00
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Block Diffuse 20 → 120 mm PNP 4-Pin M8 Connector - - 30V - LED IP67 100 mA - <1 ms
RS Stock No. 184-6317
Mfr. Part No.1084103
BrandSick
TWD5,086.00
Each
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Block Retroreflective 0.07 5 m PNP M8-4 Pin Connector - - 30V M8 LED IP67 30 mA - <625 μs
RS Stock No. 180-6331
Mfr. Part No.WTT12LC-B2533
BrandSick
TWD11,398.00
Each
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Block Background Suppression 50 → 2500 mm NPN/PNP M12 Male Connector - - 30V M12 Male 5-pin Connector Laser Light IP67 100 mA - 0.5 ms
RS Stock No. 458-840
Mfr. Part No.WTB12-3P2411
BrandSick
TWD8,886.00
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- - - PNP - - - - - LED IP66, IP67, IP69 - - <=330 μs
RS Stock No. 458-226
Mfr. Part No.E3ZMV66OMS
BrandOmron
TWD6,745.00
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Block Diffuse 12 mm PNP 4-Pin M8 Connector - - 30V - LED IP69K 100 mA - 50 μs
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Mfr. Part No.Q4XFPLAF110-Q8
BrandBanner
TWD12,604.00
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Block Distance 35 → 110 mm PNP 4-Pin M12 Connector - - 30V M12 Connector LED IP67, IP68, IP69K 100 mA - 1.5 ms
RS Stock No. 125-4519
Mfr. Part No.PM-L25
BrandPanasonic
TWD714.00
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Fork Through Beam (Fork) 6 mm NPN 1m Cable - - 24V Cable Infrared IP64 50 (Sink Current) mA - 20 (Received) μs, 80 (Interrupted) μs
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Mfr. Part No.1069579
BrandSick
TWD2,468.00
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Barrel Diffuse 10 400 mm PNP M12-4 Pin Connector - - 30V M12 LED IP67 30 mA - <1000 μs
RS Stock No. 816-0324
Mfr. Part No.E3FCDN22
BrandOmron
TWD3,090.00
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Barrel Diffuse 300 mm NPN M12 Connector - - 30V Cable LED IP67, IP68, IP69K 25 mA - 0.5 ms
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Mfr. Part No.E3T-SR22
BrandOmron
TWD4,690.00
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Block Retroreflective 10 → 200 mm NPN Pre-Wired Cable - - 26.4V - LED IP67 50 mA - 1 ms
RS Stock No. 121-2721
Mfr. Part No.WTB27-3P2461
BrandSick
TWD7,487.00
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Block Background Suppression 30 2000 mm PNP 4-Pin M12 Connector - - 30V M12 LED IP69K 35 mA - 1.5 ms
RS Stock No. 176-9847
Mfr. Part No.QS18VN6LVQ8
BrandBanner
TWD3,721.00
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Block Through Beam 6500 mm NPN M12 Connector - - 30V Connector LED IP67 - - 0.6 ms
New
RS Stock No. 190-4210
Mfr. Part No.T18-2VPLPC-Q8
BrandBanner
TWD4,388.00
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Barrel Retroreflective 6 m PNP 4 Pin M12 Connector - - 30V 4 Pin M12 Connector Red LED IP67, IP68, IP69K <16 mA - 0.75 (OFF) ms, 1.5 (ON) ms
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Mfr. Part No.E3S-DBP21 OMS
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Block Retroreflective 0 → 4.5 m PNP 4-Pin M12 Connector - - 30V Cable LED IP67, IP69 100 mA - 0.5 ms
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Miniature Through Beam 15 m NPN Cable - - 24 V, 26.4 V Cable LED IP67 13 mA - 1 ms
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BrandOmron
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Block Retroreflective 0.2 → 7 m PNP 3-Wire Cable 2m - - 26.4V - LED IP67 100 mA - 1 ms