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. 193-8353
Mfr. Part No.E3AS-F1000IMN M3
BrandOmron
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Compact Reflective 50 mm → 1 m NPN M8 Connector - IO-LINK 30V M8 Connector Infrared IP67, IP67G, IP69K 30 mA IO-Link 150 ms
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Mfr. Part No.QMT42VP6DX
BrandBanner
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Block Diffuse 10 mm → 6 m PNP Cable - - 30V - LED IP67 <40 mA - 1 ms
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Mfr. Part No.E3RBDP23
BrandOmron
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Barrel Diffuse 700 mm PNP 4-Pin M12 Connector - - 30V - LED IP67, IP69K 25 mA - 0.5 ms
RS Stock No. 189-2145
Mfr. Part No.XUM2APSBM8R
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Miniature Through Beam 15 m PNP 4 Pin Male Connector M8 - - 24 V, 26.4 V 4 Pin Male Connector M8 LED IP67 13 mA - 1 ms
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Mfr. Part No.XU5M18MA230K
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Block Diffuse 400 mm Solid State 1/2 in-20 UNF Connector 240V - 240V Screw LED IP67 200 mA - <1 ms
RS Stock No. 125-4520
Mfr. Part No.PM-L25-R
BrandPanasonic
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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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Fork Through Beam 80 mm NPN 3-Pin M8 Connector - - 24V - LED IP65, IP67 100 mA - -
New
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Mfr. Part No.PMP12RGM
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Block Retroreflective 12 m NC, NO Cable - - - - - - - - -
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Mfr. Part No.VS8EANAF70Q5
BrandBanner
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- - 5 → 70 mm NPN 4-Pin M12/Eurostyle Cable 200 mm - - 30V Cable Red LED IP67 <20 mA - 500 μs
New
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Mfr. Part No.MPFR-4-25M
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Barrel Through Beam 25 m Relay Screw Terminal - - - - - - - - -
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Mfr. Part No.BOS R020K-PS-RX11-00,2-S49
BrandBALLUFF
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Block Through Beam (Emitter and Receiver) 0 → 2000 mm PNP M8 Connector - - - Connector LED IP67 - - -
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Mfr. Part No.Q5XKLAF2000-Q8
BrandBanner
$763.25
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Rectangular Background/Foreground Suppression 95 → 2000 mm PNP/NPN M12 Connector - IO-LINK 30V M12 Connector LED IP67 50 mA IO-Link 3 ms
RS Stock No. 860-1620
Mfr. Part No.SM312CV2
BrandBanner
$252.99
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Block Convergent 43 mm NPN/PNP Cable - - 30V - LED IP67 25 mA - 1 ms
RS Stock No. 752-5212
Mfr. Part No.XUB1ANANL2
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Barrel Retroreflective 4 m NPN Cable - - 24V - Infrared IP65, IP67 100 mA - <1 ms
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Mfr. Part No.EE-SX771
BrandOmron
$68.78
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- - - NPN - - - - - GaAs Infrared LED IP60 - - -
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Compact Retroreflective 5 m PNP Cable - - 24V - LED IP65 100 mA - <2 ms
RS Stock No. 901-2780
Mfr. Part No.CX-422-P-J
BrandPanasonic
$199.46
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Block Diffuse 800 mm PNP M12 Connector - - 24V - Infrared IP67 - - 1 ms
RS Stock No. 176-9034
Mfr. Part No.O300.GL-11171741
BrandBaumer
$424.02
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Block Diffuse 15 → 250 mm - 4-Pin M8 Connector - - 30V Connector LED IP67 <100 mA - <0.25 ms
RS Stock No. 175-7826
Mfr. Part No.Q4XFPCOD310-Q8
BrandBanner
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Block Distance 35 → 310 mm PNP 4-Pin M12 Connector - - 30V M12 Connector LED IP67, IP68, IP69K 100 mA - 1.5 ms
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BrandOmron
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Block Diffuse 700 mm PNP 3-Wire Cable 2m - - 30V - Infrared IP67 100 mA - 0.5 ms
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