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. 714-1656
Mfr. Part No.ML100-8-H-350-RT/103/115
$178.00
Each
units
Block Diffuse 5 → 350 mm PNP 3-Wire Cable 2m - - 30V - LED IP67 100 mA - 1 ms
RS Stock No. 768-5863
Mfr. Part No.E3FATP112M
BrandOmron
$161.72
Each
units
Barrel Through Beam (Emitter and Receiver) 20 m PNP 4-Wire Cable 2m - - 30V - LED IP67, IP69K 40 mA - 0.5 ms
RS Stock No. 859-2995
Mfr. Part No.PE12CNT15PO
$161.00
Each
units
Barrel Through Beam (Receiver) 15 m PNP Cable - - 30V - LED IP67 >16 mA - 3.5 ms
RS Stock No. 786-5924
Mfr. Part No.WS/WE260-S270
BrandSick
$258.82
Each
units
Block Through Beam (Emitter and Receiver) 0 → 45 m Relay 5-Terminal Screw - - 240V - LED IP67 3 A - 20 ms
RS Stock No. 455-4983
Mfr. Part No.XUK0ARCTL2
$226.23
Each
units
Compact Diffuse, Retro-Reflective, Through Beam (Receiver) 0.28 m, 0.8 m, 4 m, 30 m Relay Cable 240V - 240V - Infrared IP65 3 A - <25 ms
RS Stock No. 741-7616
Mfr. Part No.VTE18-4N4240V
BrandSick
$160.00
Each
units
Barrel Diffuse 450 mm NPN 4-Pin M12 Connector - - 30V - Infrared IP67, IP68, IP69K 100 mA - <=1 ms
RS Stock No. 444-3619
Mfr. Part No.XUX0ARCTT16
$277.91
Each
units
Block Diffuse, Retro-Reflective, Through Beam (Receiver) 1.3 m, 2 m, 11 m, 40 m Relay Screw Clamp 240V - 240V - Infrared IP65, IP67 3 A, 500 mA - <25 ms
RS Stock No. 768-5888
Mfr. Part No.E3FARP112M
BrandOmron
$129.66
Each
units
Barrel Retroreflective 0.1 → 4 m PNP 4-Wire Cable 2m - - 30V - LED IP67, IP69K 25 mA - 0.5 ms
RS Stock No. 786-5860
Mfr. Part No.WL260-F470
BrandSick
$213.15
Each
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Block Retroreflective 0.01 → 14 m PNP 4-Pin M12 Connector - - 30V - LED IP67 100 mA - 1.5 ms
RS Stock No. 256-449
Mfr. Part No.E3JMDS70M4G
BrandOmron
$273.44
Each
units
Block Diffuse 700 mm Relay 5-Terminal Screw 250V - 5V - Infrared IP66 3 A - 30 ms
RS Stock No. 405-7375
Mfr. Part No.QS18VP6LP
BrandBanner
$179.20
Each
units
Block Retroreflective 3.5 m PNP 4-Wire Cable 2m - - 30V - LED IP67 100 mA - 600 μs
RS Stock No. 786-5851
Mfr. Part No.WL260-S270
BrandSick
$213.15
Each
units
Block Retroreflective 0.01 → 15 m Relay 5-Terminal Screw 240V - 240V - LED IP67 3 A - 20 ms
RS Stock No. 512-4662
Mfr. Part No.XUK5ARCNL2
$198.43
Each
units
Compact Diffuse 1 m Relay 5-Wire Cable 2m 240V - 240V - Infrared IP65 3 A - <25 ms
RS Stock No. 857-7854
Mfr. Part No.PA18CAD10PASA
$116.41
Each
units
Barrel Diffuse 1 m PNP 4-Wire Cable 2m - - 30V - LED IP66, IP69K <20 mA - >1 ms
RS Stock No. 847-9555
Mfr. Part No.QS30LLPQ
BrandBanner
$367.85
Each
units
Block Retroreflective 0.2 → 18 m NPN/PNP 5-Pin M12 Connector - - 30V - Laser Light IP67 35 mA - 500 μs
RS Stock No. 374-2016
Mfr. Part No.E3ZT812M
BrandOmron
$275.80
Each
units
Block Through Beam (Emitter and Receiver) 15 m PNP 4-Wire Cable 2m - - 26.4V - Infrared IP69K 100 mA - 1 ms
RS Stock No. 124-0316
Mfr. Part No.OBD1000-R100-2EP-IO-V31
$110.64
Each
units
Block Diffuse 2 → 1000 mm NPN/PNP 4-Pin M8 Connector - IO-LINK 30V 4-Pin Connector LED IP67, IP69, IP69K 100 mA IO-Link 0.5 ms
RS Stock No. 284-3304
Mfr. Part No.E3SCL2
BrandOmron
$954.13
Each
units
Block Background Suppression 5 → 500 mm NPN 3-Wire Cable 2m - - 30V - Infrared IP67 100 mA - 2 ms
RS Stock No. 121-2725
Mfr. Part No.WTB8-P2131
BrandSick
$208.08
Each
units
Block Background Suppression 30 → 300 mm PNP 3-Pin M8 Connector - - 30V M8 LED IP67 30 mA - 0.5 ms
RS Stock No. 764-3907
Mfr. Part No.T18SP6DQ
BrandBanner
$189.17
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Barrel Diffuse 500 mm PNP 4-Pin M12 Connector - - 30V - Infrared IP69K 150 mA - 3 ms
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