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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Omschrijving Prijs Sensor Style Detection Type Detection Range Output Type Electrical Connection Maximum AC Voltage Communication Protocol Maximum DC Voltage Optical Technology Terminal Type Light Source IP Rating Maximum Current Interface
RS-stocknr. 122-0713
FabrikantnummerWL100-2P4439
FabrikantSick
€ 79,04
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Aantal stuks
Block Retroreflective 10 mm → 7.2 m PNP 4-Pin M8 Connector - - 30V - M8 Connector LED IP67 >30 mA -
RS-stocknr. 289-2491
FabrikantnummerWL150-P430
FabrikantSick
€ 117,52
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Block Retroreflective 2.4 m PNP 4-Pin M8 Connector - - 30V - - LED IP67 100 mA -
RS-stocknr. 768-9461
FabrikantnummerWL9-3P2430
FabrikantSick
€ 117,52
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Aantal stuks
Block Retroreflective 0 → 4 m PNP 4-Pin M12 Connector - - 30V - - LED IP66, IP67, IP69K 100 mA -
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FabrikantnummerDS35-B15821
FabrikantSick
€ 407,00
Each
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Block Background Suppression 50 → 3100 mm NPN/PNP 5-Pin M12 Connector - IO-LINK 30V - M12 Connector Laser Light IP65, IP67 - IO-Link
RS-stocknr. 786-5918
FabrikantnummerWL12L-2B530
FabrikantSick
€ 479,00
Each
Aantal stuks
Block Retroreflective 0 → 18 m NPN/PNP 5-Pin M12 Connector - - 30V - - Laser Light IP67, IP69K 100 mA -
RS-stocknr. 786-5885
FabrikantnummerWT18-3P410
FabrikantSick
€ 261,04
Each
Aantal stuks
Block Background Suppression 10 → 750 mm PNP 4-Pin M12 Connector - - 30V - - Infrared IP67 100 mA -
RS-stocknr. 458-844
FabrikantnummerWL12G-3B2531
FabrikantSick
€ 256,00
Each
Aantal stuks
Block Retroreflective 4 m NPN/PNP 5-Pin M12 Connector - - 30V - - LED IP69K 100 mA -
RS-stocknr. 288-9805
FabrikantnummerWT150-P460
FabrikantSick
€ 145,60
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Aantal stuks
Block Diffuse 2 → 100 mm PNP 4-Pin M8 Connector - - 30V - - LED IP67 100 mA -
RS-stocknr. 288-9782
FabrikantnummerWT150-P162
FabrikantSick
€ 145,60
Each
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Block Diffuse 2 → 100 mm PNP 4-Wire Cable 2m - - 30V - - LED IP67 100 mA -
RS-stocknr. 360-0451
FabrikantnummerWT24-2R210
FabrikantSick
€ 339,00
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- - - Relay - - - - - - LED IP69 - -
RS-stocknr. 919-6582
FabrikantnummerWTB2S-2P3251
FabrikantSick
€ 131,04
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Aantal stuks
Block Background Suppression 1 → 150 mm PNP 4-Pin M8 Connector - - 30V - M8 LED IP67 20 mA -
RS-stocknr. 786-5851
FabrikantnummerWL260-S270
FabrikantSick
€ 158,08
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Block Retroreflective 100 mm → 15 m Relay 5-Terminal Screw 240V - 240V - - LED IP67 3 A -
RS-stocknr. 493-7322
FabrikantnummerWF15-40B410
FabrikantSick
€ 185,12
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Fork Through Beam (Fork) 15 mm NPN/PNP 4-Pin M8 Connector - - 30V - - Infrared IP65 100 mA -
RS-stocknr. 219-033
FabrikantnummerDT20-P254B
FabrikantSick
€ 730,00
Each
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Block Background Suppression 50 → 150 mm PNP 5-Pin M12 Connector - - 30V - - Laser Light IP65 100 mA -
RS-stocknr. 121-2722
FabrikantnummerWTB11-2P2461
FabrikantSick
€ 130,00
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Block Background Suppression 30 → 1100 mm PNP 4-Pin M12 Connector - - 30V - M12 LED IP66, IP67, IP69K 30 mA -
RS-stocknr. 786-5911
FabrikantnummerWL150-P420
FabrikantSick
€ 131,04
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Aantal stuks
Block Retroreflective 10 → 700 mm PNP 4-Pin M8 Connector - - 30V - - LED IP67 100 mA -
RS-stocknr. 842-8560
FabrikantnummerWTB2S-2P3130
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€ 120,64
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Block Background Suppression 1 → 36 mm PNP 3-Pin M8 Connector 0.2m Cable - - 30V - M8 LED IP67 20 mA -
RS-stocknr. 784-6692
FabrikantnummerDT50-P1123
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€ 359,00
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Block Background Suppression 200 → 10000 mm Analogue 5-Pin M12 Connector - - 30V - - Laser Light IP65 100 mA -
RS-stocknr. 770-7008
FabrikantnummerWL250-2R1531
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€ 141,44
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Block Retroreflective 100 mm → 15 m Relay 5-Wire Cable 2m 240V - 240V - - LED IP67 - -
RS-stocknr. 768-9464
FabrikantnummerWL9-3P1162
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€ 130,00
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Block Retroreflective 0 → 0.4 m PNP - - - 30V - - LED IP66, IP67, IP69K 100 mA -