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 Maximum DC Voltage Optical Technology Terminal Type Light Source IP Rating Maximum Current Interface Response Time
RS Stock No. 463-8384
Mfr. Part No.RLK39-54/31/40A/116
kr 2 722,00
Each
Units
Block Retro-Reflective 7 m Relay 4-Terminal Screw 240V 240V - - LED IP67 3 A - <=20 ms
RS Stock No. 821-0066
Mfr. Part No.E3Z-T81-M1J-1 0.3M
BrandOmron
kr 1 074,68
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Block Through Beam (Emitter and Receiver) 15 m PNP Pre-Wired Cable - 24V - Wire Lead Infrared IP67 35 mA - 1 ms
RS Stock No. 812-8222
Mfr. Part No.CY-192B-P-Z-Y
BrandPanasonic
kr 271,46
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Units
Barrel Retroreflective 4 m PNP M12 Connector - 24V - - Infrared IP67 35 mA - 1 ms
RS Stock No. 857-3503
Mfr. Part No.PA18CLD04TOSA
kr 1 111,98
Each
Units
Barrel Diffuse Maximum of 400 mm Relay Cable 250V - - - LED IP67 10 mA - 20 (ON) ms, 30 (OFF) ms
RS Stock No. 729-5101
BrandRS PRO
kr 683,56
Each
Units
Barrel Retroreflective 0.05 7 m NPN 4-Pin M12 Connector - 30V - - LED IP67 100 mA - <=0.5 ms
RS Stock No. 847-9426
Mfr. Part No.QS18VP6RQ8
BrandBanner
kr 910,10
Each
Units
Barrel Through Beam (Receiver) 20 m PNP 4-Pin Connector - 30V - - LED IP67 <25 mA - 375 (OFF) μs, 750 (ON) μs
RS Stock No. 695-6836
Mfr. Part No.XUK1APANM12
kr 596,93
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Compact Retroreflective 7 m PNP 4-Pin M12 Connector - 24V - - Infrared IP65 100 mA - <2 ms
RS Stock No. 458-838
Mfr. Part No.WTB12-3P1131
BrandSick
kr 2 060,00
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Block Retroreflective 20 350 mm PNP Cable - 30V - - LED IP69K 100 mA - <=330 μs
RS Stock No. 812-8156
Mfr. Part No.CX-412A-P-C05
BrandPanasonic
kr 649,40
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Units
- - - PNP - - - - - LED IP67 - - 1 ms
RS Stock No. 425-8130
Mfr. Part No.OJ5004
kr 1 180,45
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Block Retroreflective 2 m PNP M8 Connector - 30V - - LED IP67 200 mA - -
RS Stock No. 752-5102
Mfr. Part No.XUB0BNSNL2
kr 718,82
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Barrel Multimode 0.12 (Diffuse with Background Suppression) m, 0.3 (Diffuse) m, 2 (Polarised Reflex) m, 15 (Through Beam) m NPN Cable - 24V - - Infrared IP65, IP67 100 mA - <2 ms
RS Stock No. 818-1611
Mfr. Part No.EE-SX674
BrandOmron
kr 333,10
Each
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Fork Through Beam (Fork) Maximum of 5 mm NPN 4-Pin Connector - 24V - Connector Infrared IP50 12 mA - -
RS Stock No. 530-0838
Mfr. Part No.WL27-3R2631
BrandSick
kr 2 070,00
Each
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Block Retroreflective 0.1 15 m Relay Q6 Connector 250V 24V - - LED IP65 3 A ac, 32 A dc - <=10 ms
RS Stock No. 358-7926
Mfr. Part No.WL260-R270
BrandSick
kr 1 340,00
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Block Retroreflective 0.01 15 m Relay 5-Terminal Screw 240V 30V - - LED IP67 3 A - <=20 ms
RS Stock No. 847-9568
Mfr. Part No.QS30RRXQ
BrandBanner
kr 1 604,89
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Barrel Through Beam (Receiver) Maximum of 213 m NPN/PNP 5-Pin M12 Connector - 30V - - LED IP67 <22 mA - 30 ms
RS Stock No. 729-5135
BrandRS PRO
kr 797,33
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Block Diffuse 40 1000 mm NPN 4-Pin M12 Connector - 30V - - LED IP67 100 mA - <=2.5 ms
RS Stock No. 444-3603
Mfr. Part No.XUX0AKSAT16T
kr 701,14
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Block Through Beam (Emitter) 40 m - 3-Terminal Screw - 24V - - Infrared IP65, IP67 100 mA - <2 ms
RS Stock No. 198-0575
Mfr. Part No.E3SGS3B4
BrandOmron
kr 2 437,00
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Units
Fork Through Beam (Fork) 30 mm PNP 3-Wire Cable 2m - 24V - - Infrared IP67 100 mA - 1 ms
RS Stock No. 812-8187
Mfr. Part No.CY-191A-P-Z-Y
BrandPanasonic
kr 425,09
Each
Units
Barrel Retroreflective 2 m PNP M12 Connector - 24V - - LED IP67 35 mA - 1 ms
RS Stock No. 842-8588
Mfr. Part No.WSE2S-2F1330
BrandSick
kr 1 150,00
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Block Through Beam (Emitter and Receiver) 0 2.5 m PNP 2-Wire Cable 2m - 30V - - LED IP67 20 mA - <0.4 ms
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