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 Terminal Type Light Source IP Rating Maximum Current Interface Response Time Housing Material
RS Stock No. 480-4985
Mfr. Part No.EQ501
BrandPanasonic
MYR786.22
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Block Diffuse 0.1 → 2.5 m Relay 4-Terminal Screw 250V 30V Screw Infrared IP67 3 A - <=20 ms ABS
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Mfr. Part No.CX-424
BrandPanasonic
MYR434.10
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Block Diffuse 100 mm NPN 2m Cable - 24V - Infrared IP67 100 mA - 1 ms PBT
RS Stock No. 818-1621
Mfr. Part No.EE-SX672P
BrandOmron
MYR110.63
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Fork Through Beam (Fork) Maximum of 5 mm PNP 4-Pin Connector - 24V Connector Infrared IP50 12 mA - - PBT
RS Stock No. 542-5094
Mfr. Part No.FHDK 07P 6901 KS35A
BrandBaumer
MYR675.65
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Block Diffuse 10 → 60 mm PNP 4-Pin M8 Connector - 30V - LED IP65 100 mA - <0.5 ms Polyamide
RS Stock No. 218-939
Mfr. Part No.WL100L-E2231
BrandSick
MYR734.93
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Block Retroreflective 0.08 → 12 m NPN 4-Pin M8 Connector - 30V - Laser Light IP65 100 mA - <0.25 ms ABS, PMMA
RS Stock No. 847-9508
Mfr. Part No.QS30FF200Q
BrandBanner
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Block Diffuse Maximum of 200 mm NPN/PNP 5-Pin M12 Connector - 30V - LED IP67 <40 mA - 2 ms ABS
RS Stock No. 821-0056
Mfr. Part No.E3Z-T61-D 2M
BrandOmron
MYR343.58
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Block Through Beam (Receiver) 15 m NPN 2/3-Wire Cable 2m - 24V Wire Lead Infrared IP67 20 mA - 1 ms PBT
RS Stock No. 808-9171
Mfr. Part No.CX-422
BrandPanasonic
MYR407.79
Each
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Block Diffuse 800 mm NPN 2m Cable - 24V - Infrared IP67 100 mA - 1 ms PBT
RS Stock No. 807-4551
Mfr. Part No.EE-SX1103
BrandOmron
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Block Diffuse - - - 1.6V - PCB Pin - - 50 mA - 10 μs -
RS Stock No. 818-1624
Mfr. Part No.EE-SX471
BrandOmron
MYR108.23
Each
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Fork Through Beam (Fork) Maximum of 5 mm NPN - - 24V Connector Infrared IP50 12 mA - - PBT
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Mfr. Part No.OBT200-18GM60-E5
MYR493.31
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Barrel Diffuse 200 mm PNP 4-Wire Cable 2m - 30V - Infrared IP67 100 mA - <=1 ms Nickel Plated Brass
RS Stock No. 786-5936
Mfr. Part No.WTB140-P430
BrandSick
MYR922.46
Each
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Block Background Suppression 2 → 500 mm PNP 4-Pin M8 Connector - 30V - LED IP67 100 mA - 0.5 ms PBT
RS Stock No. 695-6801
Mfr. Part No.XUB1APANM12
MYR279.24
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Barrel Retroreflective 4 m PNP 4-Pin M12 Connector - 24V - Infrared IP65, IP67 100 mA - <1 ms PBT
RS Stock No. 219-2410
Mfr. Part No.EE-SY672
BrandOmron
MYR123.26
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Block Retroreflective 1 → 5 mm NPN - - 24V - Infrared IP50 100 mA - - PBT
RS Stock No. 729-5117
BrandRS PRO
MYR455.22
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Barrel Retro-Reflective 0.05 → 7 m PNP Cable - 30V - LED IP67 100 mA - <=0.5 ms Nickel Plated Brass, PC
RS Stock No. 512-4640
Mfr. Part No.XUK1ARCNL2
MYR562.51
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Compact Retro-Reflective 7 m Relay Cable 240V 240V - Infrared IP65 3 A - <25 ms PBT
RS Stock No. 814-0345
Mfr. Part No.OGH500
MYR637.23
Each
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Barrel Diffuse 15 → 300 mm PNP M12 Connector - 36V Wire Lead LED IP67 25 mA - - Stainless Steel
RS Stock No. 219-2331
Mfr. Part No.EE-SPX403N
BrandOmron
MYR228.44
Each
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Fork Through Beam (Fork) 13 mm NPN Non-Solder Connector - 24V - Infrared IP50 80 mA - - PC
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Fork Through Beam 6 mm NPN/PNP 4-Pin M12 Connector - 24V - Infrared IP65 100 mA - <0.1 ms Polyamide
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