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. 818-1621
Mfr. Part No.EE-SX672P
BrandOmron
HK$196.32
Each
units
Fork Through Beam (Fork) Maximum of 5 mm PNP 4-Pin Connector - 24V Connector Infrared IP50 12 mA - - PBT
RS Stock No. 358-7926
Mfr. Part No.WL260-R270
BrandSick
HK$1,537.13
Each
units
Block Retro-Reflective 0.01 → 15 m Relay Cable 240V 30V - LED IP67 3 A - <=20 ms ABS
RS Stock No. 729-5157
BrandRS PRO
HK$1,007.12
Each
units
Block Retroreflective 0.15 → 10 m PNP 4-Pin M12 Connector - 30V - LED IP67 100 mA - 2.5 ms ABS, PMMA
RS Stock No. 752-5060
Mfr. Part No.XUB2AKSNM12T
HK$310.01
Each
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Barrel Through Beam (Emitter) 15 m Solid State 4-Pin M12 Connector - 24V - Infrared IP65, IP67 100 mA - <1 ms PBT
RS Stock No. 817-1560
Mfr. Part No.RL31-8-2500-IR/73c/136
HK$701.99
Each
units
Block Diffuse 2500 mm Push Pull 4-Pin M12 Connector - 30V - LED IP67 100 mA - <=1 ms PC
RS Stock No. 288-9805
Mfr. Part No.WT150-P460
BrandSick
HK$1,447.17
Each
units
Block Diffuse 2 → 100 mm PNP 4-Pin M8 Connector - 30V - LED IP67 100 mA - <=0.5 ms ABS, PC
RS Stock No. 219-2296
Mfr. Part No.EE-SX672
BrandOmron
HK$212.45
Each
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Fork Through Beam (Fork) 5 mm NPN Connector - 24V - Infrared IP50 100 mA - - PBT
RS Stock No. 817-1557
Mfr. Part No.RL31-8-1200-RT/73c/136
HK$580.85
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Block Diffuse 1200 mm Push Pull 4-Pin M12 Connector - 30V - LED IP67 100 mA - <=1 ms PC
RS Stock No. 374-2072
Mfr. Part No.E3ZD822MOMS
BrandOmron
HK$874.00
Each
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Block Diffuse 1 m PNP 3-Wire Cable 2m - 26.4V - Infrared IP69K 100 mA - 1 ms PBT
RS Stock No. 542-5094
Mfr. Part No.FHDK 07P 6901 KS35A
BrandBaumer
HK$1,427.28
Each
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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. 450-2954
Mfr. Part No.OBT200-18GM60-E5-V1
HK$799.53
Each
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Barrel Diffuse 200 mm PNP 4-Pin M12 Connector - 30V - Infrared IP67 100 mA - <=1 ms Nickel Plated Brass
RS Stock No. 360-0451
Mfr. Part No.WT24-2R210
BrandSick
HK$3,149.18
Each
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- - - Relay - - - - LED IP69 - - <=10 ms Die Cast Zinc
RS Stock No. 842-8588
Mfr. Part No.WSE2S-2F1330
BrandSick
HK$1,345.56
Each
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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 ABS/PC, Plastic
RS Stock No. 450-2904
Mfr. Part No.OBS4000-18GM60-E5
HK$784.55
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Barrel Retroreflective 4 m PNP Cable - 30V - LED IP67 100 mA - 1 ms Nickel Plated Brass
RS Stock No. 739-6664
Mfr. Part No.OJ5052
HK$1,588.22
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Block Diffuse 15 → 200 mm PNP 4-Pin M8 Connector - 30V - LED IP67 200 mA - - ABS
RS Stock No. 818-1576
Mfr. Part No.EE-SX670P
BrandOmron
HK$172.04
Each
units
Fork Through Beam (Fork) Maximum of 5 mm PNP 4-Pin Connector - 24V Connector Infrared IP50 12 mA - - PBT
RS Stock No. 818-0299
Mfr. Part No.DS35-B15821
BrandSick
HK$4,687.48
Each
units
Block Background Suppression 50 → 3100 mm NPN/PNP 5-Pin M12 Connector - 30V M12 Connector Laser Light IP65, IP67 - IO-Link 2.5 ms, 6.5 ms, 12.5 ms, 24.5 ms, 96.5 ms Acrylic Glass, Plastic PC/ABS
RS Stock No. 617-0666
Mfr. Part No.E3ZLR86
BrandOmron
HK$1,257.02
Each
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Block Retroreflective 0.2 → 7 m PNP 4-Pin M8 Connector - 26.4V - LED IP67 100 mA - 1 ms PBT
RS Stock No. 512-4640
Mfr. Part No.XUK1ARCNL2
HK$819.97
Each
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Compact Retro-Reflective 7 m Relay Cable 240V 240V - Infrared IP65 3 A - <25 ms PBT
RS Stock No. 860-1291
Mfr. Part No.S18MBQ
BrandBanner
HK$3,679.68
Each
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Barrel - - Bipolar NPN/PNP 5-Pin M12 Connector - 30V - LED IP67 43 mA - 20 ms Thermoplastic Polyester