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. 739-6664
Mfr. Part No.OJ5052
HK$1,588.22
Each
units
Block Diffuse 15 → 200 mm PNP 4-Pin M8 Connector - 30V - LED IP67 200 mA - - ABS
RS Stock No. 818-0299
Mfr. Part No.DS35-B15821
BrandSick
HK$4,687.48
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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. 729-5117
BrandRS PRO
HK$754.83
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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. 512-4656
Mfr. Part No.XUK9ARCNL2
HK$787.90
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Compact Retroreflective 5 m Relay 5-Wire Cable 2m 240V 240V - LED IP65 3 A - <25 ms PBT
RS Stock No. 405-7252
Mfr. Part No.T18SP6R
BrandBanner
HK$635.36
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Barrel Through Beam (Receiver) 20 m PNP 4-Wire Cable 2m - 30V - Infrared IP69K 150 mA - 3 ms PBT, Plastic
RS Stock No. 512-4640
Mfr. Part No.XUK1ARCNL2
HK$819.97
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Compact Retro-Reflective 7 m Relay Cable 240V 240V - Infrared IP65 3 A - <25 ms PBT
RS Stock No. 778-8704
Mfr. Part No.E3JK-RR11 2M
BrandOmron
HK$922.59
Each
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Block Retroreflective 7 m, 100 mm Relay 5-Wire Cable 2m 240V 240V Wire Lead LED IP64 - - 20 ms ABS
RS Stock No. 919-6585
Mfr. Part No.WTB9-3P2261
BrandSick
HK$1,497.17
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Block Background Suppression 20 → 350 mm PNP 4-Pin M8 Connector - 30V M8 LED IP66, IP67, IP69K 30 mA - <0.333 ms VISTAL Plastic
RS Stock No. 842-8588
Mfr. Part No.WSE2S-2F1330
BrandSick
HK$1,345.56
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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. 770-7008
Mfr. Part No.WL250-2R1531
BrandSick
HK$896.76
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Block Retroreflective 0.01 → 15 m Relay 5-Wire Cable 2m 240V 240V - LED IP67 - - <=15 ms ABS
RS Stock No. 815-4174
Mfr. Part No.O300.GP-11110415
BrandBaumer
HK$1,412.16
Each
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Block Diffuse 30 → 200 mm Push Pull 4-Pin M8 Connector - 30V Cable LED IP67 45 mA - <0.49 ms ASA, PMMA
RS Stock No. 458-840
Mfr. Part No.WTB12-3P2411
BrandSick
HK$2,362.93
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- - - PNP - - - - LED IP66, IP67, IP69 - - <=330 μs Metal
RS Stock No. 512-4662
Mfr. Part No.XUK5ARCNL2
HK$923.26
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Compact Diffuse 1 m Relay 5-Wire Cable 2m 240V 240V - Infrared IP65 3 A - <25 ms PBT
RS Stock No. 701-8803
Mfr. Part No.WLG4S-3P2232V
BrandSick
HK$1,916.41
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Block Retroreflective 5 m PNP 4-Pin M8 Connector - 30V - LED IP69K 100 mA - <=0.5 ms Stainless Steel
RS Stock No. 714-1669
Mfr. Part No.M100/MV100-RT/76a/95/103
HK$888.80
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Block Through Beam (Emitter and Receiver) 10 m PNP 4-Pin M8 Connector - 30V - LED IP67 100 mA - 0.5 ms PC
RS Stock No. 712-5487
Mfr. Part No.E3H2-DS10B4M-M1
BrandOmron
HK$890.45
Each
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Barrel Diffuse 100 mm PNP M12 Connector - 30V - Infrared IP67 100 mA - 1.1 ms Nickel Plated Brass
RS Stock No. 818-1674
Mfr. Part No.E3T-ST13
BrandOmron
HK$1,252.85
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Block Through Beam (Emitter and Receiver) Maximum of 1 m PNP - - 26.4V Pre-Wired LED IP67 50 mA - 1 ms PBT
RS Stock No. 617-0622
Mfr. Part No.E3Z-LT86
BrandOmron
HK$1,694.66
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Block Through Beam (Emitter and Receiver) 60 m PNP 4-Pin M8 Connector - 26.4V - LED IP67 100 mA - 1 ms PBT
RS Stock No. 729-9070
Mfr. Part No.E3Z-G82 (HK)
BrandOmron
HK$930.54
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Fork Through Beam 25 mm PNP Pre-Wired Cable - 26.4V - Infrared IP64 100 mA - 1 ms ABS
RS Stock No. 191-9949
Mfr. Part No.OF5027
HK$1,154.43
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Barrel Diffuse 1 → 400 mm PNP M12 Connector - 36V - Infrared IP65 200 mA - - Optalloy Plated Brass
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