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 Communication Protocol Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface Response Time
RS Stock No. 752-5133
Mfr. Part No.XUB9BPANL2
HK$584.49
Each
units
Barrel Retroreflective 2 m PNP Cable - - 24V - LED IP65, IP67 100 mA - <1 ms
RS Stock No. 786-5918
Mfr. Part No.WL12L-2B530
BrandSick
HK$4,814.73
Each
units
Block Retroreflective 0 → 18 m NPN/PNP 5-Pin M12 Connector - - 30V - Laser Light IP67, IP69K 100 mA - 200 μs
RS Stock No. 768-5986
Mfr. Part No.E3FABP112M
BrandOmron
HK$785.93
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Barrel Clear Object Detection 100 → 500 mm PNP Pre-Wired Cable - - 30V - LED IP67, IP69K 25 mA - 0.5 ms
RS Stock No. 816-3673
Mfr. Part No.XU5M18MA230K
HK$913.38
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Block Diffuse 0.4 m Solid State 1/2 in-20 UNF Connector 240V - 240V Screw LED IP67 200 mA - <1 ms
RS Stock No. 905-5062
Mfr. Part No.BGL0019
BrandBALLUFF
HK$1,873.19
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Fork Through Beam (Fork) - PNP 3-Pin M8 Connector - - 30V M8 Laser Light IP67 - - -
RS Stock No. 124-0330
Mfr. Part No.OBE20M-R101-S2EP-IO-V31-L
HK$1,311.50
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Block Through Beam (Emitter and Receiver) 0 → 20 m NPN/PNP 4-Pin M8 Connector - IO-LINK 30V 4-Pin Connector Laser Light IP67, IP69, IP69K 100 mA IO-Link 0.4 ms
RS Stock No. 847-0331
Mfr. Part No.13104RQD07
BrandEaton
HK$1,779.03
Each
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Block Diffuse Maximum of 50 mm NPN/PNP 4-Pin Connector - - 30V - LED IP69K 100 (PNP) mA, 250 (NPN) mA - 1 ms
RS Stock No. 655-666
Mfr. Part No.FZAM 30P5002
BrandBaumer
HK$2,539.68
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Barrel Diffuse 300 → 1500 mm PNP 4-Wire Cable 2m - - 30V - Infrared IP65 100 mA - <2.5 ms
RS Stock No. 891-9514
Mfr. Part No.RLK31-8-2500-IR/31/115
HK$666.68
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Block Diffuse 0 → 2500 mm Relay 5-Wire Cable 2m 240V - 240V - Infrared IP67 40 mA - 25 ms
RS Stock No. 420-473
Mfr. Part No.E3SAR86
BrandOmron
HK$2,676.46
Each
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Block Retroreflective 0.1 → 2 m PNP M12 Connector - - 30V - LED IP67 100 mA - 0.5 ms
RS Stock No. 812-8213
Mfr. Part No.CY-192A-P-Z-Y
BrandPanasonic
HK$253.42
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Barrel Retroreflective 4 m PNP M12 Connector - - 24V - Infrared IP67 35 mA - 1 ms
RS Stock No. 743-1313
Mfr. Part No.E3Z-LS86
BrandOmron
HK$1,466.24
Each
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Block Background Suppression 20 → 200 mm PNP 4-Pin M8 Connector - - 26.4V - LED IP67 100 mA - 1 ms
RS Stock No. 902-7045
Mfr. Part No.BOS 5K-PU-LH12-S75
BrandBALLUFF
HK$1,240.78
Each
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Block Background Suppression 20 → 300 mm PNP 4-Pin M8 Connector - - 30V Connector LED IP67 100 mA - 0.25 ms
RS Stock No. 739-6673
Mfr. Part No.O1D100
HK$3,150.48
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Block Diffuse 0.2 → 10 m Analogue, PNP M12 Connector - - 30V - Laser Light IP67 200 mA - -
RS Stock No. 818-4103
Mfr. Part No.E3Z-T61 2M
BrandOmron
HK$1,177.18
Each
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Block Through Beam (Emitter and Receiver) Maximum of 15 mm NPN Cable - - 26.4V Pre-Wired LED IP67 100 mA - 1 ms
RS Stock No. 818-1699
Mfr. Part No.EE-SX772A
BrandOmron
HK$361.69
Each
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Fork Through Beam (Fork) Maximum of 5 mm NPN - - - 24V Pre-Wired Infrared IP60 100 mA - -
RS Stock No. 768-9464
Mfr. Part No.WL9-3P1162
BrandSick
HK$1,343.45
Each
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Block Retroreflective 0 → 0.4 m PNP - - - 30V - LED IP66, IP67, IP69K 100 mA - <0.5 ms
RS Stock No. 818-1520
Mfr. Part No.EE-SPY411
BrandOmron
HK$379.69
Each
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Block Convergent 2 → 5 mm NPN - - - 24V Connector Infrared IP50 50 mA - -
RS Stock No. 530-0939
Mfr. Part No.WTB4-3P2161
BrandSick
HK$1,504.60
Each
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Block Diffuse 4 → 150 mm PNP 3-Pin M8 Connector - - 30V - LED IP66, IP67 100 mA - <0.5 ms
RS Stock No. 818-1558
Mfr. Part No.E3JM-DS70M4T-US
BrandOmron
HK$2,000.05
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Block Diffuse Maximum of 700 mm Relay 5-Terminal Screw 250V - 5V - Infrared IP66 3 A - 30 ms
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