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. 770-7008
Mfr. Part No.WL250-2R1531
BrandSick
HK$1,461.62
Each
units
Block Retroreflective 0.01 → 15 m Relay 5-Wire Cable 2m 240V - 240V - LED IP67 - - <=15 ms
RS Stock No. 360-0451
Mfr. Part No.WT24-2R210
BrandSick
HK$3,256.45
Each
units
- - - Relay - - - - - LED IP69 - - <=10 ms
RS Stock No. 512-4656
Mfr. Part No.XUK9ARCNL2
HK$803.66
Each
units
Compact Retroreflective 5 m Relay 5-Wire Cable 2m 240V - 240V - LED IP65 3 A - <25 ms
RS Stock No. 372-8177
Mfr. Part No.E3ZR612M
BrandOmron
HK$640.63
Each
units
Block Retroreflective 100 mm → 4 m NPN 3-Wire Cable 2m - - 26.4V - LED IP69K 100 mA - 1 ms
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 - IO-LINK 30V M12 Connector Laser Light IP65, IP67 - IO-Link 2.5 ms, 6.5 ms, 12.5 ms, 24.5 ms, 96.5 ms
RS Stock No. 818-1576
Mfr. Part No.EE-SX670P
BrandOmron
HK$252.17
Each
units
Fork Through Beam (Fork) 5 mm PNP 4-Pin Connector - - 24V Connector Infrared IP50 12 mA - -
RS Stock No. 815-4174
Mfr. Part No.O300.GP-11110415
BrandBaumer
HK$1,624.48
Each
units
Block Diffuse 30 → 200 mm Push Pull 4-Pin M8 Connector - - 30V Cable LED IP67 45 mA - <0.49 ms
RS Stock No. 778-8704
Mfr. Part No.E3JK-RR11 2M
BrandOmron
HK$908.62
Each
units
Block Retroreflective 7 m, 100 mm Relay 5-Wire Cable 2m 240V - 240V Wire Lead LED IP64 - - 20 ms
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 - -
RS Stock No. 877-7405
Mfr. Part No.HG-C1050
BrandPanasonic
HK$3,279.26
Each
units
Block Background Suppression 50 mm NPN Cable - - 24V - Laser Light IP67 - - 1.5 (High Speed) ms, 5 (Standard) ms, 10 (High Precision) ms
RS Stock No. 860-1291
Mfr. Part No.S18MBQ
BrandBanner
HK$4,931.90
Each
units
Barrel - - Bipolar NPN/PNP 5-Pin M12 Connector - - 30V - LED IP67 43 mA - 20 ms
RS Stock No. 729-5117
BrandRS PRO
HK$678.96
Each
units
Barrel Retro-Reflective 0.05 → 7 m PNP Cable - - 30V - LED IP67 100 mA - <=0.5 ms
RS Stock No. 768-9470
Mfr. Part No.WTB9-3P1161
BrandSick
HK$1,655.06
Each
units
Block Background Suppression 20 → 350 mm PNP Pre-Wired Cable - - 30V - LED IP66, IP67, IP69K 100 mA - <0.333 ms
RS Stock No. 768-5986
Mfr. Part No.E3FABP112M
BrandOmron
HK$785.93
Each
units
Barrel Clear Object Detection 100 → 500 mm PNP Pre-Wired Cable - - 30V - LED IP67, IP69K 25 mA - 0.5 ms
RS Stock No. 361-5510
Mfr. Part No.EX-13A-PN
BrandPanasonic
HK$1,020.33
Each
units
Block Through Beam (Emitter and Receiver) 500 mm PNP 3-Wire Cable 2m - - 24V - LED IP67 50 mA - <=0.5 ms
RS Stock No. 847-0331
Mfr. Part No.13104RQD07
BrandEaton
HK$1,156.90
Each
units
Block Diffuse 5 mm NPN/PNP 4-Pin Connector - - 30V - LED IP69K 250 mA - 1 ms
RS Stock No. 901-2910
Mfr. Part No.EX-11A-PN
BrandPanasonic
HK$748.60
Each
units
Block Through Beam (Emitter and Receiver) 150 mm PNP Cable - - 24V Wire Lead LED IP67 10 mA - 0.5 ms
RS Stock No. 818-1558
Mfr. Part No.E3JM-DS70M4T-US
BrandOmron
HK$1,999.65
Each
units
Block Diffuse 700 mm Relay 5-Terminal Screw 250V - 5V - Infrared IP66 3 A - 30 ms
RS Stock No. 111-3700
Mfr. Part No.WLG4SC-3P2232A71
BrandSick
HK$1,837.82
Each
units
Block Retroreflective 0 → 5 m PNP 4-Pin M8 Connector - IO-LINK 30V 4-Pin M8 Connector LED IP66, IP67 100 mA IO-Link 300 → 450 μs
RS Stock No. 219-2319
Mfr. Part No.EE-SPX303N
BrandOmron
HK$386.32
Each
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Fork Through Beam (Fork) 13 mm NPN Non-Solder Connector - - 24V - Infrared IP50 80 mA - -
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