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. 326-7228
Mfr. Part No.E3TST142M
BrandOmron
MYR801.95
Each
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Block Through Beam (Emitter and Receiver) 1 m PNP 3-Wire Cable 2m - 26.4V - LED IP67 50 mA - 1 ms PBT
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Mfr. Part No.RLK39-8-2000-Z/31/40A/116
MYR1,052.40
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Block Diffuse 2000 mm Relay 4-Terminal Screw 240V 240V - Infrared LED IP67 3 A - <=20 ms PBT
RS Stock No. 784-0000
Mfr. Part No.RL28-8-H-1500-LAS/47/105
MYR1,585.62
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Block Background Suppression 50 → 1500 mm PNP 5-Pin M12 Connector - 30V - Laser Light IP67 200 mA - 3.5 ms ABS Plastic
RS Stock No. 124-0316
Mfr. Part No.OBD1000-R100-2EP-IO-V31
MYR399.14
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Block Diffuse 2 → 1000 mm NPN/PNP 4-Pin M8 Connector - 30V 4-Pin Connector LED IP67, IP69, IP69K 100 mA IO-Link 0.5 ms PC
RS Stock No. 764-3900
Mfr. Part No.T186EQ
BrandBanner
MYR241.79
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Barrel Through Beam (Emitter) 20 m - 4-Pin M12 Connector - 30V - Infrared IP69K 150 mA - 3 ms Thermoplastic PET
RS Stock No. 817-1605
Mfr. Part No.RLK31-54/31/115
MYR322.11
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Block Retroreflective 9000 mm Push Pull 5-Wire Cable 2m 240V 240V - LED IP67 3 A - <=25 ms PC
RS Stock No. 908-7110
Mfr. Part No.OPB745
BrandOptek
MYR11.53
Each
units
- - - - - - - - - - - - - -
RS Stock No. 458-838
Mfr. Part No.WTB12-3P1131
BrandSick
MYR1,256.69
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Block Retroreflective 20 → 350 mm PNP Cable - 30V - LED IP69K 100 mA - <=330 μs Metal
RS Stock No. 818-4092
Mfr. Part No.EESPY412CHN
BrandOmron
MYR218.69
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Block Convergent 2 → 5 mm NPN - - 24V Connector Infrared IP50 80 mA - - PC
RS Stock No. 321-5261
Mfr. Part No.WT150-N132
BrandSick
MYR534.49
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Block Diffuse 10 → 250 mm NPN 5-Wire Cable 2m - 30V - LED IP67 100 mA - <=0.5 ms ABS, PC
RS Stock No. 729-5182
BrandRS PRO
MYR699.32
Each
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Block Background Suppression 10 → 140 mm NPN 2-Wire Cable 2m - 24V - LED IP67 100 mA - <625 μs ABS, PC
RS Stock No. 125-4531
Mfr. Part No.PM-R25
BrandPanasonic
MYR106.46
Each
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Fork Through Beam (Fork) 6 mm NPN 1m Cable - 24V Cable Infrared IP64 50 (Sink Current) mA - 20 (Received) μs, 80 (Interrupted) μs PBT (Enclosure), Polycarbonate (Display Section)
RS Stock No. 198-0575
Mfr. Part No.E3SGS3B4
BrandOmron
MYR1,879.82
Each
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Fork Through Beam (Fork) 30 mm PNP 3-Wire Cable 2m - 24V - Infrared IP67 100 mA - 1 ms Metal
RS Stock No. 463-8390
Mfr. Part No.RLK39-54-Z/31/40A/116
MYR941.80
Each
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Block Retro-Reflective 7 m Relay 4-Terminal Screw 240V 240V - LED IP67 3 A - <=20 ms PBT
RS Stock No. 265-9250
Mfr. Part No.T18SN6FF100Q
BrandBanner
MYR704.31
Each
units
Barrel Diffuse 100 mm NPN M12 Connector - 30V - LED IP69K 150 mA - - PBT, Plastic
RS Stock No. 303-2189
Mfr. Part No.E3TSL112M
BrandOmron
MYR559.12
Each
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Block Retroreflective 5 → 15 mm NPN Pre-Wired Cable - 26.4V - LED IP67 50 mA - 1 ms PBT
RS Stock No. 374-3788
Mfr. Part No.E3ZD87
BrandOmron
MYR564.85
Each
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Block Diffuse 1 m PNP 4-Pin M8 Connector - 26.4V - Infrared IP69K 100 mA - 1 ms PBT
RS Stock No. 768-5936
Mfr. Part No.E3FADP23
BrandOmron
MYR346.79
Each
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Barrel Diffuse 1 m PNP 4-Pin M12 Connector - 30V - LED IP67, IP69K 25 mA - 0.5 ms ABS
RS Stock No. 812-8099
Mfr. Part No.CY-111B-P-Z
BrandPanasonic
MYR245.05
Each
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Barrel Through Beam (Emitter and Receiver) 15 m PNP M12 Connector - 24V - Infrared IP67 35 mA - 1 ms PBT
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Mfr. Part No.EQ501T
BrandPanasonic
MYR1,250.69
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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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