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. 778-8713
Mfr. Part No.E3JK-RR12 2M
BrandOmron
MYR507.07
Each
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Block Retro-Reflective 6 m, 100 mm Relay Cable 240V 240V Wire Lead LED IP64 - - 20 ms ABS
RS Stock No. 374-2038
Mfr. Part No.E3ZR812M
BrandOmron
MYR538.76
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Block Retroreflective 100 mm → 4 m PNP 4-Pin M8 Connector 2m Cable - 26.4V - LED IP69K 100 mA - 1 ms PBT
RS Stock No. 617-0694
Mfr. Part No.E3Z-LL86
BrandOmron
MYR740.25
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Block Background Suppression 20 → 300 mm PNP M8 Connector - 26.4V - LED IP67 100 mA - 1 ms PBT
RS Stock No. 372-8177
Mfr. Part No.E3ZR612M
BrandOmron
MYR446.04
Each
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Block Retroreflective 100 mm → 4 m NPN 3-Wire Cable 2m - 26.4V - LED IP69K 100 mA - 1 ms PBT
RS Stock No. 265-9222
Mfr. Part No.T18SP6LPQ
BrandBanner
MYR536.15
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Barrel Retroreflective 50 → 2000 mm PNP M12 Connector - 30V - LED IP69K 150 mA - - PBT, Plastic
RS Stock No. 898-6713
Mfr. Part No.115970 MV12-F1/82b/124/128
MYR767.56
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Block Through Beam (Receiver) 0 → 16 (Effective) m PNP 5-Pin M12 Connector 300V 30V M12 LED IP67 45 mA - 0.5 ms Fibreglass Reinforced Plastic PC (Laterals)
RS Stock No. 898-6719
Mfr. Part No.115969 M12-F1/76b/124
MYR563.39
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Block Through Beam (Emitter) 0 → 16 (Effective) m PNP 5-Pin M12 Connector 300V 30V M12 LED IP67 35 mA - 0.5 ms Fibreglass Reinforced Plastic PC (Laterals)
RS Stock No. 450-2926
Mfr. Part No.OBT200-18GM60-E4
MYR431.19
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Barrel Diffuse 200 mm NPN 4-Wire Cable 2m - 30V - Infrared IP67 100 mA - <=1 ms Nickel Plated Brass
RS Stock No. 891-9501
Mfr. Part No.ML7-8-H-350-IR/59/65a/136/143
MYR1,067.61
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Block Background Suppression 10 → 350 mm Push Pull 4-Pin M8 Connector - 30V M8 Connector Infrared IP67, IP69K <20 mA - 2 ms PC
RS Stock No. 808-9121
Mfr. Part No.CX-411
BrandPanasonic
MYR587.73
Each
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Block Through Beam (Emitter and Receiver) 10 m NPN 3-Wire Cable 2m - 24V - LED IP67 100 mA - 1 ms PBT
RS Stock No. 219-2296
Mfr. Part No.EE-SX672
BrandOmron
MYR112.09
Each
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Fork Through Beam (Fork) 5 mm NPN Connector - 24V - Infrared IP50 100 mA - - PBT
RS Stock No. 822-4645
Mfr. Part No.E3Z-T61-L
BrandOmron
MYR299.80
Each
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Block Through Beam (Emitter) 60 m NPN 2/3-Wire Cable 2m - 24V - - IP67 35 mA - 1 ms PBT
RS Stock No. 615-9322
Mfr. Part No.E3T-SR24
BrandOmron
MYR548.79
Each
units
Block Retroreflective 10 → 200 mm PNP Pre-Wired Cable - 26.4V - LED IP67 50 mA - 1 ms PBT
RS Stock No. 493-7243
Mfr. Part No.WT18-3P130
BrandSick
MYR1,291.69
Each
units
Block Diffuse 50 → 600 mm PNP Cable - 30V - LED IP67 100 mA - <700 μs ABS
RS Stock No. 770-7001
Mfr. Part No.WTB250-2P2441
BrandSick
MYR642.66
Each
units
Block Background Suppression 150 → 500 mm PNP 4-Pin M12 Connector - 30V - LED IP67 100 mA - <=3 ms ABS
RS Stock No. 219-2274
Mfr. Part No.EE-SX670
BrandOmron
MYR151.91
Each
units
Fork Through Beam (Fork) 5 mm NPN Connector - 24V - Infrared IP50 100 mA - - PBT
RS Stock No. 306-2168
Mfr. Part No.E3T-FD14
BrandOmron
MYR587.70
Each
units
Block Diffuse 5 → 30 mm PNP Pre-Wired Cable - 26.4V - LED IP67 50 mA - 1 ms PBT
RS Stock No. 178-6266
Mfr. Part No.E3S AD31
BrandOmron
MYR802.86
Each
units
Block Diffuse 200 mm PNP 4-Wire Cable 2m - 30V - LED IP67 100 mA - 0.5 ms PBT
RS Stock No. 361-5560
Mfr. Part No.EX-14B-PN
BrandPanasonic
MYR456.04
Each
units
Block Retroreflective 2 → 25 mm PNP Cable - 24V - LED IP67 50 mA - <=0.5 ms PET
RS Stock No. 360-0451
Mfr. Part No.WT24-2R210
BrandSick
MYR1,390.32
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- - - Relay - - - - LED IP69 - - <=10 ms Die Cast Zinc
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