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 Optical Technology Terminal Type Light Source IP Rating Maximum Current Interface Response Time
RS Stock No. 288-9805
Mfr. Part No.WT150-P460
BrandSick
kr 1 260,00
Each
Units
Block Diffuse 2 100 mm PNP 4-Pin M8 Connector - 30V - - LED IP67 100 mA - <=0.5 ms
RS Stock No. 729-5113
BrandRS PRO
kr 740,76
Each
Units
Barrel Retroreflective 0.05 → 7 m PNP 4-Pin M12 Connector - 30V - - LED IP67 100 mA - <=0.5 ms
RS Stock No. 816-0400
Mfr. Part No.E3FCTP21
BrandOmron
kr 1 167,00
Each
Units
Barrel Through Beam (Emitter and Receiver) 20 m PNP M12 Connector - 30V - Cable LED IP67, IP68, IP69K 40 mA - 0.5 ms
RS Stock No. 898-6719
Mfr. Part No.115969 M12-F1/76b/124
kr 1 136,00
Each
Units
Block Through Beam (Emitter) 0 16 (Effective) m PNP 5-Pin M12 Connector 300V 30V - M12 LED IP67 35 mA - 0.5 ms
RS Stock No. 775-4230
Mfr. Part No.E3FBRN22
BrandOmron
kr 655,98
Each
Units
Barrel Retroreflective 0 500 mm NPN 4-Pin M12 Connector - 30V - - LED IP67, IP69K 25 mA - 0.5 ms
RS Stock No. 444-3530
Mfr. Part No.XUK0AKSAM12
kr 868,09
Each
Units
Compact Through Beam (Emitter) 0.28 m, 0.8 m, 4 m, 30 m NPN/PNP 4-Pin M12 Connector - 24V - - Infrared IP65 100 mA - <2 ms
RS Stock No. 815-4186
Mfr. Part No.O500.GR-11096062
BrandBaumer
kr 1 100,60
Each
Units
Block Background Suppression 30 600 mm Push Pull 3-Pin M12 Connector - 30V - Cable LED IP67 40 mA - <1 ms
RS Stock No. 201-8075
Mfr. Part No.E3SCL1
BrandOmron
kr 2 622,00
Each
Units
Block Background Suppression 5 200 mm NPN 3-Wire Cable 2m - 30V - - LED IP67 100 mA - 1 ms
RS Stock No. 786-5927
Mfr. Part No.WT24-2B410
BrandSick
kr 2 650,00
Each
Units
Block Background Suppression 100 2500 mm NPN/PNP 4-Pin M12 Connector - 30V - - Infrared IP69K 100 mA - 500 μs
RS Stock No. 510-3160
Mfr. Part No.MLV12-54/76B/124/128
kr 1 859,00
Each
Units
Block Retroreflective 6.5 m Push Pull 5-Pin M12 Connector - 30V - - LED IP67 200 mA - 0.5 ms
RS Stock No. 752-5067
Mfr. Part No.XUB2BKSNL2T
kr 323,17
Each
Units
Barrel Through Beam (Emitter) 15 m Solid State 3-Wire Cable 2m - 24V - - Infrared IP65, IP67 100 mA - <1 ms
RS Stock No. 877-7398
Mfr. Part No.HG-C1050-P
BrandPanasonic
kr 4 270,82
Each
Units
Block Background Suppression 50 mm PNP Cable - 24V - - Laser Light IP67 - - 1.5 (High Speed) ms, 5 (Standard) ms, 10 (High Precision) ms
RS Stock No. 458-840
Mfr. Part No.WTB12-3P2411
BrandSick
kr 2 060,00
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- - - PNP - - - - - LED IP66, IP67, IP69 - - <=330 μs
RS Stock No. 763-7895
Mfr. Part No.VTF18-4P1240
BrandSick
kr 760,00
Each
Units
Barrel Background Suppression 3 100 mm PNP 4-Pin M12 Connector - 30V - - Infrared IP67 100 mA - <=2 ms
RS Stock No. 847-9366
Mfr. Part No.QS18VP6LLPQ8
BrandBanner
kr 2 100,06
Each
Units
Barrel Retroreflective 0.1 10 m PNP 4-Pin M12 Connector - 30V - - Laser Light IP67 <15 mA - 700 μs
RS Stock No. 783-9971
Mfr. Part No.RL28-8-H-2000-IR/47/105
kr 3 634,00
Each
Units
Block Background Suppression 20 2000 mm PNP 5-Pin M12 Connector - 30V - - Infrared IP67 200 mA - 2 ms
RS Stock No. 768-9467
Mfr. Part No.WL9-3P1132
BrandSick
kr 1 230,00
Each
Units
Block Retroreflective 0 5 m PNP - - 30V - - LED IP66, IP67, IP69K 100 mA - <0.5 ms
RS Stock No. 743-1313
Mfr. Part No.E3Z-LS86
BrandOmron
kr 1 316,00
Each
Units
Block Background Suppression 20 200 mm PNP 4-Pin M8 Connector - 26.4V - - LED IP67 100 mA - 1 ms
RS Stock No. 768-9473
Mfr. Part No.WTB9-3P2461
BrandSick
kr 1 510,00
Each
Units
Block Background Suppression 20 350 mm NPN/PNP 4-Pin M12 Connector - 30V - - LED IP66, IP67, IP69K 100 mA - <0.333 ms
RS Stock No. 778-8716
Mfr. Part No.E3JK-TR11 2M
BrandOmron
kr 919,00
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Block Through Beam (Emitter and Receiver) 40 m Relay 5-Wire Cable 2m 240V 240V - Wire Lead LED IP64 - - 20 ms
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