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. 786-5889
Mfr. Part No.VL18-4P3240
BrandSick
kr 790,00
Each
Units
Barrel Retroreflective 0.05 3.7 m PNP 4-Pin M12 Connector - 30V - - LED IP67 100 mA - 2 ms
RS Stock No. 778-8707
Mfr. Part No.E3JK-DR11 2M
BrandOmron
kr 710,50
Each
Units
Block Diffuse 2.5 m Relay 5-Wire Cable 2m 240V 240V - Wire Lead LED IP64 - - 20 ms
RS Stock No. 729-5117
BrandRS PRO
kr 692,70
Each
Units
Barrel Retroreflective 0.05 7 m PNP 4-Wire Cable 2m - 30V - - LED IP67 100 mA - <=0.5 ms
RS Stock No. 512-4640
Mfr. Part No.XUK1ARCNL2
kr 659,28
Each
Units
Compact Retroreflective 7 m Relay 5-Wire Cable 2m 240V 240V - - Infrared IP65 3 A - <25 ms
RS Stock No. 695-6814
Mfr. Part No.XUB2BKSNM12T
kr 316,84
Each
Units
Barrel Through Beam (Emitter) 15 m Relay 4-Pin M12 Connector - 24V - - Infrared IP65, IP67 100 mA - <1 ms
RS Stock No. 742-0798
Mfr. Part No.XUVE04M3KSNM8
kr 980,77
Each
Units
Fork Through Beam 3 mm NPN/PNP 4-Pin M8 Connector - 24V - - Infrared IP65 100 mA - 50 μs
RS Stock No. 778-8713
Mfr. Part No.E3JK-RR12 2M
BrandOmron
kr 710,50
Each
Units
Block Retroreflective 6 m, 100 mm Relay 5-Wire Cable 2m 240V 240V - Wire Lead LED IP64 - - 20 ms
RS Stock No. 686-2211
Mfr. Part No.XUM2AKCNM8T
kr 302,14
Each
Units
Block Through Beam (Emitter) 15 m Relay 4-Pin M8 Connector - 24V - - LED IP65, IP67 100 mA - 0.5 ms
RS Stock No. 877-7391
Mfr. Part No.HG-C1100-P
BrandPanasonic
kr 4 270,82
Each
Units
Block Background Suppression 100 mm NPN/PNP 5-Wire Cable 2m - 24V - - Laser Light IP67 - - 1.5 (High Speed) ms, 5 (Standard) ms, 10 (High Precision) ms
RS Stock No. 786-5851
Mfr. Part No.WL260-S270
BrandSick
kr 1 280,00
Each
Units
Block Retroreflective 0.01 15 m Relay 5-Terminal Screw 240V 240V - - LED IP67 3 A - 20 ms
RS Stock No. 739-6673
Mfr. Part No.O1D100
kr 3 050,82
Each
Units
Block Diffuse 0.2 10 m PNP M12 Connector - 30V - - Laser Light IP67 200 mA - -
RS Stock No. 444-3451
Mfr. Part No.XUB0BPSNM12
kr 710,54
Each
Units
Barrel Multimode 0.12 m, 0.3 m, 2 m, 15 m PNP 4-Pin M12 Connector - 24V - - Infrared IP65, IP67 100 mA - <2 ms
RS Stock No. 219-033
Mfr. Part No.DT20-P254B
BrandSick
kr 6 650,00
Each
Units
Block Background Suppression 50 150 mm PNP 5-Pin M12 Connector - 30V - - Laser Light IP65 100 mA - 2.8 ms
RS Stock No. 741-7610
Mfr. Part No.VTE18-4P8240V
BrandSick
kr 910,00
Each
Units
Barrel Diffuse 900 mm PNP 4-Pin M12 Connector - 30V - - Infrared IP67, IP68, IP69K 100 mA - <=1 ms
RS Stock No. 444-3625
Mfr. Part No.XUX0ARCTT16T
kr 753,38
Each
Units
Block Through Beam (Emitter) 40 m - 3-Terminal Screw 240V 240V - - Infrared IP65, IP67 3 A, 500 mA - <25 ms
RS Stock No. 371-4651
Mfr. Part No.VL18-3P3840
BrandSick
kr 780,00
Each
Units
Barrel Retroreflective 0.005 → 3.7 m PNP 4-Pin M12 Connector - 30V - - LED IP67 100 mA - <=2 ms
RS Stock No. 686-2223
Mfr. Part No.XUM2APCNM8R
kr 820,11
Each
Units
Block Through Beam (Receiver) 15 m PNP 4-Pin M8 Connector - 24V - - LED IP65, IP67 100 mA - 0.5 ms
RS Stock No. 256-449
Mfr. Part No.E3JMDS70M4G
BrandOmron
kr 1 516,00
Each
Units
Block Diffuse 700 mm Relay 5-Terminal Screw 250V 5V - - Infrared IP66 3 A - 30 ms
RS Stock No. 487-898
Mfr. Part No.O1D106
kr 3 345,93
Each
Units
Block Background Suppression 1 75 m PNP M12 Connector - 30V - - Laser Light IP67 200 mA - -
RS Stock No. 847-9407
Mfr. Part No.QS18VP6R
BrandBanner
kr 768,70
Each
Units
Barrel Through Beam (Receiver) 20 m PNP Cable - 30V - - LED IP67 <25 mA - 375 (OFF) μs, 750 (ON) μs
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