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. 493-7322
Mfr. Part No.WF15-40B410
BrandSick
MYR811.28
Each
units
Fork Through Beam (Fork) 15 mm NPN/PNP 4-Pin M8 Connector - 30V - Infrared IP65 100 mA - 100 μs Aluminium
RS Stock No. 121-2722
Mfr. Part No.WTB11-2P2461
BrandSick
MYR651.45
Each
units
Block Background Suppression 30 → 1100 mm PNP 4-Pin M12 Connector - 30V M12 LED IP66, IP67, IP69K 30 mA - 2.5 ms ABS Plastic
RS Stock No. 808-9130
Mfr. Part No.CX-412
BrandPanasonic
MYR445.67
Each
units
Block Through Beam (Emitter and Receiver) 15 m NPN 2m Cable - 24V - Infrared IP67 100 mA - 1 ms PBT
RS Stock No. 815-4170
Mfr. Part No.O300.GR-11110414
BrandBaumer
MYR621.01
Each
units
Block Diffuse 30 → 300 mm Push Pull 4-Pin M8 Connector - 30V Cable LED IP67 45 mA - <1 ms ASA, PMMA
RS Stock No. 374-2050
Mfr. Part No.E3ZD812M
BrandOmron
MYR506.33
Each
units
Block Diffuse 5 → 100 mm PNP 3-Wire Cable 2m - 26.4V - Infrared IP69K 100 mA - 1 ms PBT
RS Stock No. 877-7408
Mfr. Part No.HG-C1100
BrandPanasonic
MYR2,378.32
Each
units
Block Background Suppression 100 mm NPN Cable - 24V - Laser Light IP67 - - 1.5 (High Speed) ms, 5 (Standard) ms, 10 (High Precision) ms Acrylic (Front cover), Aluminum Die Cast
RS Stock No. 219-2397
Mfr. Part No.EE-SPY402 JPN
BrandOmron
MYR226.28
Each
units
Block Retroreflective 5 mm NPN Non-Solder Connector - 24V - Infrared IP50 80 mA - - PC
RS Stock No. 157-7062
Mfr. Part No.E3JMR4M4TG
BrandOmron
MYR821.38
Each
units
Block Retroreflective 4 m Relay 5-Terminal Screw 250V 5V - LED IP66 3 A - 30 ms ABS
RS Stock No. 818-1716
Mfr. Part No.EE-SX675
BrandOmron
MYR110.63
Each
units
Fork Through Beam (Fork) Maximum of 5 mm NPN 4-Pin Connector - 24V Connector Infrared IP50 12 mA - - PBT
RS Stock No. 818-1738
Mfr. Part No.EE-SX672-WR 1M
BrandOmron
MYR130.86
Each
units
Fork Through Beam (Fork) Maximum of 5 mm NPN - - 24V Pre-Wired Infrared IP50 35 mA - - PBT
RS Stock No. 303-2195
Mfr. Part No.E3TSL212M
BrandOmron
MYR559.12
Each
units
Block Retroreflective 5 → 30 mm NPN Pre-Wired Cable - 26.4V - LED IP67 50 mA - 1 ms PBT
RS Stock No. 488-132
Mfr. Part No.O5P200
MYR576.43
Each
units
Block Retroreflective 0.1 → 7 m PNP M12 Connector - 36V - LED IP67 200 mA - - Polyamide
RS Stock No. 493-7259
Mfr. Part No.WT18-3P430
BrandSick
MYR1,291.69
Each
units
Block Diffuse 50 → 600 mm PNP 4-Pin M12 Connector - 30V - LED IP67 100 mA - <700 μs ABS
RS Stock No. 784-6692
Mfr. Part No.DT50-P1123
BrandSick
MYR2,064.79
Each
units
Block Background Suppression 200 → 10000 mm Analogue 5-Pin M12 Connector - 30V - Laser Light IP65 100 mA - 20 ms, 30 ms Die Cast Zinc, PMMA
RS Stock No. 847-9426
Mfr. Part No.QS18VP6RQ8
BrandBanner
MYR405.70
Each
units
Barrel Through Beam (Receiver) 20 m PNP 4-Pin Connector - 30V - LED IP67 <25 mA - 375 (OFF) μs, 750 (ON) μs ABS
RS Stock No. 815-4174
Mfr. Part No.O300.GP-11110415
BrandBaumer
MYR702.10
Each
units
Block Diffuse 30 → 200 mm Push Pull 4-Pin M8 Connector - 30V Cable LED IP67 45 mA - <0.49 ms ASA, PMMA
RS Stock No. 265-9272
Mfr. Part No.T18SP6FF100Q
BrandBanner
MYR884.26
Each
units
Barrel Diffuse 100 mm PNP M12 Connector - 30V - LED IP69K 150 mA - - PBT, Plastic
RS Stock No. 530-0866
Mfr. Part No.WTB27-3P2411
BrandSick
MYR1,256.69
Each
units
Block Diffuse 30 → 1600 mm PNP 4-Pin M12 Connector - 30V - Infrared IP69K 100 mA - <=1.5 ms ABS
RS Stock No. 847-9075
Mfr. Part No.QS186EQ8
BrandBanner
MYR232.72
Each
units
Barrel Through Beam (Emitter) 20 m - 4-Pin M12 Connector - 30V - LED IP67 <25 mA - 375 (OFF) μs, 750 (ON) μs ABS
RS Stock No. 617-0650
Mfr. Part No.E3Z-LR81 2M
BrandOmron
MYR666.82
Each
units
Block Retroreflective 0.2 → 7 m PNP 3-Wire Cable 2m - 26.4V - LED IP67 100 mA - 1 ms PBT
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