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. 219-2331
Mfr. Part No.EE-SPX403N
BrandOmron
MYR228.44
Each
units
Fork Through Beam (Fork) 13 mm NPN Non-Solder Connector - 24V - Infrared IP50 80 mA - - PC
RS Stock No. 818-1624
Mfr. Part No.EE-SX471
BrandOmron
MYR108.23
Each
units
Fork Through Beam (Fork) Maximum of 5 mm NPN - - 24V Connector Infrared IP50 12 mA - - PBT
RS Stock No. 814-0345
Mfr. Part No.OGH500
MYR637.23
Each
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Barrel Diffuse 15 → 300 mm PNP M12 Connector - 36V Wire Lead LED IP67 25 mA - - Stainless Steel
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. 847-9384
Mfr. Part No.QS18VP6LPQ8
BrandBanner
MYR393.99
Each
units
Barrel Retroreflective Maximum of 3.5 m PNP 4-Pin M12 Connector - 30V - LED IP67 <25 mA - 600 μs ABS
RS Stock No. 818-1589
Mfr. Part No.E32-T61-S
BrandOmron
MYR2,046.32
Each
units
Barrel Through Beam (Emitter and Receiver) - - - - - - - IP67 - - - Glass
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. 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. 784-6692
Mfr. Part No.DT50-P1123
BrandSick
MYR2,064.79
Each
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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. 714-1622
Mfr. Part No.ML100-55/103/115
MYR415.40
Each
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Block Retroreflective 5 m PNP 3-Wire Cable 2m - 30V - LED IP67 100 mA - 0.5 ms PC
RS Stock No. 542-5145
Mfr. Part No.FPDK 20P 5101 S35A
BrandBaumer
MYR571.28
Each
units
Block Retroreflective 4.5 m PNP 4-Pin M8 Connector - 30V - LED IP67 100 mA - <0.5 ms ABS, PBT
RS Stock No. 901-2780
Mfr. Part No.CX-422-P-J
BrandPanasonic
MYR464.13
Each
units
Block Diffuse Maximum of 800 mm PNP M12 Connector - 24V - Infrared IP67 - - 1 ms PBT
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. 818-4103
Mfr. Part No.E3Z-T61 2M
BrandOmron
MYR663.85
Each
units
Block Through Beam (Emitter and Receiver) Maximum of 15 mm NPN Cable - 26.4V Pre-Wired LED IP67 100 mA - 1 ms Polybutylene Terephthalate
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. 444-3417
Mfr. Part No.XUB0AKSNL2T
MYR310.22
Each
units
Barrel Through Beam (Emitter) 15 m - 3-Wire Cable 2m - 24V - Infrared IP65, IP67 100 mA - <2 ms 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. 842-3350
Mfr. Part No.Q60VR3AF2000
BrandBanner
MYR1,548.02
Each
units
Block Diffuse 200 → 2000 mm Relay Cable 250V 250V - LED IP67 50 mA - 15 ms ABS Polycarbonate
RS Stock No. 326-7240
Mfr. Part No.E3TSL132M
BrandOmron
MYR557.14
Each
units
Block Retroreflective 5 → 15 mm PNP Pre-Wired Cable - 26.4V - LED IP67 50 mA - 1 ms PBT
RS Stock No. 493-7322
Mfr. Part No.WF15-40B410
BrandSick
MYR811.28
Each
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Fork Through Beam (Fork) 15 mm NPN/PNP 4-Pin M8 Connector - 30V - Infrared IP65 100 mA - 100 μs Aluminium
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