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. 361-5554
Mfr. Part No.EX-14A-PN
BrandPanasonic
MYR370.50
Each
units
Block Retroreflective 2 → 25 mm PNP 3-Wire Cable 2m - 24V - LED IP67 50 mA - <=0.5 ms PET
RS Stock No. 360-0451
Mfr. Part No.WT24-2R210
BrandSick
MYR1,390.32
Each
units
- - - Relay - - - - LED IP69 - - <=10 ms Die Cast Zinc
RS Stock No. 458-844
Mfr. Part No.WL12G-3B2531
BrandSick
MYR1,215.33
Each
units
Block Retroreflective 4 m NPN/PNP 5-Pin M12 Connector - 30V - LED IP69K 100 mA - <=330 μs Metal
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. 822-4522
Mfr. Part No.E32-T11L
BrandOmron
MYR473.61
Each
units
Barrel Through Beam (Emitter and Receiver) 250 mm - Screw Clamp - - - - IP67 - - - Brass Nickel Plating (Sensing Head)
RS Stock No. 786-5908
Mfr. Part No.WL11G-2B2531
BrandSick
MYR754.02
Each
units
Block Retroreflective 0 → 4 m NPN/PNP 5-Pin M12 Connector - 30V - LED IP66, IP67, IP69K 100 mA - 330 μs ABS, Plastic
RS Stock No. 818-1611
Mfr. Part No.EE-SX674
BrandOmron
MYR98.53
Each
units
Fork Through Beam (Fork) Maximum of 5 mm NPN 4-Pin Connector - 24V Connector Infrared IP50 12 mA - - PBT
RS Stock No. 627-8388
Mfr. Part No.OPB715-Z
BrandOptek
MYR40.55
Each
units
Block Retroreflective 12.7 mm - - - 5.25V Wire Lead LED - - - - Plastic
RS Stock No. 170-0725
Mfr. Part No.OPB715-Z
BrandOptek
MYR46.87
Each (In a Bag of 25)
units
Block Retroreflective 12.7 mm - - - 5.25V Wire Lead LED - - - - Plastic
RS Stock No. 778-8700
Mfr. Part No.E3JK-DR12 2M
BrandOmron
MYR458.74
Each
units
Block Diffuse 300 mm Relay 5-Wire Cable 2m 240V 240V Wire Lead LED IP64 - - 20 ms ABS
RS Stock No. 219-2404
Mfr. Part No.EE-SY671
BrandOmron
MYR108.13
Each
units
Block Retroreflective 1 → 5 mm NPN Non-Solder Connector - 24V - Infrared IP50 100 mA - - PBT
RS Stock No. 778-8707
Mfr. Part No.E3JK-DR11 2M
BrandOmron
MYR510.10
Each
units
Block Diffuse 2.5 m Relay 5-Wire Cable 2m 240V 240V Wire Lead LED IP64 - - 20 ms ABS
RS Stock No. 303-2139
Mfr. Part No.E3TST122M
BrandOmron
MYR797.85
Each
units
Block Through Beam (Emitter and Receiver) 1 m NPN Pre-Wired Cable - 26.4V - LED IP67 50 mA - 1 ms PBT
RS Stock No. 418-4922
Mfr. Part No.BGL 120A-001-S49
BrandBALLUFF
MYR1,010.44
Each
units
Fork Through Beam (Fork) 120 mm PNP 3-Pin M8 Connector - 30V - LED IP67 200 mA - - Anodised Aluminium
RS Stock No. 447-131
Mfr. Part No.GL80-RT/32/40A/98A
MYR1,066.75
Each
units
Fork Through Beam (Fork) 80 mm PNP 3-Pin M8 Connector - 30V - LED IP67 200 mA - 1 ms Aluminium
RS Stock No. 530-0945
Mfr. Part No.WTB4-3N2161
BrandSick
MYR757.20
Each
units
Block Diffuse 4 → 150 mm NPN 3-Pin M8 Connector - 30V - LED IP66, IP67 100 mA - <0.5 ms Bayblend, PMMA
RS Stock No. 818-1621
Mfr. Part No.EE-SX672P
BrandOmron
MYR110.63
Each
units
Fork Through Beam (Fork) Maximum of 5 mm PNP 4-Pin Connector - 24V Connector Infrared IP50 12 mA - - PBT
RS Stock No. 808-9171
Mfr. Part No.CX-422
BrandPanasonic
MYR407.79
Each
units
Block Diffuse 800 mm NPN 2m Cable - 24V - Infrared IP67 100 mA - 1 ms PBT
RS Stock No. 219-2375
Mfr. Part No.EE-SPY401 JPN
BrandOmron
MYR205.43
Each
units
Block Retroreflective 5 mm NPN Non-Solder Connector - 24V - Infrared IP50 80 mA - - PC
RS Stock No. 372-8155
Mfr. Part No.E3ZD622M
BrandOmron
MYR608.06
Each
units
Block Diffuse 1 m NPN 3-Wire Cable 2m - 26.4V - Infrared IP69K 100 mA - 1 ms PBT
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