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 Communication Protocol Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface Response Time
RS Stock No. 444-3574
Mfr. Part No.XUX0AKSAT16
PHP11,197.20
Each
units
Block Multimode 1.3 m, 2 m, 11 m, 40 m NPN/PNP 3-Terminal Screw - - 24V - Infrared IP65, IP67 100 mA - <2 ms
RS Stock No. 458-569
Mfr. Part No.E3ZMB86
BrandOmron
PHP10,272.08
Each
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Block Retroreflective 500 mm PNP 4-Pin M8 Connector - - 30V - LED IP69K 100 mA - 1 ms
RS Stock No. 219-2274
Mfr. Part No.EE-SX670
BrandOmron
PHP1,809.10
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Fork Through Beam (Fork) 5 mm NPN Connector - - 24V - Infrared IP50 100 mA - -
RS Stock No. 374-2016
Mfr. Part No.E3ZT812M
BrandOmron
PHP8,007.55
Each
units
Block Through Beam (Emitter and Receiver) 15 m PNP 4-Wire Cable 2m - - 26.4V - Infrared IP69K 100 mA - 1 ms
RS Stock No. 372-8155
Mfr. Part No.E3ZD622M
BrandOmron
PHP6,836.38
Each
units
Block Diffuse 1 m NPN 3-Wire Cable 2m - - 26.4V - Infrared IP69K 100 mA - 1 ms
RS Stock No. 219-2296
Mfr. Part No.EE-SX672
BrandOmron
PHP1,324.48
Each
units
Fork Through Beam (Fork) 5 mm NPN Connector - - 24V - Infrared IP50 100 mA - -
RS Stock No. 778-8700
Mfr. Part No.E3JK-DR12 2M
BrandOmron
PHP6,151.58
Each
units
Block Diffuse 300 mm Relay 5-Wire Cable 2m 240V - 240V Wire Lead LED IP64 - - 20 ms
RS Stock No. 306-2152
Mfr. Part No.E3TFD132M
BrandOmron
PHP7,295.51
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units
Block Diffuse 5 → 30 mm PNP 3-Wire Cable 2m - - 26.4V - LED IP67 50 mA - 1 ms
RS Stock No. 303-2173
Mfr. Part No.E3TFD112M
BrandOmron
PHP6,178.38
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Block Diffuse 5 → 30 mm NPN Pre-Wired Cable - - 26.4V - LED IP67 50 mA - 1 ms
RS Stock No. 458-828
Mfr. Part No.WL12-3P2431
BrandSick
PHP8,996.04
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Block Retro-Reflective 7 m PNP 4-Pin M12 Connector - - 30V - LED IP69K 100 mA - <=330 μs
RS Stock No. 822-4645
Mfr. Part No.E3Z-T61-L
BrandOmron
PHP5,389.73
Each
units
Block Through Beam (Emitter) 60 m NPN 2/3-Wire Cable 2m - - 24V - - IP67 35 mA - 1 ms
RS Stock No. 768-5954
Mfr. Part No.E3FALN122M
BrandOmron
PHP4,451.24
Each
units
Barrel Background Suppression 200 mm NPN Pre-Wired Cable - - 30V - LED IP67, IP69K 25 mA - 0.5 ms
RS Stock No. 372-8177
Mfr. Part No.E3ZR612M
BrandOmron
PHP5,886.98
Each
units
Block Retroreflective 100 mm → 4 m NPN 3-Wire Cable 2m - - 26.4V - LED IP69K 100 mA - 1 ms
RS Stock No. 303-2139
Mfr. Part No.E3TST122M
BrandOmron
PHP6,388.00
Each
units
Block Through Beam (Emitter and Receiver) 1 m NPN Pre-Wired Cable - - 26.4V - LED IP67 50 mA - 1 ms
RS Stock No. 778-8707
Mfr. Part No.E3JK-DR11 2M
BrandOmron
PHP6,151.58
Each
units
Block Diffuse 2.5 m Relay 5-Wire Cable 2m 240V - 240V Wire Lead LED IP64 - - 20 ms
RS Stock No. 775-4307
Mfr. Part No.E3FBLN122M
BrandOmron
PHP4,902.58
Each
units
Barrel Background Suppression 200 mm NPN Pre-Wired Cable - - 30V - LED IP67, IP69K 25 mA - 0.5 ms
RS Stock No. 617-0701
Mfr. Part No.E3ZM-R86
BrandOmron
PHP15,463.60
Each
units
Block Retroreflective 100 mm → 4 m PNP 4-Pin M8 Connector - - 30V - LED IP69K 100 mA - 1 ms
RS Stock No. 821-0056
Mfr. Part No.E3Z-T61-D 2M
BrandOmron
PHP6,837.94
Each
units
Block Through Beam (Receiver) 15 m NPN 2/3-Wire Cable 2m - - 24V Wire Lead Infrared IP67 20 mA - 1 ms
RS Stock No. 510-3249
Mfr. Part No.RLK29-55/59/116-SET
PHP7,509.51
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Block Retroreflective 12 m Relay 6-Terminal Screw 230V - 230V - LED IP67 2 A - 50 ms
RS Stock No. 686-2227
Mfr. Part No.XUM5APCNL2
PHP5,525.13
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Block Diffuse 1 m PNP Cable - - 24V - Infrared IP65, IP67 100 mA - 0.5 ms
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