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 Optical Technology Terminal Type Light Source IP Rating Maximum Current Interface
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 - -
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 - -
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 -
RS Stock No. 778-8700
Mfr. Part No.E3JK-DR12 2M
BrandOmron
kr 710,50
Each
Units
Block Diffuse 300 mm Relay 5-Wire Cable 2m 240V - 240V - Wire Lead LED IP64 - -
RS Stock No. 617-0644
Mfr. Part No.E3ZM-T86
BrandOmron
kr 2 214,00
Each
Units
Block Through Beam (Emitter and Receiver) 15 m PNP 4-Pin M8 Connector - - 30V - - Infrared IP69K 100 mA -
RS Stock No. 256-433
Mfr. Part No.E3JMR4M4G
BrandOmron
kr 1 645,00
Each
Units
Block Retroreflective 4 m Relay 5-Terminal Screw 250V - 5V - - LED IP66 3 A -
RS Stock No. 818-1548
Mfr. Part No.E3JM-R4M4-US
BrandOmron
kr 1 645,00
Each
Units
Block Retroreflective Maximum of 4 m Relay 5-Terminal Screw 250V - 5V - - LED IP66 3 A -
RS Stock No. 768-5923
Mfr. Part No.E3FA-DP12 2M
BrandOmron
kr 634,50
Each
Units
Barrel Diffuse 300 mm PNP 4-Wire Cable 2m - - 30V - - LED IP67, IP69K 25 mA -
RS Stock No. 768-5863
Mfr. Part No.E3FATP112M
BrandOmron
kr 895,50
Each
Units
Barrel Through Beam (Emitter and Receiver) 20 m PNP 4-Wire Cable 2m - - 30V - - LED IP67, IP69K 40 mA -
RS Stock No. 459-4919
Mfr. Part No.E3ZB86
BrandOmron
kr 1 659,00
Each
Units
Block Retroreflective 80 → 500 mm PNP M8 Connector - - 26.4V - - LED IP67 100 mA -
RS Stock No. 743-1329
Mfr. Part No.E3ZM-B86T
BrandOmron
kr 2 124,00
Each
Units
Block Retroreflective 100 500 mm PNP 4-Pin M8 Connector - - 30V - - LED IP67, IP69K 100 mA -
RS Stock No. 374-2038
Mfr. Part No.E3ZR812M
BrandOmron
kr 1 124,00
Each
Units
Block Retroreflective 100 mm → 4 m PNP 4-Pin M8 Connector 2m Cable - - 26.4V - - LED IP69K 100 mA -
RS Stock No. 743-1313
Mfr. Part No.E3Z-LS86
BrandOmron
kr 1 316,00
Each
Units
Block Background Suppression 20 → 200 mm PNP 4-Pin M8 Connector - - 26.4V - - LED IP67 100 mA -
RS Stock No. 778-8716
Mfr. Part No.E3JK-TR11 2M
BrandOmron
kr 919,00
Each
Units
Block Through Beam (Emitter and Receiver) 40 m Relay 5-Wire Cable 2m 240V - 240V - Wire Lead LED IP64 - -
RS Stock No. 201-8075
Mfr. Part No.E3SCL1
BrandOmron
kr 2 622,00
Each
Units
Block Background Suppression 5 200 mm NPN 3-Wire Cable 2m - - 30V - - LED IP67 100 mA -
RS Stock No. 775-4230
Mfr. Part No.E3FBRN22
BrandOmron
kr 655,98
Each
Units
Barrel Retroreflective 0 → 500 mm NPN 4-Pin M12 Connector - - 30V - - LED IP67, IP69K 25 mA -
RS Stock No. 816-0400
Mfr. Part No.E3FCTP21
BrandOmron
kr 1 167,00
Each
Units
Barrel Through Beam (Emitter and Receiver) 20 m PNP M12 Connector - - 30V - Cable LED IP67, IP68, IP69K 40 mA -
RS Stock No. 157-7078
Mfr. Part No.E3JMDS70M4TG
BrandOmron
kr 1 773,00
Each
Units
Block Diffuse 700 mm Relay 5-Terminal Screw 250V - 5V - - Infrared IP66 3 A -
RS Stock No. 775-4329
Mfr. Part No.E3FBVN21
BrandOmron
kr 727,26
Each
Units
Barrel Background Suppression 10 → 50 mm NPN 4-Pin M12 Connector - - 30V - - LED IP67, IP69K 25 mA -
RS Stock No. 157-7062
Mfr. Part No.E3JMR4M4TG
BrandOmron
kr 1 709,00
Each
Units
Block Retroreflective 4 m Relay 5-Terminal Screw 250V - 5V - - LED IP66 3 A -