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. 818-1611
Mfr. Part No.EE-SX674
BrandOmron
TWD739.00
Each
units
Fork Through Beam (Fork) Maximum of 5 mm NPN 4-Pin Connector - 24V Connector Infrared IP50 12 mA - - PBT
RS Stock No. 808-9171
Mfr. Part No.CX-422
BrandPanasonic
TWD3,069.00
Each
units
Block Diffuse 800 mm NPN 2m Cable - 24V - Infrared IP67 100 mA - 1 ms PBT
RS Stock No. 812-8153
Mfr. Part No.CX-441
BrandPanasonic
TWD3,804.00
Each
units
Block Retroreflective 2 → 50 mm NPN 2m Cable - 24V - LED IP67 20 mA - 1 ms PBT
RS Stock No. 194-4018
Mfr. Part No.OPB608A
BrandOptek
TWD52.00
Each
units
Block Retroreflective 1.27 → 9.525 mm NPN - - - Wire Lead Infrared - - - - Plastic
RS Stock No. 808-9199
Mfr. Part No.CX-442
BrandPanasonic
TWD3,792.00
Each
units
Block Diffuse 20 → 300 mm NPN 2m Cable - 24V - LED IP67 100 mA - 1 ms PBT
RS Stock No. 512-4656
Mfr. Part No.XUK9ARCNL2
TWD2,490.00
Each
units
Compact Retroreflective 5 m Relay 5-Wire Cable 2m 240V 240V - LED IP65 3 A - <25 ms PBT
RS Stock No. 807-4557
Mfr. Part No.EE-SV3
BrandOmron
TWD187.00
Each
units
Block Through Beam (Fork) - Phototransistor - 1.5V - PCB Pin - - 50 mA - 4 μs -
RS Stock No. 361-5510
Mfr. Part No.EX-13A-PN
BrandPanasonic
TWD3,316.00
Each
units
Block Through Beam (Emitter and Receiver) 500 mm PNP 3-Wire Cable 2m - 24V - LED IP67 50 mA - <=0.5 ms PET
RS Stock No. 902-7177
Mfr. Part No.BOS 21M-PA-RD10-S4
BrandBALLUFF
TWD6,024.00
Each
units
Block Diffuse 0.01 → 1 m PNP M12 Connector - 30V Connector LED IP67 100 mA - 1 ms Aluminium, GD-Zn
RS Stock No. 778-8707
Mfr. Part No.E3JK-DR11 2M
BrandOmron
TWD3,358.00
Each
units
Block Diffuse 2.5 m Relay 5-Wire Cable 2m 240V 240V Wire Lead LED IP64 - - 20 ms ABS
RS Stock No. 198-0553
Mfr. Part No.E3SGS3E4
BrandOmron
TWD7,208.00
Each
units
Fork Through Beam (Fork) 30 mm NPN Pre-Wired Cable - 24V - Infrared IP67 80 mA - 1 ms Metal
RS Stock No. 808-9121
Mfr. Part No.CX-411
BrandPanasonic
TWD3,058.00
Each
units
Block Through Beam (Emitter and Receiver) 10 m NPN 3-Wire Cable 2m - 24V - LED IP67 100 mA - 1 ms PBT
RS Stock No. 219-2331
Mfr. Part No.EE-SPX403N
BrandOmron
TWD1,589.00
Each
units
Fork Through Beam (Fork) 13 mm NPN Non-Solder Connector - 24V - Infrared IP50 80 mA - - PC
RS Stock No. 125-4567
Mfr. Part No.PM-Y65
BrandPanasonic
TWD596.00
Each
units
Fork Through Beam (Fork) 6 mm NPN 4-Pin Connector - 24V 4-Pin Connector Infrared IP40 50 (Sink Current) mA - 20 (Received) μs, 80 (Interrupted) μs PBT (Enclosure), Polycarbonate (Display Section)
RS Stock No. 425-8146
Mfr. Part No.OJ5026
TWD4,205.00
Each
units
Block Retroreflective 2 m PNP M8 Connector - 30V - LED IP67 200 mA - - ABS
RS Stock No. 361-5532
Mfr. Part No.EX-13EA-PN
BrandPanasonic
TWD3,316.00
Each
units
Block Through Beam (Emitter and Receiver) 500 mm PNP 3-Wire Cable 2m - 24V - LED IP67 50 mA - <=0.5 ms PET
RS Stock No. 810-2980
Mfr. Part No.NX5-D700A
BrandPanasonic
TWD2,891.00
Each
units
Block Diffuse 700 mm - Cable 240V 240V Cable Infrared IP66 1 A ac, 2 A dc - 10 ms PC
RS Stock No. 198-0480
Mfr. Part No.E3SCT61
BrandOmron
TWD11,703.00
Each
units
Block Through Beam (Emitter and Receiver) 30 m PNP Pre-Wired Cable - 30V - Infrared IP67 100 mA - 1 ms Die Cast Zinc
RS Stock No. 908-7087
Mfr. Part No.OPB700ALZ
BrandOptek
TWD294.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 818-1548
Mfr. Part No.E3JM-R4M4-US
BrandOmron
TWD4,629.00
Each
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Block Retroreflective Maximum of 4 m Relay 5-Terminal Screw 250V 5V - LED IP66 3 A - 30 ms ABS