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. 297-5754
Mfr. Part No.RLK39-8-2000/31/40A/116
SGD297.44
Each
units
Block Diffuse 2000 mm Relay 4-Terminal Screw 240V 240V - Infrared LED IP67 3 A - <=20 ms PBT
RS Stock No. 615-8256
Mfr. Part No.E3Z-LT81 2M
BrandOmron
SGD231.61
Each
units
Block Through Beam (Emitter and Receiver) 60 m PNP 3-Wire Cable 2m - 26.4V - LED IP67 100 mA - 1 ms PBT
RS Stock No. 256-449
Mfr. Part No.E3JMDS70M4G
BrandOmron
SGD216.36
Each
units
Block Diffuse 700 mm Relay 5-Terminal Screw 250V 5V - Infrared IP66 3 A - 30 ms ABS
RS Stock No. 405-7404
Mfr. Part No.QS18VP6DQ
BrandBanner
SGD145.49
Each
units
Block Diffuse 450 mm PNP Cable - 30V - LED IP67 100 mA - 600 ms ABS, Plastic
RS Stock No. 405-7397
Mfr. Part No.QS18VP6DQ
BrandBanner
SGD148.54
Each
units
Block Diffuse 450 mm PNP Cable - 30V - LED IP67 100 mA - 600 ms ABS, Plastic
RS Stock No. 814-0355
Mfr. Part No.O6H303
SGD196.53
Each
units
Block Diffuse 2 → 200 mm PNP 4-Pin M8 Connector - 30V Cable LED IP65, IP67, IP68, IP69 22 mA - - Stainless Steel
RS Stock No. 617-0694
Mfr. Part No.E3Z-LL86
BrandOmron
SGD269.68
Each
units
Block Background Suppression 20 → 300 mm PNP M8 Connector - 26.4V - LED IP67 100 mA - 1 ms PBT
RS Stock No. 371-4673
Mfr. Part No.VTF18-3F1840
BrandSick
SGD114.00
Each
units
Barrel Diffuse 100 mm PNP 4-Pin M12 Connector - 30V - Infrared IP67 100 mA - <=2 ms PBT, PC
RS Stock No. 157-7078
Mfr. Part No.E3JMDS70M4TG
BrandOmron
SGD249.62
Each
units
Block Diffuse 700 mm Relay 5-Terminal Screw 250V 5V - Infrared IP66 3 A - 30 ms ABS
RS Stock No. 842-2906
Mfr. Part No.Q12AB6FF50Q
BrandBanner
SGD153.28
Each
units
Block Diffuse Maximum of 50 mm NPN/PNP Cable - 30V - LED IP67 20 mA - 700 μs Thermoplastic Elastomer
RS Stock No. 219-2296
Mfr. Part No.EE-SX672
BrandOmron
SGD35.57
Each
units
Fork Through Beam (Fork) 5 mm NPN Connector - 24V - Infrared IP50 100 mA - - PBT
RS Stock No. 219-2410
Mfr. Part No.EE-SY672
BrandOmron
SGD36.29
Each
units
Block Retroreflective 1 → 5 mm NPN - - 24V - Infrared IP50 100 mA - - PBT
RS Stock No. 818-1520
Mfr. Part No.EE-SPY411
BrandOmron
SGD69.40
Each
units
Block Convergent 2 → 5 mm NPN - - 24V Connector Infrared IP50 50 mA - - PC
RS Stock No. 695-6980
Mfr. Part No.XUVR0608PBNM8
SGD130.77
Each
units
Fork Through Beam 80 mm PNP 3-Pin M8 Connector - 24V - LED IP65, IP67 100 mA - - Polyamide
RS Stock No. 124-0334
Mfr. Part No.OBT300-R101-2EP-IO-V31-L
SGD218.00
Each
units
Block Background Suppression 7 → 300 mm NPN/PNP 4-Pin M8 Connector - 30V 4-Pin Connector Laser Light IP67, IP69, IP69K 100 mA IO-Link 300 μs PC
RS Stock No. 431-5643
Mfr. Part No.EX11EBPN
BrandPanasonic
SGD152.32
Each
units
Block Through Beam (Emitter and Receiver) 150 mm PNP Cable - 24V - LED IP67 50 mA - <=0.5 ms PET
RS Stock No. 808-9367
Mfr. Part No.CX-412A-C05
BrandPanasonic
SGD93.44
Each
units
Block Through Beam (Emitter and Receiver) 15 m NPN 2m Cable - 24V - Infrared IP67 100 mA - 1 ms PBT
RS Stock No. 847-9233
Mfr. Part No.QS18VN6LV
BrandBanner
SGD132.58
Each
units
Barrel Retroreflective Maximum of 6.5 m NPN Cable - 30V - LED IP67 <25 mA - 600 μs ABS
RS Stock No. 686-2227
Mfr. Part No.XUM5APCNL2
SGD138.96
Each
units
Block Diffuse 1 m PNP Cable - 24V - Infrared IP65, IP67 100 mA - 0.5 ms PBT
RS Stock No. 493-7287
Mfr. Part No.WL18-3P430
BrandSick
SGD275.00
Each
units
Block Retroreflective 7 m PNP 4-Pin M12 Connector - 30V - LED IP65, IP67 100 mA - 500 μs ABS
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