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. 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
SGD159.93
Each
units
Barrel Retroreflective Maximum of 6.5 m NPN Cable - 30V - LED IP67 <25 mA - 600 μs ABS
RS Stock No. 493-7287
Mfr. Part No.WL18-3P430
BrandSick
SGD281.16
Each
units
Block Retroreflective 7 m PNP 4-Pin M12 Connector - 30V - LED IP65, IP67 100 mA - 500 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. 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. 360-0451
Mfr. Part No.WT24-2R210
BrandSick
SGD535.11
Each
units
- - - Relay - - - - LED IP69 - - <=10 ms Die Cast Zinc
RS Stock No. 714-1625
Mfr. Part No.ML100-55/95/103
SGD123.00
Each
units
Block Retroreflective 5 m PNP 4-Pin M8 Connector - 30V - LED IP67 100 mA - 0.5 ms PC
RS Stock No. 170-0724
Mfr. Part No.OPB704W-Z
BrandOptek
SGD5.475
Each (In a Bag of 100)
units
Block Retroreflective 3.8 mm NPN 4-Wire Cable 0.61m - - - Infrared - - - - Plastic
RS Stock No. 627-6556
Mfr. Part No.OPB704W-Z
BrandOptek
SGD6.43
Each
units
Block Retroreflective 3.8 mm NPN 4-Wire Cable 0.61m - - - Infrared - - - - Plastic
RS Stock No. 265-9222
Mfr. Part No.T18SP6LPQ
BrandBanner
SGD168.69
Each
units
Barrel Retroreflective 50 2000 mm PNP M12 Connector - 30V - LED IP69K 150 mA - - PBT, Plastic
RS Stock No. 301-606
Mfr. Part No.OPB706B
BrandOptek
SGD3.03
Each
units
Block Retroreflective 1.27 mm NPN - - - Wire Lead Infrared - - - - Plastic
RS Stock No. 431-1988
Mfr. Part No.EX24APN
BrandPanasonic
SGD163.85
Each
units
Block Retroreflective 2 25 mm PNP Cable - 24V - LED IP67 50 mA - <=0.5 ms PET
RS Stock No. 763-7895
Mfr. Part No.VTF18-4P1240
BrandSick
SGD146.94
Each
units
Barrel Background Suppression 3 100 mm PNP 4-Pin M12 Connector - 30V - Infrared IP67 100 mA - <=2 ms Nickel Plated Brass
RS Stock No. 372-8155
Mfr. Part No.E3ZD622M
BrandOmron
SGD140.92
Each
units
Block Diffuse 1 m NPN 3-Wire Cable 2m - 26.4V - Infrared IP69K 100 mA - 1 ms PBT
RS Stock No. 458-844
Mfr. Part No.WL12G-3B2531
BrandSick
SGD405.67
Each
units
Block Retroreflective 4 m NPN/PNP 5-Pin M12 Connector - 30V - LED IP69K 100 mA - <=330 μs Metal
RS Stock No. 786-5891
Mfr. Part No.VL180-2P42436
BrandSick
SGD116.40
Each
units
Barrel Retroreflective 0.05 7 m PNP 4-Pin M12 Connector - 30V - LED IP67 100 mA - 0.5 ms PBT, PC
RS Stock No. 714-1650
Mfr. Part No.ML100-8-H-350-RT/102/115
SGD176.00
Each
units
Block Diffuse 5 350 mm NPN Cable - 30V - LED IP67 100 mA - 1 ms PC
RS Stock No. 891-9514
Mfr. Part No.RLK31-8-2500-IR/31/115
SGD105.00
Each
units
Block Diffuse 0 2500 mm Relay 5-Wire Cable 2m 240V 240V - Infrared IP67 40 mA - 25 ms PC
RS Stock No. 784-0007
Mfr. Part No.MLV41-8-H-350-RT/59/92/136
SGD295.00
Each
units
Block Background Suppression 10 350 mm Push Pull 4-Pin M12 Connector - 30V - LED IP67 100 mA - 0.5 ms Aluminium
RS Stock No. 303-2173
Mfr. Part No.E3TFD112M
BrandOmron
SGD152.76
Each
units
Block Diffuse 5 30 mm NPN Pre-Wired Cable - 26.4V - LED IP67 50 mA - 1 ms PBT
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