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. 218-967
Mfr. Part No.WT100L-F1141
BrandSick
TWD6,600.00
Each
units
Block Diffuse 450 mm PNP 3-Wire Cable 2m - 30V - Laser Light IP65 100 mA - <0.25 ms ABS, PMMA
RS Stock No. 184-6328
Mfr. Part No.1094791
BrandSick
TWD2,627.00
Each
units
Barrel Diffuse 3 → 250 mm NPN M12-4 Pin Connector - 30V M12 LED IP67 30 mA - <1000 μs ABS, Brass, Metal
RS Stock No. 808-9363
Mfr. Part No.CX-411B-C05
BrandPanasonic
TWD2,454.00
Each
units
Block Through Beam (Emitter and Receiver) 10 m NPN 2m Cable - 24V - LED IP67 100 mA - 1 ms PBT
New
RS Stock No. 191-5204
Mfr. Part No.VS8APFF15
BrandBanner
TWD6,680.00
Each
units
- - 2 → 15 mm PNP 4-Wire Cable 2m - 30V Cable Red LED IP67 <20 mA - 500 μs Glass-Fiber Reinforced Plastic
RS Stock No. 902-6969
Mfr. Part No.BOS Q08M-X-LS20-S49
BrandBALLUFF
TWD3,680.00
Each
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Barrel Through Beam (Emitter) 0 → 3 m - 3-Pin M8 Connector - 30V Connector LED IP67 100 mA - 1.25 ms Nickel Plated GD-Zn
RS Stock No. 768-5926
Mfr. Part No.E3FADP22
BrandOmron
TWD2,156.00
Each
units
Barrel Diffuse 300 mm PNP 4-Pin M12 Connector - 30V - LED IP67, IP69K 25 mA - 0.5 ms ABS
RS Stock No. 185-2212
Mfr. Part No.FHDM 16P5001/S14
BrandBaumer
TWD8,040.00
Each
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Block Diffuse 20 → 450 mm PNP 4-Pin M12 Connector - 30V - LED IP67 200 mA - <1 ms Die Cast Zinc
RS Stock No. 180-6368
Mfr. Part No.WSE9M4-3P1130
BrandSick
TWD6,952.00
Each
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Block Through Beam 0 → 10 m PNP 4-Wire Cable - 30V Cable LED IP66, IP67, IP69K 100 mA - <0.5 ms Plastic, Vistal
RS Stock No. 752-5060
Mfr. Part No.XUB2AKSNM12T
TWD1,090.00
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Barrel Through Beam (Emitter) 15 m Solid State 4-Pin M12 Connector - 24V - Infrared IP65, IP67 100 mA - <1 ms PBT
RS Stock No. 176-9849
Mfr. Part No.QS18VN6CV45Q8
BrandBanner
TWD4,097.00
Each
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Block Diffuse 43 mm NPN M12 Connector - 30V Connector LED IP67 - - 0.6 ms Thermoplastic
RS Stock No. 860-1367
Mfr. Part No.S18SP6LQ
BrandBanner
TWD1,929.00
Each
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Barrel Retroreflective Maximum of 2 m PNP 4-Pin Connector - 30V - LED IP69K 30 mA - 3 (OFF) ms, 3 (ON) ms PBT Polyester
RS Stock No. 442-0408
Mfr. Part No.WT160-F420
BrandSick
TWD5,600.00
Each
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Block Diffuse 4 → 60 mm PNP 4-Pin M8 Connector - 30V - LED IP69K 100 mA - <=0.5 ms PBT, PMMA
New
RS Stock No. 190-4214
Mfr. Part No.T18-2VPFF30-Q8
BrandBanner
TWD6,004.00
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Barrel Background Suppression (Fixed) 30 mm PNP 4 Pin M12 Connector - 30V 4 Pin M12 Connector Infrared IP67, IP68, IP69K <25 mA - 2 (OFF) ms, 2 (ON) ms PBT Polyester
New
RS Stock No. 188-5205
Mfr. Part No.PD30ETT15M5
TWD2,867.00
Each
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Miniature Through-Beam 15 m - M8 x 4 Pin Connector - 30V M8 - IP68, IP69K 20 mA, 25 mA - 1 (On-Off) ms AISI316L, Stainless Steel
RS Stock No. 807-4551
Mfr. Part No.EE-SX1103
BrandOmron
TWD38.00
Each
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Block Diffuse - - - 1.6V - PCB Pin - - 50 mA - 10 μs -
RS Stock No. 530-0939
Mfr. Part No.WTB4-3P2161
BrandSick
TWD6,300.00
Each
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Block Diffuse 4 → 150 mm PNP 3-Pin M8 Connector - 30V - LED IP66, IP67 100 mA - <0.5 ms Bayblend, PMMA
RS Stock No. 903-3933
BrandRS PRO
TWD2,027.00
Each
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Fork Through Beam (Fork) 30 mm PNP 4-Wire Cable 2m - 30V Pre-Wired Infrared IP67 15 mA - 1 ms Aluminium Alloy
RS Stock No. 743-1329
Mfr. Part No.E3ZM-B86T
BrandOmron
TWD5,898.00
Each
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Block Retroreflective 100 → 500 mm PNP 4-Pin M8 Connector - 30V - LED IP67, IP69K 100 mA - 1 ms Stainless Steel
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TWD5,721.00
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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. 841-1732
Mfr. Part No.E3SLS20XB4
BrandOmron
TWD12,537.00
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Barrel Diffuse 50 → 250 mm PNP Pre-Wired - 24V - Infrared IP67 100 mA - 1 ms Die Cast Zinc