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 Terminal Type Light Source IP Rating Maximum Current Interface Response Time
RS Stock No. 403-963
Mfr. Part No.GLV18-6-S/59/102/115
TWD1,967.00
Each
units
Barrel Retroreflective 5.5 m NPN Cable - - 30V - LED IP67 100 mA - <=1 ms
RS Stock No. 729-5117
BrandRS PRO
TWD2,668.00
Each
units
Barrel Retro-Reflective 0.05 → 7 m PNP Cable - - 30V - LED IP67 100 mA - <=0.5 ms
RS Stock No. 909-2869
Mfr. Part No.Q3XTBLD-Q8
BrandBanner
TWD8,797.00
Each
units
Barrel Diffuse 0 → 300 mm Bipolar NPN/PNP M12 Connector - - 30V M12 Laser Light IP67, IP68, IP69K <28 mA - 5 ms
RS Stock No. 714-1666
Mfr. Part No.M100/MV100-RT/76a/103/115
TWD4,083.00
Each
units
Block Through Beam (Emitter and Receiver) 10 m PNP Cable - - 30V - LED IP67 100 mA - 0.5 ms
RS Stock No. 125-4543
Mfr. Part No.PM-L45
BrandPanasonic
TWD685.00
Each
units
Fork Through Beam (Fork) 6 mm NPN 1m Cable - - 24V Cable Infrared IP64 50 (Sink Current) mA - 20 (Received) μs, 80 (Interrupted) μs
RS Stock No. 609-0813
Mfr. Part No.XUX1ARCNT16
TWD5,115.00
Each
units
Block Retroreflective 14 m Relay 5-Terminal Screw 240V - 240V - Infrared IP65, IP67 3 A, 500 mA - <25 ms
RS Stock No. 124-0334
Mfr. Part No.OBT300-R101-2EP-IO-V31-L
TWD5,019.00
Each
units
Block Background Suppression 7 → 300 mm NPN/PNP 4-Pin M8 Connector - IO-LINK 30V 4-Pin Connector Laser Light IP67, IP69, IP69K 100 mA IO-Link 300 μs
RS Stock No. 818-1621
Mfr. Part No.EE-SX672P
BrandOmron
TWD776.00
Each
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Fork Through Beam (Fork) Maximum of 5 mm PNP 4-Pin Connector - - 24V Connector Infrared IP50 12 mA - -
RS Stock No. 493-7287
Mfr. Part No.WL18-3P430
BrandSick
TWD6,377.00
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Block Retroreflective 7 m PNP 4-Pin M12 Connector - - 30V - LED IP65, IP67 100 mA - 500 μs
RS Stock No. 818-0299
Mfr. Part No.DS35-B15821
BrandSick
TWD15,293.00
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Block Background Suppression 50 → 3100 mm NPN/PNP 5-Pin M12 Connector - IO-LINK 30V M12 Connector Laser Light IP65, IP67 - IO-Link 2.5 ms, 6.5 ms, 12.5 ms, 24.5 ms, 96.5 ms
RS Stock No. 289-0158
Mfr. Part No.VT18-2T1410
BrandSick
TWD4,900.00
Each
units
Barrel Diffuse 2 100 mm Triac 4-Pin M12 Connector 253V - - - Infrared IP67 300 mA - <=20 ms
RS Stock No. 812-8395
Mfr. Part No.PM2-LH10-C1
BrandPanasonic
TWD2,963.00
Each
units
Block Diffuse 2.5 → 8 mm NPN Cable - - 24V Wire Lead LED - 80 mA - 0.8 ms
RS Stock No. 818-1576
Mfr. Part No.EE-SX670P
BrandOmron
TWD996.00
Each
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Fork Through Beam (Fork) Maximum of 5 mm PNP 4-Pin Connector - - 24V Connector Infrared IP50 12 mA - -
RS Stock No. 530-0917
Mfr. Part No.WTB27-3S1511
BrandSick
TWD11,700.00
Each
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Block Diffuse 30 → 1600 mm Relay 4-Wire Cable 2m 250V - 24V - Infrared IP66, IP67 3 A ac, 32 A dc - <=10 ms
RS Stock No. 121-2721
Mfr. Part No.WTB27-3P2461
BrandSick
TWD10,200.00
Each
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Block Background Suppression 30 2000 mm PNP 4-Pin M12 Connector - - 30V M12 LED IP69K 35 mA - 1.5 ms
RS Stock No. 530-0923
Mfr. Part No.WTB27-3P1111
BrandSick
TWD12,000.00
Each
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Block Diffuse 30 → 1600 mm PNP 4-Wire Cable 2m - - 30V - Infrared IP66, IP67 100 mA - <=1.5 ms
RS Stock No. 753-0331
Mfr. Part No.XUK1ANANL2
TWD3,238.00
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Compact Retroreflective 7 m NPN Cable - - 24V - Infrared IP65 100 mA - <2 ms
RS Stock No. 842-3206
Mfr. Part No.Q45BB6LPQ5
BrandBanner
TWD5,125.00
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Block Retroreflective 0.15 → 6 m NPN/PNP 4-Pin M12 Connector - - 30V - LED IP67 50 mA - 2 ms
RS Stock No. 134-7785
Mfr. Part No.WSE4SC-3P2230A00
BrandSick
TWD6,100.00
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Block Through Beam (Emitter and Receiver) 0 → 5 m PNP 4-Pin M8 Connector - IO-LINK 30V 4-Pin Connector LED IP66, IP67 20 mA IO-Link 450 μs
RS Stock No. 770-7017
Mfr. Part No.WSE250-2P1131
BrandSick
TWD6,302.00
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Block Through Beam (Emitter and Receiver) 50 m PNP 2/4-Wire Cable 2m - - 30V - LED IP67 100 mA - <=0.05 ms