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. 510-3148
Mfr. Part No.ML7-8-200/25/103/143
SGD223.00
Each
units
Block Diffuse 20 → 200 mm PNP 4-Pin M8 Connector - - 30V - LED IP69K 100 mA - 0.5 ms
RS Stock No. 847-9390
Mfr. Part No.QS18VP6LV
BrandBanner
SGD159.93
Each
units
Barrel Retroreflective Maximum of 6.5 m PNP Cable - - 30V - LED IP67 <25 mA - 600 μs
RS Stock No. 763-9377
Mfr. Part No.XUM8APCNL2
SGD158.56
Each
units
Block Background Suppression 300 mm PNP Cable - - 24V - LED IP67 100 mA - 1 ms
RS Stock No. 701-8809
Mfr. Part No.WSE4S-3E1330V
BrandSick
SGD379.00
Each
units
Block Through Beam (Emitter and Receiver) 5 m NPN Cable - - 30V - LED IP69K 100 mA - <=2.5 ms
RS Stock No. 909-2875
Mfr. Part No.Q3XTBLD150-Q8
BrandBanner
SGD489.62
Each
units
Barrel Diffuse 0 → 150 mm Bipolar NPN/PNP M12 Connector - - 30V M12 Laser Light IP67, IP68, IP69K <28 mA - 5 ms
RS Stock No. 297-5748
Mfr. Part No.RL39-8-2000/32/40A/82A/116
SGD351.00
Each
units
Block Diffuse 2000 mm PNP 4-Terminal Screw - - 30V - Infrared IP67 200 mA - <=1.5 ms
RS Stock No. 902-7142
Mfr. Part No.BOS 18M-PS-PR23-S4
BrandBALLUFF
SGD147.29
Each
units
Barrel Retroreflective Maximum of 4 m PNP M12 Connector - - 30V Connector LED IP67 - - -
RS Stock No. 133-6333
Mfr. Part No.XUK9TAH2MM12
SGD809.04
Each
units
Block Retroreflective 0.3 70 m Analogue M12 Connector - - 30V M12 Connector Laser Light IP67, IP69K 100 mA - 10 ms
RS Stock No. 463-8378
Mfr. Part No.RL39-54/32/40A/82A/116
SGD344.00
Each
units
Block Retroreflective 7 m PNP 4-Terminal Screw - - 30V - LED IP67 200 mA - <=1.5 ms
RS Stock No. 816-7552
Mfr. Part No.XUM5ANCNM8
SGD136.29
Each
units
Block Diffuse 1 m NPN 4-Pin M8 Connector - - 30V Screw LED IP67 200 mA - <1 ms
RS Stock No. 431-1770
Mfr. Part No.NX5RM7B
BrandPanasonic
SGD186.33
Each
units
Block Retroreflective 0.1 → 7 m Relay Cable 250V - 30V - Infrared IP66 - - <=10 ms
RS Stock No. 187-4867
Mfr. Part No.SLLN3002CL
BrandBulgin
SGD194.47
Each
units
- Diffuse Reflective 2 → 30 mm PNP Cable - - 24V Cable Red LED IP67 11 mA - <0.5 ms
RS Stock No. 176-9036
Mfr. Part No.O300.SL-GW1J.72N
BrandBaumer
SGD398.93
Each
units
Block Diffuse 250 mm - 4-Pin M8 Connector - - 30V Connector LED IP67 30 mA - <0.25 ms
RS Stock No. 909-2871
Mfr. Part No.Q3XTBLD100-Q8
BrandBanner
SGD383.91
Each
units
Barrel Diffuse 0 → 100 mm Bipolar NPN/PNP M12 Connector - - 30V M12 Laser Light IP67, IP68, IP69K <28 mA - 5 ms
RS Stock No. 187-1808
Mfr. Part No.O200.GR-GD1E.72NV/T007
BrandBaumer
SGD223.74
Each
units
Rectangular Background Suppression 7 → 80 mm Push Pull 4 Pin M8 Connector - - 30V M8 Connector - IP67 <50 (Output) mA - <1 ms
RS Stock No. 134-7785
Mfr. Part No.WSE4SC-3P2230A00
BrandSick
SGD228.55
Each
units
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. 2509667390
Mfr. Part No.VS1AP5CV20
SGD159.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 2509665675
Mfr. Part No.SM312CV
SGD195.13
Each
units
- - - - - - - - - - - - - -
RS Stock No. 2550074676
Mfr. Part No.SLM50B6
SGD258.16
Each
units
- - - - - - - - - - - - - -
RS Stock No. 2509665164
Mfr. Part No.OPBA2QD
SGD174.81
Each
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- - - - - - - - - - - - - -
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