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 Optical Technology Terminal Type Light Source IP Rating Maximum Current Interface
RS Stock No. 418-5278
Mfr. Part No.BGL 50 A-001-S49
BrandBALLUFF
kr 1 524,69
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Fork Through Beam (Fork) 50 mm PNP 3-Pin M8 Connector - - 30V - - LED IP67 200 mA -
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Mfr. Part No.BOS 18M-PS-RD23-S4
BrandBALLUFF
kr 886,50
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Barrel Diffuse Maximum of 400 mm PNP M12 Connector - - 30V - Connector LED IP67 - -
RS Stock No. 418-5234
Mfr. Part No.BGL 10 A-001-S49
BrandBALLUFF
kr 1 144,17
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Fork Through Beam (Fork) 10 mm PNP - - - 30V - - LED IP67 200 mA -
RS Stock No. 902-7142
Mfr. Part No.BOS 18M-PS-PR23-S4
BrandBALLUFF
kr 927,17
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Barrel Retroreflective Maximum of 4 m PNP M12 Connector - - 30V - Connector LED IP67 - -
RS Stock No. 902-7124
Mfr. Part No.BOS 12M-PS-PR10-02
BrandBALLUFF
kr 805,25
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Barrel Retroreflective Maximum of 3000 mm PNP Cable - - 30V - Cable LED IP67 100 mA -
RS Stock No. 418-5256
Mfr. Part No.BGL 20 A-001-S49
BrandBALLUFF
kr 1 253,18
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Fork Through Beam (Fork) 20 mm PNP - - - 30V - - LED IP67 200 mA -
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Mfr. Part No.BGL 120A-001-S49
BrandBALLUFF
kr 1 798,02
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Fork Through Beam (Fork) 120 mm PNP 3-Pin M8 Connector - - 30V - - LED IP67 200 mA -
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Mfr. Part No.BOS 6K-PU-RH10-S75
BrandBALLUFF
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Block Diffuse 1 → 200 mm PNP 5 Pin M8 Connector - - 30V - Cable LED IP67 / IP69K 100 mA -
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Mfr. Part No.BOS 23K-GI-RD10-S4
BrandBALLUFF
kr 964,08
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Block Diffuse 0 → 2000 mm NPN/PNP 4-Pin M12 Connector - IO-LINK 30V - 4-Pin Connector LED IP6X, IPX6K 100 mA IO-Link
RS Stock No. 902-6969
Mfr. Part No.BOS Q08M-X-LS20-S49
BrandBALLUFF
kr 1 075,94
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Barrel Through Beam (Emitter) 0 → 3 m - 3-Pin M8 Connector - - 30V - Connector LED IP67 100 mA -
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Mfr. Part No.BOS 21M-PA-ID10-S4
BrandBALLUFF
kr 1 773,00
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Block Diffuse 0.05 → 2 m PNP M12 Connector - - 30V - Connector LED IP67 100 mA -
RS Stock No. 814-1092
Mfr. Part No.BOS 5K-PS-RR10-S75
BrandBALLUFF
kr 753,19
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Block Retroreflective 0 4 mm PNP 4-Pin M8 Connector - - 30V - Cable LED IP67 100 mA -
RS Stock No. 135-0286
Mfr. Part No.BOS 18M-PI-RD30-S4
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kr 1 240,47
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Barrel Diffuse 1 → 500 mm PNP 4-Pin M12 Connector - IO-LINK 30V - 4-Pin Connector LED IP67 40 mA IO-Link
RS Stock No. 902-7076
Mfr. Part No.BOS 6K-PU-PR10-S75
BrandBALLUFF
kr 1 353,44
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Block Retroreflective Maximum of 10 m PNP 4-Pin M8 Connector - - 30V - Connector LED IP67, IP69K 100 mA -
RS Stock No. 902-7004
Mfr. Part No.BOS R020K-PS-RX11-02
BrandBALLUFF
kr 1 353,44
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Block Through Beam (Emitter and Receiver) 0 → 2000 mm PNP Cable - - - - Cable LED IP67 - -
RS Stock No. 902-7206
Mfr. Part No.BOS 26K-PA-1QE-S4-C
BrandBALLUFF
kr 1 610,61
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Block Retroreflective 0 → 55 m PNP M12 Connector - - 30V - Connector LED IP67 200 mA -
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Mfr. Part No.BOS 21M-PA-PK10-S4
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kr 1 971,49
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Block Retroreflective 0 → 4 m PNP M12 Connector - - 30V - Connector LED IP67 100 mA -
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Mfr. Part No.BOS 5K-PO-IX10-S75
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kr 1 191,05
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Block Through Beam (Emitter and Receiver) 0 → 10 m PNP 4-Pin M8 Connector - - 30V - Connector LED IP67 100 mA -
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Fork Through Beam (Fork) - PNP 3-Pin M8 Connector - - 30V - M8 Laser Light IP67 - -
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Mfr. Part No.BOS 23K-XI-RS11-S4
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kr 761,83
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Block Through Beam (Emitter) 0 → 20 m - 4-Pin M12 Connector - IO-LINK 30V - 4-Pin Connector LED IP6X, IPX6K 30 mA IO-Link