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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Beskrivning Pris Sensor Style Detection Type Detection Range Output Type Electrical Connection Maximum AC Voltage Maximum DC Voltage Optical Technology Terminal Type Light Source IP Rating Maximum Current Interface Response Time
RS-artikelnummer 404-051
Tillv. art.nrGLV18-8-450/25/102/159
VarumärkePepperl + Fuchs
519,00 kr
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Barrel Diffuse 450 mm NPN 3-Pin M12 Connector - 30V - - LED IP67 100 mA - <=1 ms
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Tillv. art.nrGLV12-8-200/37/40B/115
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Barrel Diffuse 200 mm PNP 4-Wire Cable 2m - 30V - - LED IP67 300 mA - <=0.7 ms
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Tillv. art.nrGD18/GV18/59/102/115
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Barrel Through Beam (Emitter and Receiver) 20 m NPN Cable - 30V - - LED IP67 100 mA - <=1 ms
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Tillv. art.nrOMT100-R101-2EP-IO-V31
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Block Background Suppression 40 → 100 mm NPN/PNP 4-Pin M8 Connector - 30V - 4-Pin Connector LED IP67, IP69, IP69K 100 mA IO-Link 2 ms
RS-artikelnummer 229-018
Tillv. art.nrGLV18-8-200/115/120
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Barrel Diffuse 200 mm PNP 4-Wire Cable 2m - 30V - - LED IP67 100 mA - <=1 ms
RS-artikelnummer 817-1605
Tillv. art.nrRLK31-54/31/115
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Block Retroreflective 9000 mm Push Pull 5-Wire Cable 2m 240V 240V - - LED IP67 3 A - <=25 ms
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Tillv. art.nrGL10-RT/32/40A/98A
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Fork Through Beam (Fork) 10 mm PNP 3-Pin M8 Connector - 30V - - LED IP67 200 mA - 0.2 ms
RS-artikelnummer 898-6719
Tillv. art.nr115969 M12-F1/76b/124
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Block Through Beam (Emitter) 0 → 16 (Effective) m PNP 5-Pin M12 Connector 300V 30V - M12 LED IP67 35 mA - 0.5 ms
RS-artikelnummer 891-9501
Tillv. art.nrML7-8-H-350-IR/59/65a/136/143
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Block Background Suppression 10 → 350 mm Push Pull 4-Pin M8 Connector - 30V - M8 Connector Infrared IP67, IP69K <20 mA - 2 ms
RS-artikelnummer 229-034
Tillv. art.nrGLV18-8-450/115/120
VarumärkePepperl + Fuchs
508,00 kr
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Barrel Diffuse 450 mm PNP 4-Wire Cable 2m - 30V - - LED IP67 100 mA - <=1 ms
RS-artikelnummer 891-9514
Tillv. art.nrRLK31-8-2500-IR/31/115
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Block Diffuse 0 → 2500 mm Relay 5-Wire Cable 2m 240V 240V - - Infrared IP67 40 mA - 25 ms
RS-artikelnummer 404-027
Tillv. art.nrGLV18-8-200-S/25/102/159
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Barrel Diffuse 200 mm NPN 3-Pin M12 Connector - 30V - - LED IP67 100 mA - <=1 ms
RS-artikelnummer 229-024
Tillv. art.nrGLV18-8-200/25/102/115
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519,00 kr
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Barrel Diffuse 50 → 200 mm NPN 3-Wire Cable 2m - 30V - - LED IP67 10 mA - 1 ms
RS-artikelnummer 447-143
Tillv. art.nrGL220-RT/32/40A/98A
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Fork Through Beam (Fork) 220 mm PNP 3-Pin M8 Connector - 30V - - LED IP67 100 mA - <=160 μs
RS-artikelnummer 229-080
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Barrel Retroreflective 6.5 m PNP 4-Wire Cable 2m - 30V - - LED IP67 100 mA - <=1 ms
RS-artikelnummer 447-147
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Fork Through Beam (Fork) 30 mm PNP 3-Pin M8 Connector - 30V - - LED IP67 100 mA - <=160 μs
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Fork Through Beam (Fork) 121 mm PNP 3-Pin M8 Connector - 30V - - LED IP67 200 mA - 1 ms
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Barrel Diffuse 20 → 120 mm Push Pull 4-Pin M12 Connector - 30V - - LED IP67 200 mA - 1 ms
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- Retroreflective 5 → 300 cm PNP 4-Pin M8 Connector - 30V - - Laser Light IP67 100 mA - -