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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Omschrijving Prijs 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-stocknr. 498-1795
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FabrikantBaumer
160,00 €
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Block Diffuse 20 → 120 mm PNP 4-Wire Cable 2m - - 30V - - LED IP65 100 mA -
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FabrikantBaumer
153,00 €
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Block Diffuse 20 → 120 mm PNP 4-Pin M8 Connector - - 30V - - LED IP67 100 mA -
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FabrikantBaumer
190,50 €
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Block Diffuse 15 → 300 mm PNP 4-Pin M8 Connector - - 30V - - LED IP67 100 mA -
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FabrikantBaumer
122,00 €
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Block Diffuse 20 → 350 mm PNP 4-Pin M8 Connector - - 30V - - LED IP67 100 mA -
RS-stocknr. 370-4187
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FabrikantBaumer
82,30 €
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Barrel Diffuse 60 → 430 mm PNP 4-Pin M12 Connector - - 30V - - Infrared IP65 200 mA -
RS-stocknr. 123-4134
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FabrikantBaumer
1.113,00 €
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Block Background Suppression 30 → 130 mm Analogue 5-Pin M12 Connector - - 28V - 5-Pin Connector Laser Light IP67 120 mA -
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FabrikantnummerOHDM 16P5001
FabrikantBaumer
522,00 €
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Block Diffuse 25 → 300 mm PNP Cable - - 30V - - Laser Light IP67 200 mA -
RS-stocknr. 399-1915
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386,00 €
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Block Diffuse 22 → 130 mm PNP Cable - - 30V - - Laser Light IP65 100 mA -
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Block Diffuse 3 → 150 mm PNP 4-Pin M8 Connector - - 30V - - Laser Light IP67 100 mA -
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139,50 €
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Block Diffuse 30 → 200 mm PNP 4-Pin M8 Connector - - 30V - - LED IP67 100 mA -
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Block Diffuse 5 → 200 mm PNP 4-Pin M8 Connector - - 30V Phototransistor - LED IP67 100 mA -
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FabrikantnummerOR18.GR-PW1P.71O
FabrikantBaumer
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Barrel Diffuse 5 → 120 mm PNP 4-Pin M12 Connector - - 30V - Threaded LED IP67 40 (No Load) mA -
RS-stocknr. 136-5791
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Barrel Retroreflective 15 (Actual) mm, 16 (Nominal) mm PNP 4-Pin M12 Connector - - 30V - Threaded Laser Light IP67 45 (No Load) mA -
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FabrikantnummerOHDK 14P5101/S35A
FabrikantBaumer
312,00 €
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Block Diffuse 20 → 350 mm PNP 4-Pin M8 Connector - - 30V - - Laser Light IP67 100 mA -
RS-stocknr. 136-5792
FabrikantnummerOR18.RR-PW1P.71O
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36,10 €
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Barrel Retroreflective 3.5 (Actual) m, 4.5 (Nominal) m PNP 4-Pin M12 Connector - - 30V - Threaded LED IP67 40 (No Load) mA -
RS-stocknr. 123-4131
FabrikantnummerOADM 20I5440/S14C
FabrikantBaumer
1.113,00 €
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Block Background Suppression 30 → 50 mm Analogue 5-Pin M12 Connector - - 28V - 5-Pin Connector Laser Light IP67 120 mA -
RS-stocknr. 187-1815
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1.494,00 €
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Rectangular Distance 40 → 140 mm Analogue 8 Pin M12 Connector - - 28V - M12 Connector - IP67 <100 (Output) mA -
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32,30 €
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Block Retroreflective 30 → 300 mm Push Pull 4-Pin M8 Connector - IO-LINK 30V - 4-Pin Connector LED IP67 45 mA IO-Link