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. 512-4640
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Block Retroreflective 0.15 → 10 m PNP 4-Wire Cable 2m - - 30V - - LED IP67 100 mA -
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Compact Retroreflective Maximum of 10 m Relay 5-Wire Cable 2m 240V - 240V - Cable LED IP65 3 A -
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Block Multimode 1.3 m, 2 m, 11 m, 40 m Relay 5-Terminal Screw 240V - 240V - - Infrared IP65, IP67 3 A, 500 mA -
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Compact Through Beam (Emitter) 0.28 m, 0.8 m, 4 m, 30 m NPN/PNP 4-Pin M12 Connector - - 24V - - Infrared IP65 100 mA -
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Block Diffuse 20 → 120 mm PNP 4-Wire Cable 2m - - 30V - - LED IP65 100 mA -
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Block Background Suppression 20 → 350 mm NPN/PNP 4-Pin M12 Connector - - 30V - - LED IP66, IP67, IP69K 100 mA -
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Block Retroreflective 0.08 → 15 m PNP M12 Connector - - 30V - M12 LED IP67 20 mA -
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Block Through Beam (Fork) 3.18 → 8 mm Phototransistor Wire - - 1.7V - Wire Lead LED - 50 mA -
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Block Diffuse 0.2 → 10 m PNP M12 Connector - - 30V - - Laser Light IP67 200 mA -
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Compact Through Beam (Emitter) 30 m Solid State 2-Wire Cable 2m 240V - 240V - - Infrared IP65 3 A -
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Block Background Suppression 4 → 150 mm PNP 4-Pin M8 Connector - - 30V - - LED IP66, IP67 100 mA -
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Compact Through Beam (Emitter) 30 m - 4-Pin M12 Connector - - 24V - - Infrared IP65 100 mA -
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Block Background Suppression 1 → 18 mm PNP 3-Pin M8 Connector 0.2m Cable - - 30V - M8 LED IP67 20 mA -
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- - - Relay - - - - - - LED IP69 - -