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. 903-3936
FabrikantRS PRO
73,18 €
Each
Aantal stuks
Fork Through Beam (Fork) 30 mm PNP 4-Wire Cable 2m - - 30V - Pre-Wired Infrared IP67 15 mA -
RS-stocknr. 729-5110
FabrikantRS PRO
66,18 €
Each
Aantal stuks
Barrel Retroreflective 50 mm → 7 m NPN 4-Wire Cable 2m - - 30V - - LED IP67 100 mA -
RS-stocknr. 903-3958
FabrikantRS PRO
66,15 €
Each
Aantal stuks
Fork Through Beam (Fork) 15 mm PNP Cable - - 30V - Pre-Wired Infrared IP64 15 mA -
RS-stocknr. 903-3927
FabrikantRS PRO
73,18 €
Each
Aantal stuks
Fork Through Beam (Fork) 30 mm NPN/PNP 4-Wire Cable 2m - - 30V - Pre-Wired Infrared IP67 15 mA -
RS-stocknr. 729-5154
FabrikantRS PRO
89,71 €
Each
Aantal stuks
Block Retroreflective 150 mm → 10 m NPN Cable - - 30V - - LED IP67 100 mA -
RS-stocknr. 729-5141
FabrikantRS PRO
79,98 €
Each
Aantal stuks
Block Diffuse 40 → 1000 mm PNP Cable - - 30V - - LED IP67 100 mA -
RS-stocknr. 285-891
FabrikantRS PRO
233,54 €
Each
Aantal stuks
Block Through Beam (Emitter and Receiver) 10 m Relay 4-Terminal Screw 250V - 240V - Screw LED IP66 2 A -
RS-stocknr. 729-5139
FabrikantRS PRO
79,98 €
Each
Aantal stuks
Block Diffuse 40 → 1000 mm NPN Cable - - 30V - - LED IP67 100 mA -
RS-stocknr. 903-3945
FabrikantRS PRO
40,00 €
Each
Aantal stuks
Fork Through Beam (Fork) 7 mm PNP Cable - - 30V - Pre-Wired Infrared IP64 15 mA -
RS-stocknr. 729-5148
FabrikantRS PRO
81,37 €
Each
Aantal stuks
Block Diffuse 40 → 1000 mm PNP 4-Pin M12 Connector - - 30V - - LED IP67 100 mA -
RS-stocknr. 256-405
FabrikantRS PRO
102,93 €
Each
Aantal stuks
Barrel Diffuse 200 mm PNP M12 Connector - - 30V - - Infrared IP67 100 mA -
RS-stocknr. 903-3939
FabrikantRS PRO
73,18 €
Each
Aantal stuks
Fork Through Beam (Fork) 30 mm NPN/PNP 4-Wire Cable 2m - - 30V - Pre-Wired Infrared IP67 15 mA -
RS-stocknr. 256-629
FabrikantRS PRO
189,06 €
Each
Aantal stuks
Block Retroreflective 30 mm → 3 m Relay 4-Terminal Screw 250V - 250V - Screw LED IP66 2 A -
RS-stocknr. 729-5126
FabrikantRS PRO
102,33 €
Each
Aantal stuks
Barrel Through Beam (Emitter) 28 m NPN 4-Pin M12 Connector - - 30V - - LED IP67 100 mA -
RS-stocknr. 729-5157
FabrikantRS PRO
89,71 €
Each
Aantal stuks
Block Retroreflective 150 mm → 10 m PNP 4-Pin M12 Connector - - 30V - - LED IP67 100 mA -
RS-stocknr. 440-5623
FabrikantRS PRO
92,45 €
Each
Aantal stuks
Barrel Retroreflective 2 m PNP M12 Connector - - 30V - - LED IP67 100 mA -
RS-stocknr. 903-3942
FabrikantRS PRO
66,15 €
Each
Aantal stuks
Fork Through Beam (Fork) 7 mm PNP Cable - - 30V - Pre-Wired Infrared IP64 15 mA -
RS-stocknr. 729-5145
FabrikantRS PRO
76,90 €
Each
Aantal stuks
Block Retroreflective 150 mm → 10 m NPN 4-Pin M12 Connector - - 30V - - LED IP67 100 mA -
RS-stocknr. 729-5173
FabrikantRS PRO
106,09 €
Each
Aantal stuks
Block Background Suppression 5 → 250 mm NPN 4-Pin M8 Connector - - 24V - - LED IP67 100 mA -
RS-stocknr. 729-5107
FabrikantRS PRO
68,57 €
Each
Aantal stuks
Barrel Background Suppression 1 → 140 mm PNP 4-Wire Cable 2m - - 30V - - LED IP67 100 mA -
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