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. 729-5151
FabrikantRS PRO
92,40 €
Each
Aantal stuks
Block Retroreflective 150 mm → 10 m PNP 4-Wire Cable 2m - - 30V - - LED IP67 100 mA -
RS-stocknr. 256-411
FabrikantRS PRO
106,02 €
Each
Aantal stuks
Barrel Retroreflective 4 m NPN/PNP M12 Connector - - 30V - - Infrared IP67 100 mA -
RS-stocknr. 729-5185
FabrikantRS PRO
109,27 €
Each
Aantal stuks
Block Background Suppression 5 → 250 mm PNP 4-Pin M8 Connector - - 24V - - LED IP67 100 mA -
RS-stocknr. 729-5113
FabrikantRS PRO
76,53 €
Each
Aantal stuks
Barrel Retroreflective 50 mm → 7 m PNP 4-Pin M12 Connector - - 30V - - LED IP67 100 mA -
RS-stocknr. 729-5189
FabrikantRS PRO
109,27 €
Each
Aantal stuks
Block Background Suppression 5 → 250 mm PNP Cable - - 24V - - LED IP67 100 mA -
RS-stocknr. 729-5090
FabrikantRS PRO
71,16 €
Each
Aantal stuks
Barrel Background Suppression 1 → 140 mm NPN 4-Pin M12 Connector - - 30V - - LED IP67 100 mA -
RS-stocknr. 729-5195
FabrikantRS PRO
69,86 €
Each
Aantal stuks
Block Retroreflective 7.2 m PNP 4-Pin M8 Connector - - 24V - - LED IP67 100 mA -
RS-stocknr. 729-5104
FabrikantRS PRO
70,63 €
Each
Aantal stuks
Barrel Background Suppression 1 → 140 mm PNP 4-Pin M12 Connector - - 30V - - LED IP67 100 mA -
RS-stocknr. 729-5101
FabrikantRS PRO
67,26 €
Each
Aantal stuks
Barrel Retroreflective 50 mm → 7 m NPN 4-Pin M12 Connector - - 30V - - LED IP67 100 mA -
RS-stocknr. 729-5176
FabrikantRS PRO
130,49 €
Each
Aantal stuks
Block Through Beam (Emitter) 20 m PNP Cable - - 30V - - LED IP67 100 mA -
RS-stocknr. 729-5214
FabrikantRS PRO
98,33 €
Each
Aantal stuks
Block Through Beam (Emitter) 15 m PNP Cable - - 24V - - LED IP67 500 mA -
RS-stocknr. 729-5205
FabrikantRS PRO
69,86 €
Each
Aantal stuks
Block Retroreflective 7.2 m PNP 3-Wire Cable 2m - - 24V - - LED IP67 100 mA -
RS-stocknr. 729-5191
FabrikantRS PRO
69,86 €
Each
Aantal stuks
Block Retroreflective 7.2 m NPN Cable - - 24V - - LED IP67 100 mA -
RS-stocknr. 729-5182
FabrikantRS PRO
109,27 €
Each
Aantal stuks
Block Background Suppression 10 → 140 mm NPN 2-Wire Cable 2m - - 24V - - LED IP67 100 mA -
RS-stocknr. 729-5198
FabrikantRS PRO
69,86 €
Each
Aantal stuks
Block Retroreflective 7.2 m NPN 4-Pin M8 Connector - - 24V - - LED IP67 100 mA -
Nieuw
RS-stocknr. 202-4458
FabrikantRS PRO
49,27 €
Each
Aantal stuks
Block Polarized Retro Reflection 3 m NPN NO/NC M12 connector - - - - M12 - - - -
RS-stocknr. 440-5639
FabrikantRS PRO
95,22 €
Each
Aantal stuks
Barrel Diffuse 100 mm NPN/PNP M12 Connector - - 30V - - Infrared IP67 100 mA -
Nieuw
RS-stocknr. 202-4459
FabrikantRS PRO
47,11 €
Each
Aantal stuks
Block Polarized Retro Reflection 3 m PNP NO/NC 2m PVC cable - - - - 2 m cable - - - -
Nieuw
RS-stocknr. 204-3975
FabrikantRS PRO
43,29 €
Each
Aantal stuks
Barrel Diffuse Reflection 400 mm PNP NO/NC M12 Connector - - 30V - M12 Yellow LED IP67 - -
Nieuw
RS-stocknr. 202-4469
FabrikantRS PRO
51,43 €
Each
Aantal stuks
Block Background Suppression Sensor 100 mm NPN NO/NC M12 connector - - - - M12 - - - -
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