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