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.RS Components offer an extensive selection of photoelectric sensors for use various industrial applications. Our high-quality products are supplied from leading brands including Omron, Sick, Pepperl + Fuchs Telemecanique Sensors Baumer, Banner and of course RS PRO. You can learn more in our complete guide to photoelectric sensors.

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 can detect 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 must 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 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.

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Description Price Sensor Style Detection Type Detection Range Output Type Electrical Connection Switching Mode Maximum AC Voltage Communication Protocol Maximum DC Voltage Optical Technology Terminal Type Light Source IP Rating Maximum Current
RS Stock No. 729-5117
BrandRS PRO
kr 817,42
Each
Units
Barrel Retroreflective 50 mm → 7 m PNP 4 Wire Cable 2 m - - - 30V - - LED IP67 100 mA
RS Stock No. 729-5113
BrandRS PRO
kr 917,98
Each
Units
Barrel Retroreflective 50 mm → 7 m PNP M12 4 Pin Connector - - - 30V - - LED IP67 100 mA
RS Stock No. 256-411
BrandRS PRO
kr 1 210,86
Each
Units
Barrel Retroreflective 4 m NPN/PNP M12 Connector - - - 30V - - Infrared IP67 100 mA
RS Stock No. 377-8419
BrandRS PRO
kr 3 546,90
Each
Units
Fork Through Beam 2 mm PNP 4 Wire Cable 2 m - - - 30V - - LED IP67 100 mA
RS Stock No. 729-5135
BrandRS PRO
kr 964,18
Each
Units
Block Diffuse 40 mm → 1 m NPN M12 4 Pin Connector - - - 30V - - LED IP67 100 mA
RS Stock No. 903-3939
BrandRS PRO
kr 881,89
Each
Units
Fork Through Beam 30 mm NPN NO 4 Wire Cable 2 m - - - 30V - Pre-Wired Infrared IP67 15 mA
RS Stock No. 285-885
BrandRS PRO
kr 2 126,45
Each
Units
Block Diffuse 700 mm Relay 4 Terminal Screw - 250V - 240V - Screw Infrared LED IP66 2 A
RS Stock No. 729-5101
BrandRS PRO
kr 806,55
Each
Units
Barrel Retroreflective 50 mm → 7 m NPN M12 4 Pin Connector - - - 30V - - LED IP67 100 mA
RS Stock No. 729-5126
BrandRS PRO
kr 1 177,37
Each
Units
Barrel Through Beam 28 m NPN M12 4 Pin Connector - - - 30V - - LED IP67 100 mA
RS Stock No. 202-4450
BrandRS PRO
kr 593,69
Each
Units
Block Background Suppression 350 mm PNP NO/NC Cable 2 m - - - - - Cable 2 m - - -
RS Stock No. 202-5453
BrandRS PRO
kr 792,74
Each
Units
Block Retroreflective 5 m NPN NO/NC Terminal Block - - - 30V - Terminal Infrared LED IP67 -
RS Stock No. 202-5450
BrandRS PRO
kr 717,40
Each
Units
Block Diffuse 0 → 2 m PNP NO/NC Terminal Block - - - - - Terminal Infrared LED IP67 -
RS Stock No. 204-3973
BrandRS PRO
kr 439,10
Each
Units
Barrel Diffuse 400 mm PNP NO/NC Cable 2 m - - - 30V - Cable 2 m Yellow LED IP67 -
RS Stock No. 202-4451
BrandRS PRO
kr 618,58
Each
Units
Block Background Suppression 350 mm PNP NO/NC M8 Connector - - - - - M8 Connector - - -
RS Stock No. 202-4437
BrandRS PRO
kr 690,77
Each
Units
Block Polarised Retro Reflection 4 m NPN NO/NC M8 Connector - - - - - M8 Connector - - -
RS Stock No. 202-4477
BrandRS PRO
kr 692,51
Each
Units
Block Polarised Retro Reflection 5 m PNP/NPN Cable 2 m - - - - - Cable 2 m - - -
RS Stock No. 202-5454
BrandRS PRO
kr 792,74
Each
Units
Block Retroreflective 5 m PNP NO/NC Terminal Block - - - 30V - Terminal Infrared LED IP67 -
RS Stock No. 202-4461
BrandRS PRO
kr 237,65
Each
Units
Block Through Beam Emitter 20 m - Cable 2 m - - - - - Cable 2 m - - -
RS Stock No. 202-4447
BrandRS PRO
kr 227,21
Each
Units
Block Through Beam Emitter 10 m - M8 Connector - - - - - M8 Connector - - -
RS Stock No. 202-4469
BrandRS PRO
kr 593,69
Each
Units
Block Background Suppression 100 mm NPN NO/NC M12 connector - - - - - M12 Connector - - -