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.

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 Terminal Type Light Source IP Rating Maximum Current Interface
New
RS Stock No. 204-3983
BrandRS PRO
MYR191.49
Each
units
Barrel Retro Reflection 3 m PNP NO M12 Connector - - - 30V M12 Yellow LED IP67 - -
New
RS Stock No. 202-4447
BrandRS PRO
MYR103.88
Each
units
Block Through Beam (Emitter) 10 m - M8 connector - - - - M8 - - - -
New
RS Stock No. 202-5452
BrandRS PRO
MYR339.66
Each
units
Block Diffuse 0 → 800 mm Relay NO/NC Terminal Block - - - - Terminal - IP67 - -
New
RS Stock No. 202-4471
BrandRS PRO
MYR271.24
Each
units
Block Background Suppression Sensor 100 mm PNP NO/NC M12 connector - - - - M12 - - - -
New
RS Stock No. 202-4427
BrandRS PRO
MYR259.86
Each
units
Block Diffuse Reflection 1 m PNP M8 connector - - - - M8 - - - -
New
RS Stock No. 202-4443
BrandRS PRO
MYR149.12
Each
units
Block Through Beam (Receiver) 10 m PNP NO/NC 2m PVC cable - - - - 2 m cable - - - -
New
RS Stock No. 202-4476
BrandRS PRO
MYR305.45
Each
units
Block Diffuse Reflection 300 mm Relay NO/NC 2m PVC cable - - - - 2 m cable - - - -
New
RS Stock No. 204-4020
BrandRS PRO
MYR192.39
Each
units
Barrel Polarised Retro Reflection 3 m NPN NO/NC M12 Connector - - - 30V M12 LED IP67 - -
New
RS Stock No. 204-4009
BrandRS PRO
MYR159.13
Each
units
Barrel Through Beam (Receiver) 20 m PNP NO/NC 2m PVC Cable - - - 30V 2 m cable LED IP67 - -
New
RS Stock No. 204-4006
BrandRS PRO
MYR137.02
Each
units
Barrel Through Beam (Receiver) 20 m PNP NO/NC 2m PVC Cable - - - 30V 2 m cable LED IP67 - -
New
RS Stock No. 204-3965
BrandRS PRO
MYR228.33
Each
units
Barrel Diffuse Reflection 150 mm PNP NO M12 Connector - - - 30V M12 Yellow LED IP67 - -
New
RS Stock No. 201-8163
BrandRS PRO
MYR259.86
Each
units
Block Polarised Retro Reflection 3 m PNP NO/NC Cable - - - 30 VDC M8 LED IP67 - -
New
RS Stock No. 204-4007
BrandRS PRO
MYR106.09
Each
units
Barrel Through Beam (Emitter) 20 m NPN NO+NC 2m PVC Cable - - - 30V 2 m cable LED IP67 - -
New
RS Stock No. 202-4439
BrandRS PRO
MYR282.68
Each
units
Block Polarized Retro Reflection 4 m PNP NO/NC 2m PVC cable - - - - 2 m cable - - - -
New
RS Stock No. 202-5458
BrandRS PRO
MYR396.64
Each
units
Block Polarised Retro Reflection 12 m PNP NO/NC Terminal Block - - - 30V Terminal Red LED IP67 - -
New
RS Stock No. 202-5462
BrandRS PRO
MYR272.13
Each
units
Block Through Beam (Receiver) 30 m Relay NO/NC Terminal Block - 240V - 240V Terminal Infrared LED IP67 - -
RS Stock No. 729-5157
BrandRS PRO
MYR467.66
Each
units
Block Retroreflective 0.15 → 10 m PNP 4-Pin M12 Connector - - - 30V - LED IP67 100 mA -
New
RS Stock No. 204-3966
BrandRS PRO
MYR237.63
Each
units
Barrel Diffuse Reflection 150 mm NPN NO 2m PVC Cable - - - 30V 2 m cable Yellow LED IP67 - -
New
RS Stock No. 204-4017
BrandRS PRO
MYR192.39
Each
units
Barrel Polarised Retro Reflection 3 m NPN NO/NC 2m PVC Cable - - - 30V 2 m cable LED IP67 - -
New
RS Stock No. 204-3997
BrandRS PRO
MYR98.76
Each
units
Barrel Through Beam (Emitter) 20 m NPN NO+NC 2m PVC Cable - - - 30V 2 m cable LED IP67 - -