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
RS Stock No. 729-5139
BrandRS PRO
MYR450.05
Each
units
Block Diffuse 40 → 1000 mm NPN Cable - - - 30V - LED IP67 100 mA -
New
RS Stock No. 204-3996
BrandRS PRO
MYR137.02
Each
units
Barrel Through Beam (Receiver) 10 m PNP NO/NC 2m PVC Cable - - - 30V 2 m cable LED IP67 - -
New
RS Stock No. 202-4436
BrandRS PRO
MYR237.09
Each
units
Block Diffuse Reflection 300 mm PNP NO/NC M8 connector - - - - M8 - - - -
New
RS Stock No. 202-4453
BrandRS PRO
MYR225.65
Each
units
Block Diffuse Reflection 300 mm NPN NO/NC 2m PVC cable - - - - 2 m cable - - - -
New
RS Stock No. 202-5450
BrandRS PRO
MYR328.22
Each
units
Block Diffuse 0 → 2 m PNP NO/NC Terminal Block - - - - Terminal Infrared LED IP67 - -
New
RS Stock No. 202-5459
BrandRS PRO
MYR430.85
Each
units
Block Polarised Retro Reflection 12 m Relay NO/NC Terminal Block - 240V - 240V Terminal Red LED IP67 - -
New
RS Stock No. 204-3963
BrandRS PRO
MYR228.33
Each
units
Barrel Diffuse Reflection 150 mm NPN NO M12 Connector - - - 30V M12 Yellow LED IP67 - -
New
RS Stock No. 202-4460
BrandRS PRO
MYR259.86
Each
units
Block Polarized Retro Reflection 3 m PNP NO/NC M12 connector - - - - M12 - - - -
RS Stock No. 729-5145
BrandRS PRO
MYR475.10
Each
units
Block Retroreflective 0.15 → 10 m NPN 4-Pin M12 Connector - - - 30V - LED IP67 100 mA -
New
RS Stock No. 201-8161
BrandRS PRO
MYR259.86
Each
units
Block Polarised Retro Reflection 3 m NPN NO/NC Cable - - - 30 VDC M8 LED IP67 - -
New
RS Stock No. 202-4483
BrandRS PRO
MYR231.13
Each
units
Block Through Beam Reflection 60 m Relay NO/NC 2m PVC cable - - - - 2 m cable - - - -
RS Stock No. 903-3945
BrandRS PRO
MYR288.43
Each
units
Fork Through Beam (Fork) 7 mm PNP Cable - - - 30V Pre-Wired Infrared IP64 15 mA -
New
RS Stock No. 204-4012
BrandRS PRO
MYR153.59
Each
units
Barrel Through Beam (Receiver) 20 m PNP NO/NC 2m PVC Cable - - - 30V 2 m cable LED IP67 - -
New
RS Stock No. 202-4428
BrandRS PRO
MYR191.49
Each
units
Block Diffuse Reflection 100 mm NPN 2m PVC cable - - - - 2 m cable - - - -
RS Stock No. 285-891
BrandRS PRO
MYR1,054.54
Each
units
Block Through Beam (Emitter and Receiver) 10 m Relay 4-Terminal Screw - 250V - 240V Screw LED IP66 2 A -
RS Stock No. 729-5094
BrandRS PRO
MYR330.78
Each
units
Barrel Background Suppression 1 → 140 mm NPN 4-Wire Cable 2m - - - 30V - LED IP67 100 mA -
New
RS Stock No. 202-4425
BrandRS PRO
MYR259.86
Each
units
Block Diffuse Reflection 1 m NPN M8 connector - - - - M8 - - - -
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. 204-3974
BrandRS PRO
MYR228.33
Each
units
Barrel Diffuse Reflection 400 mm NPN NO/NC M12 Connector - - - 30V M12 Yellow LED IP67 - -
New
RS Stock No. 204-3973
BrandRS PRO
MYR200.73
Each
units
Barrel Diffuse Reflection 400 mm PNP NO/NC 2m PVC Cable - - - 30V 2 m cable Yellow LED IP67 - -