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. 729-5123
BrandRS PRO
MYR542.21
Each
units
Barrel Through Beam (Emitter) 28 m PNP 4-Pin M12 Connector - - - 30V - LED IP67 100 mA -
New
RS Stock No. 202-5457
BrandRS PRO
MYR396.64
Each
units
Block Polarised Retro Reflection 12 m NPN NO/NC Terminal Block - - - 30V Terminal Red LED IP67 - -
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. 204-4001
BrandRS PRO
MYR125.93
Each
units
Barrel Through Beam (Receiver) 10 m NPN NO/NC 2m PVC Cable - - - 30V 2 m cable LED IP67 - -
New
RS Stock No. 204-3977
BrandRS PRO
MYR228.33
Each
units
Barrel Diffuse Reflection 100 cm PNP NO/NC M12 Connector - - - 30V 2 m cable Yellow LED IP67 - -
New
RS Stock No. 204-3981
BrandRS PRO
MYR200.73
Each
units
Barrel Retro Reflection 3 m PNP NO/NC 2m PVC Cable - - - 30V 2 m cable Yellow LED IP67 - -
New
RS Stock No. 202-4467
BrandRS PRO
MYR259.86
Each
units
Block Background Suppression Sensor 100 mm NPN NO/NC 2m PVC cable - - - - 2 m cable - - - -
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. 202-4470
BrandRS PRO
MYR259.86
Each
units
Block Background Suppression Sensor 100 mm PNP NO/NC 2m PVC cable - - - - 2 m cable - - - -
New
RS Stock No. 202-4460
BrandRS PRO
MYR259.86
Each
units
Block Polarized Retro Reflection 3 m PNP NO/NC M12 connector - - - - M12 - - - -
New
RS Stock No. 204-4008
BrandRS PRO
MYR159.13
Each
units
Barrel Through Beam (Receiver) 20 m NPN NO/NC 2m PVC Cable - - - 30V 2 m cable LED IP67 - -
RS Stock No. 729-5107
BrandRS PRO
MYR340.69
Each
units
Barrel Background Suppression 1 → 140 mm PNP Cable - - - 30V - LED IP67 100 mA -
New
RS Stock No. 202-5446
BrandRS PRO
MYR795.54
Each
units
Block Background Suppression 0 → 2 m PNP+NPN 2m Cable - - - - 2 m cable Red LED IP67 - -
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. 202-5448
BrandRS PRO
MYR328.22
Each
units
Block Diffuse 0 → 2 m NPN NO/NC Terminal Block - - - - Terminal Infrared LED - - -
New
RS Stock No. 202-4442
BrandRS PRO
MYR156.09
Each
units
Block Through Beam (Receiver) 10 m NPN NO/NC M8 connector - - - - M8 - - - -
RS Stock No. 729-5113
BrandRS PRO
MYR407.53
Each
units
Barrel Retro-Reflective 0.05 → 7 m PNP 4-Pin M12 Connector - - - 30V - LED IP67 100 mA -
RS Stock No. 729-5185
BrandRS PRO
MYR547.38
Each
units
Block Background Suppression 5 → 250 mm PNP 4-Pin M8 Connector - - - 24V - LED IP67 100 mA -
New
RS Stock No. 202-4426
BrandRS PRO
MYR248.47
Each
units
Block Diffuse Reflection 1 m PNP 2m PVC cable - - - - 2 m cable - - - -
New
RS Stock No. 202-4425
BrandRS PRO
MYR259.86
Each
units
Block Diffuse Reflection 1 m NPN M8 connector - - - - M8 - - - -