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.


...
Read more Read less

Filters

Viewing 1 - 20 of 1680 products
Results per page
Description Price Sensor Style Detection Type Detection Range Output Type Electrical Connection Maximum AC Voltage Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface Response Time Housing Material
RS Stock No. 903-3958
BrandRS PRO
$94.56
Each
units
Fork Through Beam (Fork) 15 mm PNP Cable - 30V Pre-Wired Infrared IP64 15 mA - 1 ms PBT
RS Stock No. 729-5101
BrandRS PRO
$145.39
Each
units
Barrel Retro-Reflective 0.05 → 7 m NPN 4-Pin M12 Connector - 30V - LED IP67 100 mA - <=0.5 ms Nickel Plated Brass, PC
RS Stock No. 903-3945
BrandRS PRO
$91.22
Each
units
Fork Through Beam (Fork) 7 mm PNP Cable - 30V Pre-Wired Infrared IP64 15 mA - 1 ms PBT
RS Stock No. 903-3942
BrandRS PRO
$91.22
Each
units
Fork Through Beam (Fork) 7 mm PNP Cable - 30V Pre-Wired Infrared IP64 15 mA - 1 ms PBT
RS Stock No. 729-5113
BrandRS PRO
$152.02
Each
units
Barrel Retro-Reflective 0.05 → 7 m PNP 4-Pin M12 Connector - 30V - LED IP67 100 mA - <=0.5 ms Nickel Plated Brass, PC
RS Stock No. 729-5191
BrandRS PRO
$142.12
Each
units
Block Retroreflective 7.2 m NPN Cable - 24V - LED IP67 100 mA - <625 μs ABS, PC
RS Stock No. 903-3936
BrandRS PRO
$112.41
Each
units
Fork Through Beam (Fork) 30 mm PNP 4-Wire Cable 2m - 30V Pre-Wired Infrared IP67 15 mA - 1 ms Aluminium Alloy
RS Stock No. 729-5195
BrandRS PRO
$142.12
Each
units
Block Retro-Reflective 7.2 m PNP 4-Pin M8 Connector - 24V - LED IP67 100 mA - <625 μs ABS, PC
RS Stock No. 903-3933
BrandRS PRO
$101.18
Each
units
Fork Through Beam (Fork) 30 mm PNP 4-Wire Cable 2m - 30V Pre-Wired Infrared IP67 15 mA - 1 ms Aluminium Alloy
RS Stock No. 256-411
BrandRS PRO
$202.20
Each
units
Barrel Retroreflective 4 m NPN/PNP M12 Connector - 30V - Infrared IP67 100 mA - 6 ms Polyamide
RS Stock No. 903-3939
BrandRS PRO
$98.23
Each
units
Fork Through Beam (Fork) 30 mm NPN/PNP 4-Wire Cable 2m - 30V Pre-Wired Infrared IP67 15 mA - 1 ms Aluminium Alloy
RS Stock No. 729-5139
BrandRS PRO
$172.83
Each
units
Block Diffuse 40 → 1000 mm NPN Cable - 30V - LED IP67 100 mA - <=2.5 ms ABS, PMMA
RS Stock No. 377-8419
BrandRS PRO
$409.93
Each
units
Fork Through Beam (Fork) 2 mm PNP 4-Wire Cable 2m - 30V - LED IP67 100 mA - 0.5 ms ABS
RS Stock No. 440-5623
BrandRS PRO
$153.40
Each
units
Barrel Retroreflective 2 m PNP M12 Connector - 30V - LED IP67 100 mA - - Nickel Plated Brass
RS Stock No. 285-891
BrandRS PRO
$347.58
Each
units
Block Through Beam (Emitter and Receiver) 10 m Relay 4-Terminal Screw 250V 240V Screw LED IP66 2 A - 5 ms Acrylic Resin
RS Stock No. 729-5107
BrandRS PRO
$145.39
Each
units
Barrel Background Suppression 1 → 140 mm PNP Cable - 30V - LED IP67 100 mA - <=0.5 ms Nickel Plated Brass, PC
RS Stock No. 729-5141
BrandRS PRO
$172.83
Each
units
Block Diffuse 40 → 1000 mm PNP Cable - 30V - LED IP67 100 mA - <=2.5 ms ABS, PMMA
RS Stock No. 729-5205
BrandRS PRO
$142.12
Each
units
Block Retroreflective 7.2 m PNP 3-Wire Cable 2m - 24V - LED IP67 100 mA - <625 μs ABS, PC
RS Stock No. 729-5154
BrandRS PRO
$199.52
Each
units
Block Retroreflective 0.15 → 10 m NPN Cable - 30V - LED IP67 100 mA - 2.5 ms ABS, PMMA
RS Stock No. 729-5167
BrandRS PRO
$268.78
Each
units
Block Through Beam (Emitter) 20 m PNP 4-Pin M12 Connector - 30V - LED IP67 100 mA - 2.5 ms ABS, PMMA
Related Products
Horizontal and vertical format versionsPBT Housing, denaturated polyallyate ...
Description:
Horizontal and vertical format versionsPBT Housing, denaturated polyallyate lens, IP67 sealedPNP and NPN output configurations. Light ON/dark ON operation. Two-turn sensitivity adjustor. Light and stability LED indication. Operating temperature range -25° → +55°CShort circuit and reverse polarity protection. ...
Diecast metal housing rated to IP67 with hinged ...
Description:
Diecast metal housing rated to IP67 with hinged connector socket which rotates through 90°Outputs and inputs short circuit and reverse polarity protected. Interference suppressionPNP or NPN, light ON/dark ON selectable output. Fitted with polarising filter.
Panasonic PM-45 series ultra-small U-shaped micro photoelectric sensors. ...
Description:
Panasonic PM-45 series ultra-small U-shaped micro photoelectric sensors. The PM series sensors feature a through beam detection type with the emitter and receiver contained within a single U-shaped housing. A large operating indicator lights up to make operation identification easy ...
Six sensing methods. Cable model (three cable lengths) ...
Description:
Six sensing methods. Cable model (three cable lengths) and M8 connector models are available.NPN output, PNP output, light ON, dark ON can be selected.Sensing range doubled with SA1E-T through-beam and SA1E-P polarized retro-reflective models.Highly stable with excellent resistance against vibration ...