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 1814 products
Results per page
Description Price Sensor Style Detection Type Detection Range Output Type Electrical Connection Maximum AC Voltage Maximum DC Voltage Optical Technology Terminal Type Light Source IP Rating Maximum Current Interface Response Time
RS Stock No. 729-5117
BrandRS PRO
€73.71
Each
units
Barrel Retroreflective 0.05 → 7 m PNP 4-Wire Cable 2m - 30V - - LED IP67 100 mA - <=0.5 ms
RS Stock No. 729-5107
BrandRS PRO
€74.96
Each
units
Barrel Background Suppression 1 → 140 mm PNP 4-Wire Cable 2m - 30V - - LED IP67 100 mA - <=0.5 ms
RS Stock No. 729-5104
BrandRS PRO
€74.96
Each
units
Barrel Background Suppression 1 → 140 mm PNP 4-Pin M12 Connector - 30V - - LED IP67 100 mA - <=0.5 ms
RS Stock No. 729-5113
BrandRS PRO
€75.74
Each
units
Barrel Retroreflective 0.05 → 7 m PNP 4-Pin M12 Connector - 30V - - LED IP67 100 mA - <=0.5 ms
RS Stock No. 729-5101
BrandRS PRO
€74.96
Each
units
Barrel Retroreflective 0.05 → 7 m NPN 4-Pin M12 Connector - 30V - - LED IP67 100 mA - <=0.5 ms
RS Stock No. 256-405
BrandRS PRO
€99.93
Each
units
Barrel Diffuse 200 mm PNP M12 Connector - 30V - - Infrared IP67 100 mA - 6 ms
RS Stock No. 729-5110
BrandRS PRO
€73.71
Each
units
Barrel Retroreflective 0.05 → 7 m NPN 4-Wire Cable 2m - 30V - - LED IP67 100 mA - <=0.5 ms
RS Stock No. 729-5195
BrandRS PRO
€75.97
Each
units
Block Retroreflective 7.2 m PNP 4-Pin M8 Connector - 24V - - LED IP67 100 mA - <625 μs
RS Stock No. 729-5198
BrandRS PRO
€75.97
Each
units
Block Retroreflective 7.2 m NPN 4-Pin M8 Connector - 24V - - LED IP67 100 mA - <625 μs
RS Stock No. 729-5151
BrandRS PRO
€96.05
Each
units
Block Retroreflective 0.15 → 10 m PNP 4-Wire Cable 2m - 30V - - LED IP67 100 mA - 2.5 ms
RS Stock No. 729-5090
BrandRS PRO
€74.96
Each
units
Barrel Background Suppression 1 → 140 mm NPN 4-Pin M12 Connector - 30V - - LED IP67 100 mA - <=0.5 ms
RS Stock No. 256-411
BrandRS PRO
€99.93
Each
units
Barrel Retroreflective 4 m NPN/PNP M12 Connector - 30V - - Infrared IP67 100 mA - 6 ms
RS Stock No. 729-5205
BrandRS PRO
€75.97
Each
units
Block Retroreflective 7.2 m PNP 3-Wire Cable 2m - 24V - - LED IP67 100 mA - <625 μs
RS Stock No. 440-5639
BrandRS PRO
€89.75
Each
units
Barrel Diffuse 100 mm NPN/PNP M12 Connector - 30V - - Infrared IP67 100 mA - -
RS Stock No. 903-3936
BrandRS PRO
€71.03
Each
units
Fork Through Beam (Fork) 30 mm PNP 4-Wire Cable 2m - 30V - Pre-Wired Infrared IP67 15 mA - 1 ms
RS Stock No. 903-3933
BrandRS PRO
€71.03
Each
units
Fork Through Beam (Fork) 30 mm PNP 4-Wire Cable 2m - 30V - Pre-Wired Infrared IP67 15 mA - 1 ms
RS Stock No. 729-5123
BrandRS PRO
€113.01
Each
units
Barrel Through Beam (Emitter) 28 m PNP 4-Pin M12 Connector - 30V - - LED IP67 100 mA - <=0.5 ms
RS Stock No. 729-5191
BrandRS PRO
€75.97
Each
units
Block Retroreflective 7.2 m NPN Cable - 24V - - LED IP67 100 mA - <625 μs
RS Stock No. 285-885
BrandRS PRO
€178.15
Each
units
Block Diffuse 700 mm Relay 4-Terminal Screw 250V 240V - Screw Infrared LED IP66 2 A - 5 ms
RS Stock No. 729-5139
BrandRS PRO
€90.04
Each
units
Block Diffuse 40 → 1000 mm NPN Cable - 30V - - LED IP67 100 mA - <=2.5 ms
Related Products
Miniature sensor rangeThe visible red Point Spot light ...
Description:
Miniature sensor rangeThe visible red Point Spot light makes alignment very easyRange: 250 mmSensitivity adjustment by potentiometerModulated, red light 617 nmSupply voltage: 10 to 30 VDCOutput: 100 mA, NPN or PNP presetMake and break switching functionLED indication for output, stability ...
The PD30CTD02..WE sensor family comes in a compact ...
Description:
The PD30CTD02..WE sensor family comes in a compact 10 x 30 x 20 mm reinforced PMMA/ABS housing. These sensors are designed to detect PCBs despite large holes in the plates. Compact housing and high power LED for excellent performance size ...
Miniature sensor rangeRange: 200 mmSensitivity adjustment by potentiometerModulated, ...
Description:
Miniature sensor rangeRange: 200 mmSensitivity adjustment by potentiometerModulated, infrared light 850 nmSupply voltage: 10 to 30 VDCOutput: 100 mA, NPN or PNP presetMake and break switching functionLED indication for output, stability and power ONProtection: reverse polarity, short circuit and transientsCable ...
The PA18CAD10... is part of a family of ...
Description:
The PA18CAD10... is part of a family of inexpensive general purpose diffuse reflective sensors in industrial standard 18 mm cylindrical ABS housing. The sensors are useful in applications where high accuracy detection as well as small size is required. Compact ...