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.


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รายละเอียดสินค้า / Description ราคา / Price Sensor Style Detection Type Detection Range Output Type Electrical Connection Maximum AC Voltage Communication Protocol Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface Response Time
RS Stock No. 903-3958
Brand :RS PRO
THB2,328.90
Each
Units
Fork Through Beam (Fork) 15 mm PNP Cable - - 30V Pre-Wired Infrared IP64 15 mA - <1 ms
ใหม่ / New
RS Stock No. 204-4008
Brand :RS PRO
THB1,160.92
Each
Units
Barrel Through Beam Reflection 20 m NPN NO+NC 2m PVC Cable - - 30V - LED IP67 - - <8.2 m/s
ใหม่ / New
RS Stock No. 204-3983
Brand :RS PRO
THB1,397.01
Each
Units
Barrel Retro Reflection 3 m PNP NO M12 Connector - - 30V - Yellow LED IP67 - - <8.2 m/s
RS Stock No. 729-5135
Brand :RS PRO
THB3,088.76
Each
Units
Block Diffuse 40 → 1000 mm NPN 4-Pin M12 Connector - - 30V - LED IP67 100 mA - <=2.5 ms
RS Stock No. 729-5110
Brand :RS PRO
THB2,554.97
Each
Units
Barrel Retroreflective 0.05 → 7 m NPN 4-Wire Cable 2m - - 30V - LED IP67 100 mA - <=0.5 ms
RS Stock No. 729-5094
Brand :RS PRO
THB2,522.47
Each
Units
Barrel Background Suppression 1 → 140 mm NPN 4-Wire Cable 2m - - 30V - LED IP67 100 mA - <=0.5 ms
ใหม่ / New
RS Stock No. 204-4001
Brand :RS PRO
THB918.73
Each
Units
Barrel Through Beam Reflection 10 m NPN NO+NC 2m PVC Cable - - 30V - LED IP67 - - <8.2 m/s
RS Stock No. 903-3945
Brand :RS PRO
THB2,328.90
Each
Units
Fork Through Beam (Fork) 7 mm PNP Cable - - 30V Pre-Wired Infrared IP64 15 mA - <1 ms
ใหม่ / New
RS Stock No. 204-3974
Brand :RS PRO
THB1,665.72
Each
Units
Barrel Diffuse Reflection 400 mm NPN NO+NC M12 Connector - - 30V - Yellow LED IP67 - - <8.2 m/s
ใหม่ / New
RS Stock No. 204-4014
Brand :RS PRO
THB2,212.26
Each
Units
Barrel Background Suppression 10 cm NPN NO+NC 2m PVC Cable - - 30V - LED IP67 - - <2 m/s
ใหม่ / New
RS Stock No. 204-3961
Brand :RS PRO
THB1,665.72
Each
Units
Barrel Diffuse Reflection 150 mm NPN NO 2m PVC Cable - - 30 Vdc - Yellow LED IP67 - - <8.2 m/s
RS Stock No. 729-5154
Brand :RS PRO
THB3,566.25
Each
Units
Block Retroreflective 0.15 → 10 m NPN Cable - - 30V - LED IP67 100 mA - 2.5 ms
ใหม่ / New
RS Stock No. 204-3990
Brand :RS PRO
THB612.20
Each
Units
Barrel Through Beam Reflection 5 m NPN NO 2m PVC Cable - - 30V - LED IP67 - - <8.2 m/s
ใหม่ / New
RS Stock No. 204-3978
Brand :RS PRO
THB1,531.80
Each
Units
Barrel Diffuse Reflection 100 cm NPN NO+NC 2m PVC Cable - - 30V - Yellow LED IP67 - - <8.2 m/s
ใหม่ / New
RS Stock No. 204-3970
Brand :RS PRO
THB1,598.32
Each
Units
Barrel Diffuse Reflection 400 mm NPN NO+NC M12 Connector - - 30V - Yellow LED IP67 - - <8.2 m/s
ใหม่ / New
RS Stock No. 204-3985
Brand :RS PRO
THB1,397.01
Each
Units
Barrel Retro Reflection 3 m PNP NO+NC 2m PVC Cable - - 30V - Yellow LED IP67 - - <8.2 m/s
ใหม่ / New
RS Stock No. 204-4009
Brand :RS PRO
THB1,160.92
Each
Units
Barrel Through Beam Reflection 20 m PNP NO+NC 2m PVC Cable - - 30V - LED IP67 - - <8.2 m/s
ใหม่ / New
RS Stock No. 204-3966
Brand :RS PRO
THB1,733.55
Each
Units
Barrel Diffuse Reflection 150 mm NPN NO 2m PVC Cable - - 30V - Yellow LED IP67 - - <8.2 m/s
RS Stock No. 729-5126
Brand :RS PRO
THB3,382.67
Each
Units
Barrel Through Beam (Emitter) 28 m NPN 4-Pin M12 Connector - - 30V - LED IP67 100 mA - <=0.5 ms
RS Stock No. 903-3927
Brand :RS PRO
THB2,576.45
Each
Units
Fork Through Beam (Fork) 30 mm NPN/PNP 4-Wire Cable 2m - - 30V Pre-Wired Infrared IP67 15 mA - <1 ms