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 56 products
Results per page
Description 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. 814-0361
Mfr. Part No.OID200
HK$1,478.99
Each
units
Barrel Background Suppression 0.03 → 2 m NPN/PNP M12 Connector - IO-LINK 30V Wire Lead LED IP65, IP67 <75 mA @ 24 V dc IO-Link -
RS Stock No. 739-6664
Mfr. Part No.OJ5052
HK$1,588.22
Each
units
Block Diffuse 15 → 200 mm PNP 4-Pin M8 Connector - - 30V - LED IP67 200 mA - -
RS Stock No. 191-9933
Mfr. Part No.OF5012
HK$1,212.00
Each
units
Barrel Diffuse 1 200 mm PNP M12 Connector - - 36V - Infrared IP65 200 mA - -
RS Stock No. 191-9949
Mfr. Part No.OF5027
HK$1,154.43
Each
units
Barrel Diffuse 1 → 400 mm PNP M12 Connector - - 36V - Infrared IP65 200 mA - -
RS Stock No. 191-9911
Mfr. Part No.OF5014
HK$1,010.00
Each
units
Barrel Retroreflective 0.05 → 2 m PNP Cable - - 36V - Infrared IP67 200 mA - -
RS Stock No. 739-6673
Mfr. Part No.O1D100
HK$3,150.48
Each
units
Block Diffuse 0.2 → 10 m Analogue, PNP M12 Connector - - 30V - Laser Light IP67 200 mA - -
RS Stock No. 144-3584
Mfr. Part No.O8E200
HK$750.69
Each
units
Block Through Beam (Receiver) <3 m PNP Cable - IO-LINK 30V Cable LED IP65, IP67 15 mA IO-Link -
RS Stock No. 488-132
Mfr. Part No.O5P200
HK$1,227.82
Each
units
Block Retroreflective 0.1 7 m PNP M12 Connector - - 36V - LED IP67 200 mA - -
RS Stock No. 739-6651
Mfr. Part No.OF5016
HK$1,036.26
Each
units
Barrel Retroreflective 0.05 → 2 m PNP M12 Connector - - 36V - Infrared IP65 200 mA - -
RS Stock No. 739-6639
Mfr. Part No.O4P500
HK$1,090.80
Each
units
Block Retroreflective 0.3 → 22 m PNP M12 Connector - - 36V - LED IP67 200 mA - -
RS Stock No. 425-8001
Mfr. Part No.OJ5009
HK$771.47
Each
units
Block Through Beam (Receiver) 10 m PNP M8 Connector - - 30V - LED IP67 200 mA - -
RS Stock No. 488-138
Mfr. Part No.O5S200
HK$838.30
Each
units
Block Through Beam (Emitter) 20 m - M12 Connector - - 36V - LED IP67 200 mA - -
RS Stock No. 487-898
Mfr. Part No.O1D106
HK$4,006.32
Each
units
Block Background Suppression 1 75 m PNP M12 Connector - - 30V - Laser Light IP67 200 mA - -
RS Stock No. 144-3585
Mfr. Part No.O8P200
HK$923.34
Each
units
Block Retroreflective 20 → 1800 mm PNP Cable - IO-LINK 30V Cable LED IP65, IP67 20 mA IO-Link -
RS Stock No. 144-3587
Mfr. Part No.O8E202
HK$750.69
Each
units
Block Through Beam (Receiver) <3 m PNP M8 Connector - IO-LINK 30V M8 Connector LED IP65, IP67 15 mA IO-Link -
RS Stock No. 425-8130
Mfr. Part No.OJ5004
HK$1,130.89
Each
units
Block Retroreflective 2 m PNP M8 Connector - - 30V - LED IP67 200 mA - -
RS Stock No. 488-148
Mfr. Part No.O5E200
HK$989.80
Each
units
Block Through Beam (Receiver) 20 m PNP M12 Connector - - 36V - LED IP67 200 mA - -
RS Stock No. 739-6648
Mfr. Part No.OF5010
HK$1,060.50
Each
units
Barrel Diffuse 1 → 200 mm PNP Cable - - 36V - Infrared IP67 200 mA - -
RS Stock No. 425-8382
Mfr. Part No.OJ5039
HK$708.41
Each
units
Block Through Beam (Receiver) 15 m PNP M8 Connector - - 30V - LED IP67 200 mA - -
RS Stock No. 425-8398
Mfr. Part No.OJ5038
HK$1,148.98
Each
units
Block Through Beam (Emitter) 15 m PNP M8 Connector - - 30V - LED IP67 200 mA - -