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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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. 512-4656
Mfr. Part No.XUK9ARCNL2
TWD2,490.00
Each
units
Compact Retroreflective 5 m Relay 5-Wire Cable 2m 240V 240V - LED IP65 3 A - <25 ms PBT
RS Stock No. 609-0813
Mfr. Part No.XUX1ARCNT16
TWD4,240.00
Each
units
Block Retroreflective 14 m Relay 5-Terminal Screw 240V 240V - Infrared IP65, IP67 3 A, 500 mA - <25 ms PBT
RS Stock No. 753-0387
Mfr. Part No.XUX5APANM12
TWD3,410.00
Each
units
Block Diffuse 2.1 m PNP 4-Pin M12 Connector - 24V - Infrared IP65, IP67 100 mA - <2 ms PBT
RS Stock No. 609-0778
Mfr. Part No.XUB5APANL2
TWD2,612.00
Each
units
Barrel Diffuse 0.6 m PNP Cable - 24V - Infrared IP65, IP67 100 mA - <1 ms PBT
RS Stock No. 182-9173
Mfr. Part No.XUK8TAE1MM12
TWD12,474.00
Each
units
Compact Background Suppression 0 5 m PNP 5-Wire Cable - 30V M12 Connector LED IP67, IP69K 60 mA - <1.2 ms ABS, PC
RS Stock No. 816-7552
Mfr. Part No.XUM5ANCNM8
TWD3,087.00
Each
units
Block Diffuse 1 m NPN 4-Pin M8 Connector - 30V Screw LED IP67 200 mA - <1 ms Plastic
RS Stock No. 752-5124
Mfr. Part No.XUB9APANL2
TWD1,960.00
Each
units
Barrel Retroreflective 2 m PNP Cable - 24V - LED IP65, IP67 100 mA - <1 ms PBT
RS Stock No. 695-6980
Mfr. Part No.XUVR0608PBNM8
TWD3,722.00
Each
units
Fork Through Beam 80 mm PNP 3-Pin M8 Connector - 24V - LED IP65, IP67 100 mA - - Polyamide
RS Stock No. 753-0397
Mfr. Part No.XUX5APANT16
TWD3,410.00
Each
units
Block Diffuse 2.1 m PNP 3-Terminal Screw - 24V - Infrared IP65, IP67 100 mA - <2 ms PBT
RS Stock No. 752-5234
Mfr. Part No.XUB1ANANM12
TWD1,780.00
Each
units
Barrel Retroreflective 4 m NPN 4-Pin M12 Connector - 24V - Infrared IP65, IP67 100 mA - <1 ms PBT
RS Stock No. 444-3467
Mfr. Part No.XUB0BKSNL2T
TWD2,050.00
Each
units
Barrel Through Beam (Emitter) 15 m - Cable - 24V - Infrared IP65, IP67 100 mA - <2 ms Nickel Plated Brass
RS Stock No. 816-3685
Mfr. Part No.XUFZ06
TWD2,691.00
Each
units
Barrel - - - - - - - - - - - - -
RS Stock No. 695-6993
Mfr. Part No.XUVR1212PANM8
TWD4,613.00
Each
units
Fork Through Beam 120 mm PNP 3-Pin M8 Connector - 24V - LED IP65, IP67 100 mA - - Polyamide
RS Stock No. 752-5247
Mfr. Part No.XUB1APBNM12
TWD1,800.00
Each
units
Barrel Retroreflective 4 m PNP 4-Pin M12 Connector - 24V - Infrared IP65, IP67 100 mA - <1 ms PBT
RS Stock No. 189-2143
Mfr. Part No.XUM2ANSBM8
TWD4,078.00
Each
units
Miniature Through Beam 15 m NPN 4 Pin Male Connector M8 - 24 V, 26.4 V 4 Pin Male Connector M8 LED IP67 25 mA - 1 ms Plastic
RS Stock No. 182-9174
Mfr. Part No.XUK8TAE2MM12
TWD12,474.00
Each
units
Compact Background Suppression 0 5 m PNP 5-Wire Cable - 30V M12 Connector LED IP67, IP69K 60 mA - <1.2 ms ABS, PC
RS Stock No. 444-3417
Mfr. Part No.XUB0AKSNL2T
TWD1,934.00
Each
units
Barrel Through Beam (Emitter) 15 m - 3-Wire Cable 2m - 24V - Infrared IP65, IP67 100 mA - <2 ms PBT
RS Stock No. 512-4640
Mfr. Part No.XUK1ARCNL2
TWD2,270.00
Each
units
Compact Retro-Reflective 7 m Relay Cable 240V 240V - Infrared IP65 3 A - <25 ms PBT
RS Stock No. 752-5143
Mfr. Part No.XUB9APANM12
TWD1,960.00
Each
units
Barrel Retroreflective 2 m PNP 4-Pin M12 Connector - 24V - LED IP65, IP67 100 mA - <1 ms PBT
RS Stock No. 609-0784
Mfr. Part No.XUB5APANM12
TWD2,612.00
Each
units
Barrel Diffuse 0.6 m PNP 4-Pin M12 Connector - 24V - Infrared IP65, IP67 100 mA - <1 ms PBT