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 Communication Protocol Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface Response Time
RS Stock No. 512-4656
Mfr. Part No.XUK9ARCNL2
TWD3,108.00
Each
units
Compact Retroreflective 5 m Relay 5-Wire Cable 2m 240V - 240V - LED IP65 3 A - <25 ms
RS Stock No. 609-0813
Mfr. Part No.XUX1ARCNT16
TWD5,115.00
Each
units
Block Retroreflective 14 m Relay 5-Terminal Screw 240V - 240V - Infrared IP65, IP67 3 A, 500 mA - <25 ms
RS Stock No. 763-9377
Mfr. Part No.XUM8APCNL2
TWD3,246.00
Each
units
Block Background Suppression 300 mm PNP Cable - - 24V - LED IP67 100 mA - 1 ms
RS Stock No. 753-0343
Mfr. Part No.XUK1APBNL2
TWD3,238.00
Each
units
Compact Retroreflective 7 m PNP 3-Wire Cable 2m - - 24V - Infrared IP65 100 mA - <2 ms
RS Stock No. 752-5216
Mfr. Part No.XUB1ANBNL2
TWD2,608.00
Each
units
Barrel Retroreflective 4 m NPN Cable - - 24V - Infrared IP65, IP67 100 mA - <1 ms
RS Stock No. 742-0795
Mfr. Part No.XUVE04M3NSNM8
TWD2,968.00
Each
units
Fork Through Beam 3 mm NPN 4-Pin M8 Connector - - 24V - Infrared IP65 100 mA - 50 μs
RS Stock No. 752-5155
Mfr. Part No.XUB9BNANM12
TWD2,923.00
Each
units
Barrel Retroreflective 2 m NPN 4-Pin M12 Connector - - 24V - LED IP65, IP67 100 mA - <1 ms
RS Stock No. 753-0274
Mfr. Part No.XUK2AKSNM12T
TWD1,639.00
Each
units
Compact Through Beam (Emitter) 30 m Solid State 4-Pin M12 Connector - - 24V - Infrared IP65 100 mA - <=2 ms
RS Stock No. 753-0353
Mfr. Part No.XUM0ANSAM8
TWD3,961.00
Each
units
Block Multimode 0.1 (Diffuse with Background Suppression) m, 0.4 (Diffuse) m, 3 (Polarised Reflex) m, 10 (Through Beam) m NPN 4-Pin M8 Connector - - 24V - Infrared IP65, IP67 100 mA - <2 ms
RS Stock No. 695-6839
Mfr. Part No.XUK5APANM12
TWD3,103.00
Each
units
Compact Diffuse 1 m PNP 4-Pin M12 Connector - - 24V - Infrared IP65 100 mA - <2 ms
RS Stock No. 752-5109
Mfr. Part No.XUB0BNSNM12
TWD2,923.00
Each
units
Barrel Multimode 0.12 (Diffuse with Background Suppression) m, 0.3 (Diffuse) m, 2 (Polarised Reflex) m, 15 (Through Beam) m NPN 4-Pin M12 Connector - - 24V - Infrared IP65, IP67 100 mA - <2 ms
RS Stock No. 753-0479
Mfr. Part No.XUX1ANANT16
TWD3,957.00
Each
units
Block Retroreflective 14 m NPN 3-Terminal Screw - - 24V - Infrared IP65, IP67 100 mA - <2 ms
RS Stock No. 763-9380
Mfr. Part No.XUM8APCNM8
TWD4,677.00
Each
units
Block Background Suppression 300 mm PNP 4-Pin M8 Connector - - 24V - LED IP67 100 mA - 1 ms
RS Stock No. 752-5161
Mfr. Part No.XUB2ANANL2R
TWD1,670.00
Each
units
Barrel Through Beam (Receiver) 15 m NPN Cable - - 24V - Infrared IP65, IP67 100 mA - <1 ms
RS Stock No. 753-0413
Mfr. Part No.XUX9APANM12
TWD3,751.00
Each
units
Block Retroreflective 11 m PNP 4-Pin M12 Connector - - 24V - LED IP65, IP67 100 mA - <2 ms
RS Stock No. 189-2156
Mfr. Part No.XUM9APSBL2
TWD1,889.00
Each
units
Miniature Polarised Reflex 5 m PNP Cable - - 24 V, 26.4 V Cable LED IP67 14 mA - 1 ms
RS Stock No. 753-0283
Mfr. Part No.XUK2ARCNL2T
TWD2,059.00
Each
units
Compact Through Beam (Emitter) 30 m Solid State 2-Wire Cable 2m 240V - 240V - Infrared IP65 3 A - <25 ms
RS Stock No. 753-0359
Mfr. Part No.XUK1APBNM12
TWD3,080.00
Each
units
Compact Retroreflective 7 m PNP 4-Pin M12 Connector - - 24V - Infrared IP65 100 mA - <2 ms
RS Stock No. 695-6842
Mfr. Part No.XUX2ARCNT16R
TWD4,182.00
Each
units
Block Through Beam (Receiver) 40 m Relay 5-Terminal Screw 240V - 240V - Infrared IP65, IP67 3 A, 500 mA - <25 ms
RS Stock No. 444-3568
Mfr. Part No.XUX0AKSAM12
TWD5,969.00
Each
units
Block Multimode 1.3 m, 2 m, 11 m, 40 m NPN/PNP 4-Pin M12 Connector - - 24V - Infrared IP65, IP67 100 mA - <2 ms