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. 695-6980
Mfr. Part No.XUVR0608PBNM8
SGD135.39
Each
units
Fork Through Beam 80 mm PNP 3-Pin M8 Connector - 24V - LED IP65, IP67 100 mA - - Polyamide
RS Stock No. 686-2227
Mfr. Part No.XUM5APCNL2
SGD138.96
Each
units
Block Diffuse 1 m PNP Cable - 24V - Infrared IP65, IP67 100 mA - 0.5 ms PBT
RS Stock No. 512-4662
Mfr. Part No.XUK5ARCNL2
SGD137.35
Each
units
Compact Diffuse 1 m Relay 5-Wire Cable 2m 240V 240V - Infrared IP65 3 A - <25 ms PBT
RS Stock No. 444-3619
Mfr. Part No.XUX0ARCTT16
SGD231.92
Each
units
Block Diffuse, Retro-Reflective, Through Beam (Receiver) 1.3 m, 2 m, 11 m, 40 m Relay Screw Clamp 240V 240V - Infrared IP65, IP67 3 A, 500 mA - <25 ms PBT
RS Stock No. 444-3518
Mfr. Part No.XUM0AKSAM8T
SGD85.05
Each
units
Block Through Beam (Emitter) 10 m Relay 4-Pin M8 Connector - 24V - Infrared IP67 100 mA - <2 ms PBT
RS Stock No. 444-3524
Mfr. Part No.XUK0AKSAL2
SGD165.40
Each
units
Compact Through Beam (Emitter) 0.28 m, 0.8 m, 4 m, 30 m PNP 3-Wire Cable 2m - 24V - Infrared IP65 100 mA - <2 ms PBT
RS Stock No. 695-6993
Mfr. Part No.XUVR1212PANM8
SGD162.09
Each
units
Fork Through Beam 120 mm PNP 3-Pin M8 Connector - 24V - LED IP65, IP67 100 mA - - Polyamide
RS Stock No. 609-0784
Mfr. Part No.XUB5APANM12
SGD91.41
Each
units
Barrel Diffuse 0.6 m PNP 4-Pin M12 Connector - 24V - Infrared IP65, IP67 100 mA - <1 ms PBT
RS Stock No. 444-3451
Mfr. Part No.XUB0BPSNM12
SGD141.86
Each
units
Barrel Diffuse, Retro-Reflective, Through Beam (Receiver) 0.12 m, 0.3 m, 2 m, 15 m PNP 4-Pin M12 Connector - 24V - Infrared IP65, IP67 100 mA - <2 ms Nickel Plated Brass
RS Stock No. 686-2211
Mfr. Part No.XUM2AKCNM8T
SGD84.58
Each
units
Block Through Beam (Emitter) 15 m Relay 4-Pin M8 Connector - 24V - LED IP65, IP67 100 mA - 0.5 ms PBT
RS Stock No. 455-4983
Mfr. Part No.XUK0ARCTL2
SGD181.10
Each
units
Compact Diffuse, Retro-Reflective, Through Beam (Receiver) 0.28 m, 0.8 m, 4 m, 30 m Relay Cable 240V 240V - Infrared IP65 3 A - <25 ms PBT
RS Stock No. 752-5231
Mfr. Part No.XUB1BPANL2
SGD90.28
Each
units
Barrel Retroreflective 4 m PNP Cable - 24V - Infrared IP65, IP67 100 mA - <1 ms Nickel Plated Brass
RS Stock No. 444-3495
Mfr. Part No.XUM0APSAM8
SGD143.73
Each
units
Block Multimode 0.1 m, 0.4 m, 3 m, 10 m PNP 4-Pin M8 Connector - 24V - Infrared IP65, IP67 100 mA - <2 ms PBT
RS Stock No. 752-5250
Mfr. Part No.XUBLAPCNM12
SGD450.10
Each
units
Barrel Through Beam (Emitter and Receiver) 100 m PNP M12 Connector - 24V - Laser Light IP67 100 mA - <0.4 ms PBT
RS Stock No. 753-0371
Mfr. Part No.XUVF250M12
SGD950.10
Each
units
Fork Through Beam 6 mm NPN/PNP 4-Pin M12 Connector - 24V - Infrared IP65 100 mA - <0.1 ms Polyamide
RS Stock No. 816-3714
Mfr. Part No.XUB9ANBNL2
SGD104.64
Each
units
Barrel Retroreflective 2 m NPN Wire Lead - 24V - LED IP65, IP67 100 mA - <1 ms Plastic
RS Stock No. 763-9380
Mfr. Part No.XUM8APCNM8
SGD172.51
Each
units
Block Background Suppression 300 mm PNP 4-Pin M8 Connector - 24V - LED IP67 100 mA - 1 ms -
RS Stock No. 695-6798
Mfr. Part No.XUB0ANSNL2
SGD163.81
Each
units
Barrel Multimode 0.12 m, 0.3 m, 2 m, 15 m NPN 3-Wire Cable 2m - 24V - Infrared IP65, IP67 100 mA - <2 ms PBT
RS Stock No. 394-8999
Mfr. Part No.XUK8AKSNM12
SGD234.26
Each
units
Compact Diffuse 1 m NPN/PNP 4-Pin M12 Connector - 24V - Infrared IP30, IP65 100 mA - <=2 ms PC
RS Stock No. 281-1537
Mfr. Part No.XU8M18MA230
SGD215.61
Each
units
Barrel Diffuse 0.12 m Relay 2-Wire Cable 2m 240V 240V - Infrared IP67 200 mA - <20 ms Nickel Plated Brass