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. 455-4983
Mfr. Part No.XUK0ARCTL2
HK$1,295.57
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. 444-3401
Mfr. Part No.XUB0APSNM12
HK$722.19
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 PBT
RS Stock No. 444-3619
Mfr. Part No.XUX0ARCTT16
HK$1,146.68
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. 444-3530
Mfr. Part No.XUK0AKSAM12
HK$955.50
Each
units
Compact Through Beam (Emitter) 0.28 m, 0.8 m, 4 m, 30 m PNP 4-Pin M12 Connector - 24V - Infrared IP65 100 mA - <2 ms PBT
RS Stock No. 686-2205
Mfr. Part No.XUM9APCNL2
HK$779.76
Each
units
Block Retroreflective 2 m PNP 3-Wire Cable 2m - 24V - LED IP65, IP67 100 mA - 0.5 ms PBT
RS Stock No. 752-5060
Mfr. Part No.XUB2AKSNM12T
HK$310.01
Each
units
Barrel Through Beam (Emitter) 15 m Solid State 4-Pin M12 Connector - 24V - Infrared IP65, IP67 100 mA - <1 ms PBT
RS Stock No. 444-3417
Mfr. Part No.XUB0AKSNL2T
HK$470.40
Each
units
Barrel Through Beam (Emitter) 15 m - 3-Wire Cable 2m - 24V - Infrared IP65, IP67 100 mA - <2 ms PBT
RS Stock No. 444-3394
Mfr. Part No.XUB0APSNL2
HK$724.50
Each
units
Barrel Diffuse, Retro-Reflective, Through Beam (Receiver) 0.12 m, 0.3 m, 2 m, 15 m PNP Cable - 24V - Infrared IP65, IP67 100 mA - <2 ms PBT
RS Stock No. 512-4656
Mfr. Part No.XUK9ARCNL2
HK$787.90
Each
units
Compact Retroreflective 5 m Relay 5-Wire Cable 2m 240V 240V - LED IP65 3 A - <25 ms PBT
RS Stock No. 512-4662
Mfr. Part No.XUK5ARCNL2
HK$923.26
Each
units
Compact Diffuse 1 m Relay 5-Wire Cable 2m 240V 240V - Infrared IP65 3 A - <25 ms PBT
RS Stock No. 512-4640
Mfr. Part No.XUK1ARCNL2
HK$819.97
Each
units
Compact Retro-Reflective 7 m Relay Cable 240V 240V - Infrared IP65 3 A - <25 ms PBT
RS Stock No. 695-6814
Mfr. Part No.XUB2BKSNM12T
HK$357.63
Each
units
Barrel Through Beam (Emitter) 15 m Relay 4-Pin M12 Connector - 24V - Infrared IP65, IP67 100 mA - <1 ms Nickel Plated Brass
RS Stock No. 444-3625
Mfr. Part No.XUX0ARCTT16T
HK$669.55
Each
units
Block Through Beam (Emitter) 40 m - 3-Terminal Screw 240V 240V - Infrared IP65, IP67 3 A, 500 mA - <25 ms PBT
RS Stock No. 444-3524
Mfr. Part No.XUK0AKSAL2
HK$884.74
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. 878-7948
Mfr. Part No.XUK1ARCNL2H60
HK$1,391.37
Each
units
Compact Retroreflective Maximum of 10 m Relay 5-Wire Cable 2m 240V 240V Cable LED IP65 3 A - - PBT
RS Stock No. 752-5073
Mfr. Part No.XUB0BKSWL2T
HK$398.00
Each
units
Barrel Through Beam (Emitter) 10 m Solid State Cable - 24V - Infrared IP65, IP67 100 mA - <2 ms Nickel Plated Brass
RS Stock No. 816-3673
Mfr. Part No.XU5M18MA230K
HK$913.38
Each
units
Block Diffuse 0.4 m Solid State 1/2 in-20 UNF Connector 240V 240V Screw LED IP67 200 mA - <1 ms Metal
RS Stock No. 752-5133
Mfr. Part No.XUB9BPANL2
HK$584.49
Each
units
Barrel Retroreflective 2 m PNP Cable - 24V - LED IP65, IP67 100 mA - <1 ms Nickel Plated Brass
RS Stock No. 444-3552
Mfr. Part No.XUK0AKSAM12T
HK$455.00
Each
units
Compact Through Beam (Emitter) 30 m - 4-Pin M12 Connector - 24V - Infrared IP65 100 mA - <=2 ms PBT
RS Stock No. 753-0343
Mfr. Part No.XUK1APBNL2
HK$650.00
Each
units
Compact Retroreflective 7 m PNP 3-Wire Cable 2m - 24V - Infrared IP65 100 mA - <2 ms PBT