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. 609-9056
Mfr. Part No.EQ511
BrandPanasonic
HK$1,762.99
Each
units
Block Diffuse 0.1 → 2.5 m PNP Terminal Block - 24V Screw Infrared IP67 100 mA - 2 ms ABS
RS Stock No. 877-7405
Mfr. Part No.HG-C1050
BrandPanasonic
HK$3,145.80
Each
units
Block Background Suppression 50 mm NPN Cable - 24V - Laser Light IP67 - - 1.5 (High Speed) ms, 5 (Standard) ms, 10 (High Precision) ms Acrylic (Front cover), Aluminum Die Cast
RS Stock No. 812-8213
Mfr. Part No.CY-192A-P-Z-Y
BrandPanasonic
HK$253.42
Each
units
Barrel Retroreflective 4 m PNP M12 Connector - 24V - Infrared IP67 35 mA - 1 ms PBT
RS Stock No. 361-5510
Mfr. Part No.EX-13A-PN
BrandPanasonic
HK$1,028.50
Each
units
Block Through Beam (Emitter and Receiver) 500 mm PNP 3-Wire Cable 2m - 24V - LED IP67 50 mA - <=0.5 ms PET
RS Stock No. 609-9731
Mfr. Part No.EQ512
BrandPanasonic
HK$1,350.00
Each
units
Block Diffuse 0.1 → 1 m PNP 4-Terminal Screw - 24V Screw Infrared IP67 100 mA - 2 ms ABS
RS Stock No. 812-8226
Mfr. Part No.CX-442-P-Z
BrandPanasonic
HK$976.55
Each
units
Block Diffuse 800 mm PNP 4-Pin M8 Connector - 24V - LED IP67 20 mA - 1 ms PBT
RS Stock No. 361-5554
Mfr. Part No.EX-14A-PN
BrandPanasonic
HK$768.70
Each
units
Block Retroreflective 2 → 25 mm PNP 3-Wire Cable 2m - 24V - LED IP67 50 mA - <=0.5 ms PET
RS Stock No. 609-9062
Mfr. Part No.EQ511T
BrandPanasonic
HK$1,674.00
Each
units
Block Diffuse 0.1 → 2.5 m PNP 4-Terminal Screw - 24V Screw Infrared IP67 100 mA - 2 ms ABS
RS Stock No. 361-5655
Mfr. Part No.EX-23-PN
BrandPanasonic
HK$1,385.50
Each
units
Block Through Beam (Emitter and Receiver) 2 m PNP 3-Wire Cable 2m - 24V - LED IP67 50 mA - <=0.5 ms PET
RS Stock No. 431-2509
Mfr. Part No.NX5PRVM5A
BrandPanasonic
HK$846.00
Each
units
Block Retroreflective 0.1 → 5 m Relay Cable 250V 30V - LED IP66 - - <=10 ms PC
RS Stock No. 361-5532
Mfr. Part No.EX-13EA-PN
BrandPanasonic
HK$863.85
Each
units
Block Through Beam (Emitter and Receiver) 500 mm PNP 3-Wire Cable 2m - 24V - LED IP67 50 mA - <=0.5 ms PET
RS Stock No. 901-2910
Mfr. Part No.EX-11A-PN
BrandPanasonic
HK$991.22
Each
units
Block Through Beam (Emitter and Receiver) Maximum of 150 mm PNP Cable - 24V Wire Lead LED IP67 10 mA - 0.5 ms PET
RS Stock No. 125-4556
Mfr. Part No.PM-R45-C3
BrandPanasonic
HK$244.66
Each
units
Fork Through Beam (Fork) 6 mm NPN 3m Cable - 24V Cable Infrared IP64 50 (Sink Current) mA - 20 (Received) μs, 80 (Interrupted) μs PBT (Enclosure), Polycarbonate (Display Section)
RS Stock No. 125-4571
Mfr. Part No.PM-F65W
BrandPanasonic
HK$168.98
Each
units
Fork Through Beam (Fork) 6 mm NPN 4-Pin Connector - 24V 4-Pin Connector Infrared IP40 50 (Sink Current) mA - 20 (Received) μs, 80 (Interrupted) μs PBT (Enclosure), Polycarbonate (Display Section)
RS Stock No. 125-4557
Mfr. Part No.PM-R45-P
BrandPanasonic
HK$185.53
Each
units
Fork Through Beam (Fork) 6 mm PNP 1m Cable - 24V Cable Infrared IP64 50 (Source Current) mA - 20 (Received) μs, 80 (Interrupted) μs PBT (Enclosure), Polycarbonate (Display Section)
RS Stock No. 901-2863
Mfr. Part No.CX-491-Y
BrandPanasonic
HK$783.92
Each
units
Block Retroreflective Maximum of 3 m NPN 2m Cable - 24V - LED IP67 - - 1 ms PBT
RS Stock No. 125-4566
Mfr. Part No.PM-L65-P
BrandPanasonic
HK$164.63
Each
units
Fork Through Beam (Fork) 6 mm PNP 4-Pin Connector - 24V 4-Pin Connector Infrared IP40 50 (Source Current) mA - 20 (Received) μs, 80 (Interrupted) μs PBT (Enclosure), Polycarbonate (Display Section)
RS Stock No. 125-4572
Mfr. Part No.PM-F65W-P
BrandPanasonic
HK$168.98
Each
units
Fork Through Beam (Fork) 6 mm PNP 4-Pin Connector - 24V 4-Pin Connector Infrared IP40 50 (Source Current) mA - 20 (Received) μs, 80 (Interrupted) μs PBT (Enclosure), Polycarbonate (Display Section)
RS Stock No. 125-4558
Mfr. Part No.PM-R45-P-C3
BrandPanasonic
HK$244.66
Each
units
Fork Through Beam (Fork) 6 mm PNP 3m Cable - 24V Cable Infrared IP64 50 (Source Current) mA - 20 (Received) μs, 80 (Interrupted) μs PBT (Enclosure), Polycarbonate (Display Section)
RS Stock No. 125-4567
Mfr. Part No.PM-Y65
BrandPanasonic
HK$168.98
Each
units
Fork Through Beam (Fork) 6 mm NPN 4-Pin Connector - 24V 4-Pin Connector Infrared IP40 50 (Sink Current) mA - 20 (Received) μs, 80 (Interrupted) μs PBT (Enclosure), Polycarbonate (Display Section)