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庫存編號 609-9056
製造零件編號EQ511
BrandPanasonic
HK$1,777.19
單位
Block Diffuse 0.1 → 2.5 m PNP Terminal Block - - 24V Screw Infrared IP67 100 mA - 2 ms
RS庫存編號 877-7405
製造零件編號HG-C1050
BrandPanasonic
HK$3,279.26
單位
Block Background Suppression 50 mm NPN Cable - - 24V - Laser Light IP67 - - 1.5 (High Speed) ms, 5 (Standard) ms, 10 (High Precision) ms
RS庫存編號 609-9062
製造零件編號EQ511T
BrandPanasonic
HK$1,398.00
單位
Block Diffuse 0.1 → 2.5 m PNP 4-Terminal Screw - - 24V Screw Infrared IP67 100 mA - 2 ms
RS庫存編號 361-5532
製造零件編號EX-13EA-PN
BrandPanasonic
HK$863.85
單位
Block Through Beam (Emitter and Receiver) 500 mm PNP 3-Wire Cable 2m - - 24V - LED IP67 50 mA - <=0.5 ms
RS庫存編號 812-8226
製造零件編號CX-442-P-Z
BrandPanasonic
HK$884.97
單位
Block Diffuse 800 mm PNP 4-Pin M8 Connector - - 24V - LED IP67 20 mA - 1 ms
RS庫存編號 812-8213
製造零件編號CY-192A-P-Z-Y
BrandPanasonic
HK$287.01
單位
Barrel Retroreflective 4 m PNP M12 Connector - - 24V - Infrared IP67 35 mA - 1 ms
RS庫存編號 361-5655
製造零件編號EX-23-PN
BrandPanasonic
HK$1,375.09
單位
Block Through Beam (Emitter and Receiver) 2 m PNP 3-Wire Cable 2m - - 24V - LED IP67 50 mA - <=0.5 ms
RS庫存編號 361-5554
製造零件編號EX-14A-PN
BrandPanasonic
HK$987.15
單位
Block Retroreflective 2 → 25 mm PNP 3-Wire Cable 2m - - 24V - LED IP67 50 mA - <=0.5 ms
RS庫存編號 901-2910
製造零件編號EX-11A-PN
BrandPanasonic
HK$707.96
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Block Through Beam (Emitter and Receiver) 150 mm PNP Cable - - 24V Wire Lead LED IP67 10 mA - 0.5 ms
RS庫存編號 361-5510
製造零件編號EX-13A-PN
BrandPanasonic
HK$1,020.33
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Block Through Beam (Emitter and Receiver) 500 mm PNP 3-Wire Cable 2m - - 24V - LED IP67 50 mA - <=0.5 ms
RS庫存編號 431-2509
製造零件編號NX5PRVM5A
BrandPanasonic
HK$846.00
單位
Block Retroreflective 0.1 → 5 m Relay Cable 250V - 30V - LED IP66 - - <=10 ms
RS庫存編號 609-9731
製造零件編號EQ512
BrandPanasonic
HK$1,350.00
單位
Block Diffuse 0.1 → 1 m PNP 4-Terminal Screw - - 24V Screw Infrared IP67 100 mA - 2 ms
RS庫存編號 136-5661
製造零件編號EX-Z11A-P
BrandPanasonic
HK$816.85
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Block Through Beam (Emitter and Receiver) 50 mm PNP Cable - - 24V Wire Lead LED IP67 20 mA - 0.5 ms
RS庫存編號 136-5662
製造零件編號EX-Z11B-P
BrandPanasonic
HK$816.85
單位
Block Through Beam (Emitter and Receiver) 50 mm PNP Cable - - 24V Wire Lead LED IP67 20 mA - 0.5 ms
RS庫存編號 361-5526
製造零件編號EX-13B-PN
BrandPanasonic
HK$1,020.33
單位
Block Through Beam (Emitter and Receiver) 500 mm PNP 3-Wire Cable 2m - - 24V - LED IP67 50 mA - <=0.5 ms
RS庫存編號 136-5663
製造零件編號EX-Z12A-P
BrandPanasonic
HK$816.85
單位
Block Through Beam (Emitter and Receiver) 200 mm PNP Cable - - 24V Wire Lead LED IP67 20 mA - 0.5 ms
RS庫存編號 480-5039
製造零件編號EQ501T
BrandPanasonic
HK$1,703.33
單位
Block Diffuse 0.1 → 2.5 m Relay 4-Terminal Screw 250V - 30V Screw Infrared IP67 3 A - <=20 ms
RS庫存編號 136-5657
製造零件編號EX-Z12FA-P
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Block Through Beam (Emitter and Receiver) 200 mm PNP Cable - - 24V Wire Lead LED IP67 20 mA - 0.5 ms
RS庫存編號 136-5664
製造零件編號EX-Z12B-P
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Block Through Beam (Emitter and Receiver) 200 mm PNP Cable - - 24V Wire Lead LED IP67 20 mA - 0.5 ms
RS庫存編號 125-4567
製造零件編號PM-Y65
BrandPanasonic
HK$167.47
單位
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