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 455-4983
製造零件編號XUK0ARCTL2
HK$1,415.70
單位
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
RS庫存編號 800-4031
製造零件編號OD1-B100H50I14
BrandSick
HK$10,225.76
單位
Block Background Suppression 50 → 150 mm Analogue 4-Pin M8 Connector - - 24V - Laser Light IP67 20 mA - 2 ms, 4 ms, 8 ms, 16 ms
RS庫存編號 609-9056
製造零件編號EQ511
BrandPanasonic
HK$1,816.24
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 778-8700
製造零件編號E3JK-DR12 2M
BrandOmron
HK$904.33
單位
Block Diffuse 300 mm Relay 5-Wire Cable 2m 240V - 240V Wire Lead LED IP64 - - 20 ms
RS庫存編號 256-411
BrandRS PRO
HK$910.07
單位
Barrel Retroreflective 4 m NPN/PNP M12 Connector - - 30V - Infrared IP67 100 mA - 6 ms
RS庫存編號 444-3401
製造零件編號XUB0APSNM12
HK$758.73
單位
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
RS庫存編號 444-3619
製造零件編號XUX0ARCTT16
HK$1,146.68
單位
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
RS庫存編號 444-3530
製造零件編號XUK0AKSAM12
HK$974.61
單位
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
RS庫存編號 768-9461
製造零件編號WL9-3P2430
BrandSick
HK$1,214.49
單位
Block Retroreflective 0 → 4 m PNP 4-Pin M12 Connector - - 30V - LED IP66, IP67, IP69K 100 mA - <0.5 ms
RS庫存編號 256-433
製造零件編號E3JMR4M4G
BrandOmron
HK$1,776.84
單位
Block Retro-Reflective 4 m Relay Terminal Block 250V - 5V - LED IP66 3 A - 30 ms
RS庫存編號 493-7316
製造零件編號WF2-40B410
BrandSick
HK$1,676.56
單位
Fork Through Beam (Fork) 2 mm NPN/PNP 4-Pin M8 Connector - - 30V - Infrared IP65 100 mA - 100 μs
RS庫存編號 219-2274
製造零件編號EE-SX670
BrandOmron
HK$278.79
單位
Fork Through Beam (Fork) 5 mm NPN Connector - - 24V - Infrared IP50 100 mA - -
RS庫存編號 219-005
製造零件編號DT20-P214B
BrandSick
HK$7,555.32
單位
Block Background Suppression 100 → 600 mm Analogue 5-Pin M12 Connector - - 30V - Laser Light IP65 100 mA - 2.8 ms
RS庫存編號 814-0361
製造零件編號OID200
HK$1,478.99
單位
Barrel Background Suppression 30 mm → 2 m NPN/PNP M12 Connector - IO-LINK 30V Wire Lead LED IP65, IP67 <75 mA IO-Link -
RS庫存編號 157-7062
製造零件編號E3JMR4M4TG
BrandOmron
HK$1,474.72
單位
Block Retroreflective 4 m Relay 5-Terminal Screw 250V - 5V - LED IP66 3 A - 30 ms
RS庫存編號 778-8707
製造零件編號E3JK-DR11 2M
BrandOmron
HK$908.64
單位
Block Diffuse 2.5 m Relay 5-Wire Cable 2m 240V - 240V Wire Lead LED IP64 - - 20 ms
RS庫存編號 288-9805
製造零件編號WT150-P460
BrandSick
HK$1,492.76
單位
Block Diffuse 2 → 100 mm PNP 4-Pin M8 Connector - - 30V - LED IP67 100 mA - <=0.5 ms
RS庫存編號 450-2954
製造零件編號OBT200-18GM60-E5-V1
HK$848.23
單位
Barrel Diffuse 200 mm PNP 4-Pin M12 Connector - - 30V - Infrared IP67 100 mA - <=1 ms
RS庫存編號 817-1557
製造零件編號RL31-8-1200-RT/73c/136
HK$625.69
單位
Block Diffuse 1.2 m Push Pull 4-Pin M12 Connector - - 30V - LED IP67 100 mA - <=1 ms
RS庫存編號 374-2072
製造零件編號E3ZD822MOMS
BrandOmron
HK$1,005.00
單位
Block Diffuse 1 m PNP 3-Wire Cable 2m - - 26.4V - Infrared IP69K 100 mA - 1 ms