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.RS Components offer an extensive selection of photoelectric sensors for use various industrial applications. Our high-quality products are supplied from leading brands including Omron, Sick, Pepperl + Fuchs Telemecanique Sensors Baumer, Banner and of course RS PRO.

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 can detect 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 must 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 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.


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Description Price Sensor Style Detection Type Detection Range Output Type Electrical Connection Switching Mode Maximum AC Voltage Communication Protocol Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface
RS庫存編號 111-3700
製造零件編號WLG4SC-3P2232A71
BrandSick
HK$1,859.22
單位
Block Retroreflective 0 → 5 m PNP 4-Pin M8 Connector - - IO-LINK 30V 4-Pin M8 Connector LED IP66, IP67 100 mA IO-Link
RS庫存編號 361-5655
製造零件編號EX-23-PN
BrandPanasonic
HK$1,397.70
單位
Block Through Beam (Emitter and Receiver) 2 m PNP 3-Wire Cable 2m - - - 24V - LED IP67 50 mA -
RS庫存編號 701-8803
製造零件編號WLG4S-3P2232V
BrandSick
HK$2,053.45
單位
Block Retroreflective 5 m PNP 4-Pin M8 Connector - - - 30V - LED IP69K 100 mA -
RS庫存編號 121-2722
製造零件編號WTB11-2P2461
BrandSick
HK$1,359.09
單位
Block Background Suppression 30 mm → 1.1 m PNP 4-Pin M12 Connector - - - 30V M12 LED IP66, IP67, IP69K 30 mA -
RS庫存編號 219-033
製造零件編號DT20-P254B
BrandSick
HK$7,643.27
單位
Block Background Suppression 50 → 150 mm PNP 5-Pin M12 Connector - - - 30V - Laser Light IP65 100 mA -
RS庫存編號 901-2910
製造零件編號EX-11A-PN
BrandPanasonic
HK$715.04
單位
Block Through Beam (Emitter and Receiver) 150 mm PNP Cable - - - 24V Wire Lead LED IP67 10 mA -
RS庫存編號 191-9933
製造零件編號OF5012
HK$1,212.00
單位
Barrel Diffuse 1 → 200 mm PNP M12 Connector - - - 36V - Infrared IP65 200 mA -
RS庫存編號 191-9911
製造零件編號OF5014
HK$1,010.00
單位
Barrel Retroreflective 0.05 → 2 m PNP Cable - - - 36V - Infrared IP67 200 mA -
RS庫存編號 831-5978
製造零件編號E3S-DBP21T OMS
BrandOmron
HK$1,225.60
單位
Block Retroreflective 0 → 4.5 m PNP 4-Pin M12 Connector - - - 30V Cable LED IP67, IP69 100 mA -
RS庫存編號 859-3005
製造零件編號S142ARNN924
HK$3,185.60
單位
Block - - NPN/PNP - - 24V - 24V - LED IP20 - -
RS庫存編號 463-8801
製造零件編號VL12-2P132
BrandSick
HK$933.04
單位
Barrel Retroreflective 0.03 → 2.8 m PNP 4-Wire Cable 2m - - - 30V - LED IP67 100 mA -
全新
RS庫存編號 205-4828
製造零件編號GRL18SG-P1157
BrandSick
HK$742.57
單位
Barrel Retro Reflective 7.2 m PNP Cable - - - 30V 4-pin PinPoint LED IP67 - -
RS庫存編號 842-2865
製造零件編號Q10AP6DQ
BrandBanner
HK$1,534.44
單位
Block Diffuse 500 mm PNP Cable - - - 30V - LED IP67 20 mA -
全新
RS庫存編號 211-1613
製造零件編號GRTE18-P2462
BrandSick
HK$748.04
單位
Cylindrical Energetic 800 - 1000 mm Light/Dark Switching, PNP Male Connector M12 - - - 30V 4-Pin - IP67 100 mA -
RS庫存編號 431-1764
製造零件編號NX5M30A
BrandPanasonic
HK$1,496.89
單位
Block Through Beam (Emitter and Receiver) 30 m Relay 3-Wire Cable 2m - 250V - 30V - Infrared IP66 - -
RS庫存編號 847-9520
製造零件編號QS30LD
BrandBanner
HK$2,046.86
單位
Block Diffuse 400 mm NPN/PNP Cable - - - 30V - Laser Light IP67 35 mA -
RS庫存編號 768-5936
製造零件編號E3FADP23
BrandOmron
HK$667.87
單位
Barrel Diffuse 1 m PNP 4-Pin M12 Connector - - - 30V - LED IP67, IP69K 25 mA -
全新
RS庫存編號 205-4838
製造零件編號GRL18-F2336
BrandSick
HK$681.99
單位
Barrel Retro Reflective 7.2 m PNP Connector M12 - - - 30V 3-pin PinPoint LED IP67 - -
RS庫存編號 818-1731
製造零件編號EE-SX671-WR 1M
BrandOmron
HK$327.65
單位
Fork Through Beam (Fork) 5 mm NPN - - - - 24V Pre-Wired Infrared IP50 35 mA -
RS庫存編號 136-5658
製造零件編號EX-Z12FB-P
BrandPanasonic
HK$831.78
單位
Block Through Beam (Emitter and Receiver) 200 mm PNP Cable - - - 24V Wire Lead LED IP67 20 mA -