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 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 307-913
製造零件編號OPB704
BrandOptek
HK$23.98
單位
Block Retroreflective 3.8 mm NPN - - - - - Wire Lead Infrared - - -
RS庫存編號 752-5133
製造零件編號XUB9BPANL2
HK$577.64
單位
Barrel Retroreflective 2 m PNP Cable - - - 24V - LED IP65, IP67 100 mA -
RS庫存編號 818-1699
製造零件編號EE-SX772A
BrandOmron
HK$329.36
單位
Fork Through Beam (Fork) 5 mm NPN - - - - 24V Pre-Wired Infrared IP60 100 mA -
RS庫存編號 510-3255
製造零件編號RLK29-55/25/116-SET
HK$1,173.29
單位
Block Retroreflective 12 m Relay 6-Terminal Screw - 230V - 230V - LED IP67 2 A -
RS庫存編號 768-5866
製造零件編號E3FA-TN11 2M
BrandOmron
HK$972.25
單位
Barrel Through Beam (Emitter and Receiver) 20 m NPN 2/4-Wire Cable 2m - - - 30V - LED IP67, IP69K 40 mA -
RS庫存編號 891-9514
製造零件編號RLK31-8-2500-IR/31/115
HK$704.61
單位
Block Diffuse 0 → 2.5 m Relay 5-Wire Cable 2m - 240V - 240V - Infrared IP67 40 mA -
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 -
RS庫存編號 786-5918
製造零件編號WL12L-2B530
BrandSick
HK$4,870.78
單位
Block Retroreflective 0 → 18 m NPN/PNP 5-Pin M12 Connector - - - 30V - Laser Light IP67, IP69K 100 mA -
RS庫存編號 812-8226
製造零件編號CX-442-P-Z
BrandPanasonic
HK$837.24
單位
Block Diffuse 800 mm PNP 4-Pin M8 Connector - - - 24V - LED IP67 20 mA -
RS庫存編號 818-1558
製造零件編號E3JM-DS70M4T-US
BrandOmron
HK$1,918.67
單位
Block Diffuse 700 mm Relay 5-Terminal Screw - 250V - 5V - Infrared IP66 3 A -
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 361-5532
製造零件編號EX-13EA-PN
BrandPanasonic
HK$1,037.11
單位
Block Through Beam (Emitter and Receiver) 500 mm PNP 3-Wire Cable 2m - - - 24V - LED IP67 50 mA -
RS庫存編號 903-3958
BrandRS PRO
HK$512.13
單位
Fork Through Beam (Fork) 15 mm PNP Cable - - - 30V Pre-Wired Infrared IP64 15 mA -
RS庫存編號 219-2319
製造零件編號EE-SPX303N
BrandOmron
HK$560.48
單位
Fork Through Beam (Fork) 13 mm NPN Non-Solder Connector - - - 24V - Infrared IP50 80 mA -
RS庫存編號 729-9070
製造零件編號E3Z-G82 (HK)
BrandOmron
HK$929.90
單位
Fork Through Beam 25 mm PNP Pre-Wired Cable - - - 26.4V - Infrared IP64 100 mA -
RS庫存編號 818-1520
製造零件編號EE-SPY411
BrandOmron
HK$500.58
單位
Block Convergent 2 → 5 mm NPN - - - - 24V Connector Infrared IP50 50 mA -
RS庫存編號 609-9731
製造零件編號EQ512
BrandPanasonic
HK$1,685.38
單位
Block Diffuse 0.1 → 1 m PNP 4-Terminal Screw - - - 24V Screw Infrared IP67 100 mA -
RS庫存編號 420-473
製造零件編號E3SAR86
BrandOmron
HK$2,995.50
單位
Block Retroreflective 0.1 → 2 m PNP M12 Connector - - - 30V - LED IP67 100 mA -