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
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RS庫存編號 212-4869
製造零件編號XUYAFP946S
HK$1,731.19
單位
- Through Beam - PNP and NPN Cable - - - - - - - - -
全新
RS庫存編號 211-8514
製造零件編號XUYFANEP100005
HK$2,037.48
單位
Fork Thru beam 5 mm Solid state 1 male connector M8, 4 pins - - - - - - - - -
全新
RS庫存編號 216-4845
製造零件編號XUYPS989SP
HK$1,295.86
單位
Miniature Through Beam 4 M PNP Cable - - - - - - - - -
全新
RS庫存編號 211-8515
製造零件編號XUYPCO925L2ANSP
HK$8,962.95
單位
Compact Diffuse 85 mm - 1 male connector M12, 4 pins - - - - - - - - -
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RS庫存編號 212-4870
製造零件編號XUYFNEP60005
HK$1,660.32
單位
Fork Through Beam W x D (5 X 59) mm PNP and NPN 1 male connector M8, 4 pins - - - - - - - - -
全新
RS庫存編號 211-8512
製造零件編號XUYBCO989SP
HK$1,224.56
單位
Miniature LED, Pulsed 1000 mm Solid state 1 male connector M8, 4 pins - - - - - - - - -
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RS庫存編號 211-8513
製造零件編號XUYF953002COS
HK$2,418.18
單位
Block Thru beam 2 mm Solid state 1 male connector M8, 4 pins - - - - - - - - -
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RS庫存編號 212-4871
製造零件編號XUYPS1LCO965S
HK$5,821.24
單位
Compact Through Beam 50 → 300 mm PNP and NPN 1 male connector M8, 4 pins - - - - - - - - -
全新
RS庫存編號 211-8511
製造零件編號XUYAFV946S
HK$1,842.01
單位
- LED 2000 mm Solid state Cable - - - - - - - - -