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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RS庫存編號 2509664903
製造零件編號SM312DBZQD
HK$1,143.52
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RS庫存編號 2509664802
製造零件編號MBC-4
HK$324.94
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RS庫存編號 2509666498
製造零件編號T18SP6LQ
HK$990.78
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RS庫存編號 2509667110
製造零件編號T18SN6R
HK$844.76
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RS庫存編號 2509202980
製造零件編號MPL6HD
HK$1,613.92
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RS庫存編號 2508470110
製造零件編號MPS32HD
HK$1,204.14
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RS庫存編號 2552565673
製造零件編號LT3PILVQ (1)
BrandBanner
HK$16,318.00
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RS庫存編號 2550074836
製造零件編號T18VP6URQ
HK$2,055.62
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RS庫存編號 2509203523
製造零件編號VL18-54-M/40A/118/128
HK$1,409.10
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RS庫存編號 2509202693
製造零件編號MHP-D33Q
HK$1,690.78
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RS庫存編號 2509665136
製造零件編號SMA31E
HK$1,039.64
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RS庫存編號 2509667441
製造零件編號VS3RN5XLP
HK$1,221.64
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RS庫存編號 2509664666
製造零件編號S18S2P6FF100Q
HK$1,260.56
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RS庫存編號 2509667069
製造零件編號S183E
HK$552.44
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RS庫存編號 2509665574
製造零件編號SM2A912LVQD
HK$1,936.62
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RS庫存編號 2509666921
製造零件編號S18SN6LP
HK$974.68
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RS庫存編號 2509664874
製造零件編號RLM5
HK$932.96
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RS庫存編號 2508470384
製造零件編號RLK238H2000IR/31104116
HK$2,783.06
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RS庫存編號 2508470154
製造零件編號MPV11HD
HK$1,613.92
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RS庫存編號 2509202968
製造零件編號MPG6HD
HK$1,806.14
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