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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คัดกรอง / Filters

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รายละเอียดสินค้า / Description ราคา / Price Sensor Style Detection Type Detection Range Output Type Electrical Connection Maximum AC Voltage Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface Response Time Housing Material
RS Stock No. 627-6556
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.OPB704W-Z
Brand :Optek
THB117.77
Each
Units
Block Retroreflective 3.8 mm NPN 4-Wire Cable 0.61m - - - Infrared - - - - Plastic
RS Stock No. 170-0724
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.OPB704W-Z
Brand :Optek
THB112.838
Each (In a Bag of 100)
Units
Block Retroreflective 3.8 mm NPN 4-Wire Cable 0.61m - - - Infrared - - - - Plastic
RS Stock No. 194-4018
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.OPB608A
Brand :Optek
THB47.17
Each
Units
Block Retroreflective 1.27 → 9.525 mm NPN - - - Wire Lead Infrared - - - - Plastic
RS Stock No. 908-7129
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.OPB750T
Brand :Optek
THB139.97
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 307-913
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.OPB704
Brand :Optek
THB78.31
Each
Units
Block Retroreflective 3.8 mm NPN - - - Wire Lead Infrared - - - - Plastic
RS Stock No. 908-7081
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.OPB700Z
Brand :Optek
THB304.52
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 301-606
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.OPB706B
Brand :Optek
THB60.43
Each
Units
Block Retroreflective 1.27 mm NPN - - - Wire Lead Infrared - - - - Plastic
RS Stock No. 908-7021
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.OP506A
Brand :Optek
THB24.66
Each: (In a Pack of 50)
Units
- - - - - - - - - - - - - -
RS Stock No. 908-7087
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.OPB700ALZ
Brand :Optek
THB363.52
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 908-7116
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.OPB733TR
Brand :Optek
THB112.30
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 627-8388
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.OPB715-Z
Brand :Optek
THB197.00
Each
Units
Block Retroreflective 12.7 mm - - - 5.25V Wire Lead LED - - - - Plastic
RS Stock No. 908-7126
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.OPB771TZ
Brand :Optek
THB268.96
Each
Units
Barrel Diffuse 2.03 → 5.59 mm TTL Wire - 1.8V Wire Lead LED - 40 mA - - -
RS Stock No. 170-0725
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.OPB715-Z
Brand :Optek
THB197.00
Each (In a Bag of 25)
Units
Block Retroreflective 12.7 mm - - - 5.25V Wire Lead LED - - - - Plastic
RS Stock No. 908-7104
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.OPB730
Brand :Optek
THB267.29
Each
Units
Barrel Diffuse Maximum of 6.35 mm Photodarlington 4-Wire Cable 2m - 1.5V Wire Lead LED - 50 mA - - Plastic
RS Stock No. 908-7163
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.OPB829DZ
Brand :Optek
THB136.11
Each
Units
Block Through Beam (Fork) 3.18 → 8 mm Phototransistor Wire - 1.7V Wire Lead LED - 50 mA - - Plastic
RS Stock No. 908-7090
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.OPB701ALZ
Brand :Optek
THB404.44
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 908-7110
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.OPB745
Brand :Optek
THB107.52
Each
Units
- - - - - - - - - - - - - -