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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กำลังดูสินค้า 61 - 80 รายการจาก 2220 รายการ / Viewing 61 - 80 of 2220 products
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รายละเอียดสินค้า / Description ราคา / Price Sensor Style Detection Type Detection Range Output Type Electrical Connection Maximum AC Voltage Communication Protocol Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface Response Time
RS Stock No. 729-5185
Brand :RS PRO
THB4,174.20
Each
Units
Block Background Suppression 5 → 250 mm PNP 4-Pin M8 Connector - - 24V - LED IP67 100 mA - <625 μs
RS Stock No. 903-3958
Brand :RS PRO
THB2,328.90
Each
Units
Fork Through Beam (Fork) 15 mm PNP Cable - - 30V Pre-Wired Infrared IP64 15 mA - <1 ms
ใหม่ / New
RS Stock No. 204-4008
Brand :RS PRO
THB1,160.92
Each
Units
Barrel Through Beam Reflection 20 m NPN NO+NC 2m PVC Cable - - 30V - LED IP67 - - <8.2 m/s
ใหม่ / New
RS Stock No. 204-3993
Brand :RS PRO
THB919.60
Each
Units
Barrel Through Beam Reflection 5 m PNP NO 2m PVC Cable - - 30V - LED IP67 - - <8.2 m/s
RS Stock No. 256-405
Brand :RS PRO
THB3,624.67
Each
Units
Barrel Diffuse 200 mm PNP M12 Connector - - 30V - Infrared IP67 100 mA - 6 ms
ใหม่ / New
RS Stock No. 204-4009
Brand :RS PRO
THB1,160.92
Each
Units
Barrel Through Beam Reflection 20 m PNP NO+NC 2m PVC Cable - - 30V - LED IP67 - - <8.2 m/s
ใหม่ / New
RS Stock No. 204-3989
Brand :RS PRO
THB1,464.41
Each
Units
Barrel Retro Reflection 3 m PNP NO M12 Connector - - 30V - Yellow LED IP67 - - <8.2 m/s
ใหม่ / New
RS Stock No. 204-3978
Brand :RS PRO
THB1,531.80
Each
Units
Barrel Diffuse Reflection 100 cm NPN NO+NC 2m PVC Cable - - 30V - Yellow LED IP67 - - <8.2 m/s
RS Stock No. 729-5189
Brand :RS PRO
THB4,174.20
Each
Units
Block Background Suppression 5 → 250 mm PNP Cable - - 24V - LED IP67 100 mA - <625 μs
RS Stock No. 729-5139
Brand :RS PRO
THB3,088.76
Each
Units
Block Diffuse 40 → 1000 mm NPN Cable - - 30V - LED IP67 100 mA - <=2.5 ms
RS Stock No. 729-5154
Brand :RS PRO
THB3,566.25
Each
Units
Block Retroreflective 0.15 → 10 m NPN Cable - - 30V - LED IP67 100 mA - 2.5 ms
RS Stock No. 729-5191
Brand :RS PRO
THB2,539.86
Each
Units
Block Retroreflective 7.2 m NPN Cable - - 24V - LED IP67 100 mA - <625 μs
RS Stock No. 729-5176
Brand :RS PRO
THB4,843.50
Each
Units
Block Through Beam (Emitter) 20 m PNP Cable - - 30V - LED IP67 100 mA - 2.5 ms
ใหม่ / New
RS Stock No. 204-3970
Brand :RS PRO
THB1,598.32
Each
Units
Barrel Diffuse Reflection 400 mm NPN NO+NC M12 Connector - - 30V - Yellow LED IP67 - - <8.2 m/s
ใหม่ / New
RS Stock No. 204-3979
Brand :RS PRO
THB1,531.80
Each
Units
Barrel Diffuse Reflection 100 cm PNP NO+NC 2m PVC Cable - - 30V - Yellow LED IP67 - - <8.2 m/s
ใหม่ / New
RS Stock No. 204-4007
Brand :RS PRO
THB773.94
Each
Units
Barrel Through Beam Reflection 20 m NPN NO+NC 2m PVC Cable - - 30V - LED IP67 - - <8.2 m/s
RS Stock No. 729-5113
Brand :RS PRO
THB2,717.03
Each
Units
Barrel Retro-Reflective 0.05 → 7 m PNP 4-Pin M12 Connector - - 30V - LED IP67 100 mA - <=0.5 ms
RS Stock No. 778-8700
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.E3JK-DR12 2M
Brand :Omron
THB3,257.00
Each
Units
Block Diffuse 300 mm Relay 5-Wire Cable 2m 240V - 240V Wire Lead LED IP64 - - 20 ms
RS Stock No. 821-0056
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.E3Z-T61-D 2M
Brand :Omron
THB3,692.45
Each
Units
Block Through Beam (Receiver) 15 m NPN 2/3-Wire Cable 2m - - 24V Wire Lead Infrared IP67 20 mA - 1 ms
RS Stock No. 739-6673
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.O1D100
THB13,967.56
Each
Units
Block Diffuse 0.2 → 10 m Analogue, PNP M12 Connector - - 30V - Laser Light IP67 200 mA - -