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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Description 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庫存編號 902-7045
製造零件編號BOS 5K-PU-LH12-S75
BrandBALLUFF
HK$1,240.78
單位
Block Background Suppression 20 → 300 mm PNP 4-Pin M8 Connector - - 30V Connector LED IP67 100 mA - 0.25 ms
RS庫存編號 905-5062
製造零件編號BGL0019
BrandBALLUFF
HK$1,873.19
單位
Fork Through Beam (Fork) - PNP 3-Pin M8 Connector - - 30V M8 Laser Light IP67 - - -
RS庫存編號 902-7146
製造零件編號BOS 18M-PS-IR23-S4
BrandBALLUFF
HK$984.30
單位
Barrel Retroreflective 6 m PNP M12 Connector - - 30V Connector Infrared IP67 - - -
RS庫存編號 902-7120
製造零件編號BOS 12M-PS-PR10-S4
BrandBALLUFF
HK$751.61
單位
Barrel Retroreflective 3 m PNP M12 Connector - - 30V Connector LED IP67 100 mA - 0.5 ms
RS庫存編號 902-7183
製造零件編號BOS 21M-PA-ID10-S4
BrandBALLUFF
HK$1,646.44
單位
Block Diffuse 50 mm → 2 m PNP M12 Connector - - 30V Connector LED IP67 100 mA - 1 ms
RS庫存編號 902-7206
製造零件編號BOS 26K-PA-1QE-S4-C
BrandBALLUFF
HK$1,503.33
單位
Block Retroreflective 0 → 55 m PNP M12 Connector - - 30V Connector LED IP67 200 mA - 0.5 ms
RS庫存編號 179-6302
製造零件編號BOS 21M-PA-RH22-S4
BrandBALLUFF
HK$1,882.65
單位
- Diffuse 1 → 400 mm PNP 4-Pin M12 Connector - - 30V - LED IP67 40 mA PNP-NO/NC -
RS庫存編號 494-6809
製造零件編號BOWA 1208-PS-C-S49
BrandBALLUFF
HK$7,862.25
單位
Block Through Beam (Fork) 120 mm PNP 3-Pin M8 Connector - - 30V - Infrared IP65 200 mA - -
RS庫存編號 124-3792
BrandBALLUFF
HK$1,096.90
單位
Barrel Retroreflective 7 m PNP 4-Pin M12 Connector - - 30V 4-Pin Connector LED IP67 100 mA - 1.25 ms
RS庫存編號 902-6991
製造零件編號BOS R020K-PS-RX11-00,2-S49
BrandBALLUFF
HK$1,276.59
單位
Block Through Beam (Emitter and Receiver) 0 → 2000 mm PNP M8 Connector - - - Connector LED IP67 - - -
RS庫存編號 418-4922
製造零件編號BGL 120A-001-S49
BrandBALLUFF
HK$2,016.30
單位
Fork Through Beam (Fork) 120 mm PNP 3-Pin M8 Connector - - 30V - LED IP67 200 mA - -
RS庫存編號 902-6994
製造零件編號BOS R020K-PS-PR11-00,2-S49
BrandBALLUFF
HK$942.54
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Block Retroreflective 25 → 3000 mm PNP M8 Connector - - - Connector LED IP67 - - -
RS庫存編號 902-7177
製造零件編號BOS 21M-PA-RD10-S4
BrandBALLUFF
HK$1,551.04
單位
Block Diffuse 10 mm → 1 m PNP M12 Connector - - 30V Connector LED IP67 100 mA - 1 ms
RS庫存編號 135-0290
製造零件編號BOS 50K-PI-RD11-S4
BrandBALLUFF
HK$2,037.82
單位
Block Diffuse 1 → 3500 mm PNP 4-Pin M12 Connector - IO-LINK 30V 4-Pin Connector LED IP67 100 mA IO-Link -
RS庫存編號 902-7007
製造零件編號BOS 5K-PS-RH12-S49
BrandBALLUFF
HK$996.31
單位
Block Diffuse 50 → 200 mm PNP 3-Pin M8 Connector - - 30V Connector LED IP67 100 mA - 1 ms
RS庫存編號 902-7048
製造零件編號BOS 5K-PO-IX10-S49
BrandBALLUFF
HK$1,103.50
單位
- - - PNP - - - - - Infrared LED IP67 - - 1 ms
RS庫存編號 902-7124
製造零件編號BOS 12M-PS-PR10-02
BrandBALLUFF
HK$751.61
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Barrel Retroreflective 3 m PNP Cable - - 30V Cable LED IP67 100 mA - 0.5 ms
RS庫存編號 902-7186
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BrandBALLUFF
HK$1,781.89
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Block Retroreflective 0 → 4 m PNP M12 Connector - - 30V Connector LED IP67 100 mA - 0.5 ms
RS庫存編號 902-7158
製造零件編號BOS 18M-PS-RE23-S4
BrandBALLUFF
HK$686.06
單位
Barrel Through Beam (Receiver) 20 m PNP M12 Connector - - 30V Connector LED IP67 - - -
RS庫存編號 902-7041
製造零件編號BOS 5K-PO-IX10-S75-S
BrandBALLUFF
HK$1,103.50
單位
Block Through Beam (Emitter and Receiver) 0 → 10 m PNP 4-Pin M8 Connector - - 30V Connector LED IP67 100 mA - ≤1 ms