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 Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface Response Time Housing Material
RS Stock No. 902-7089
Mfr. Part No.BOS 11K-PA-ID10-00,15-S4
BrandBALLUFF
$135.21
Each
units
Block Diffuse 10 → 450 mm PNP M12 Connector - 30V Connector LED IP67 100 mA - - ABS
RS Stock No. 902-7192
Mfr. Part No.BOS 26K-PA-1HC-S4-C
BrandBALLUFF
$400.17
Each
units
Block Diffuse 30 → 300 mm PNP M12 Connector - 30V Connector LED IP67 200 mA - 0.5 ms Impact Resistant ABS
RS Stock No. 418-5256
Mfr. Part No.BGL 20 A-001-S49
BrandBALLUFF
$357.37
Each
units
Fork Through Beam (Fork) 20 mm PNP - - 30V - LED IP67 200 mA - - Anodised Aluminium
RS Stock No. 902-7142
Mfr. Part No.BOS 18M-PS-PR23-S4
BrandBALLUFF
$146.39
Each
units
Barrel Retroreflective Maximum of 4 m PNP M12 Connector - 30V Connector LED IP67 - - - Nickel Plated Brass
RS Stock No. 902-7029
Mfr. Part No.BOS 5K-PS-RR10-02
BrandBALLUFF
$144.63
Each
units
Block Retroreflective 0.1 → 4 m PNP Cable - 30V Cable LED IP67 100 mA - 1 ms PBT, PC
RS Stock No. 902-7120
Mfr. Part No.BOS 12M-PS-PR10-S4
BrandBALLUFF
$144.51
Each
units
Barrel Retroreflective Maximum of 3000 mm PNP M12 Connector - 30V Connector LED IP67 100 mA - 0.5 ms Brass
RS Stock No. 902-7045
Mfr. Part No.BOS 5K-PU-LH12-S75
BrandBALLUFF
$206.41
Each
units
Block Background Suppression 20 → 300 mm PNP 4-Pin M8 Connector - 30V Connector LED IP67 100 mA - 0.25 ms PBT, PC
RS Stock No. 902-7041
Mfr. Part No.BOS 5K-PO-IX10-S75-S
BrandBALLUFF
$209.58
Each
units
Block Through Beam (Emitter and Receiver) 0 → 10 m PNP 4-Pin M8 Connector - 30V Connector LED IP67 100 mA - ≤1 ms PBT, PC
RS Stock No. 418-5234
Mfr. Part No.BGL 10 A-001-S49
BrandBALLUFF
$185.63
Each
units
Fork Through Beam (Fork) 10 mm PNP - - 30V - LED IP67 200 mA - - Anodised Aluminium
RS Stock No. 902-7076
Mfr. Part No.BOS 6K-PU-PR10-S75
BrandBALLUFF
$183.41
Each
units
Block Retroreflective Maximum of 10 m PNP 4-Pin M8 Connector - 30V Connector LED IP67, IP69K 100 mA - 0.5 ms ABS
RS Stock No. 124-3748
BrandBALLUFF
$95.60
Each
units
Barrel Retroreflective 0 → 4.5 m PNP 4-Pin M12 Connector - 30V 4-Pin Connector LED IP67 100 mA - 0.5 ms PBT
RS Stock No. 814-1086
Mfr. Part No.BOS 5K-PS-ID10-S75
BrandBALLUFF
$112.39
Each
units
Block Diffuse 0 → 900 mm PNP 4-Pin M8 Connector - 30V Cable Infrared IP67 100 mA - - PBT, PC
RS Stock No. 902-7133
Mfr. Part No.BOS 12M-X-RS10-S4
BrandBALLUFF
$92.23
Each
units
Barrel Through Beam (Emitter) 0 → 8 m - M12 Connector - 30V Connector LED IP67 15 (No-Load) mA - - -
RS Stock No. 418-5228
Mfr. Part No.BGL 5 A-001-S49
BrandBALLUFF
$243.38
Each
units
Fork Through Beam (Fork) 5 mm PNP - - 30V - LED IP65 200 mA - - Anodised Aluminium
RS Stock No. 814-1073
Mfr. Part No.BOS R020K-PS-RF10-00,2-S49
BrandBALLUFF
$146.73
Each
units
Block Diffuse 1 → 15 mm PNP M8 x 1-S49 - 30V Cable LED IP67 50 mA - - ABS
RS Stock No. 902-7124
Mfr. Part No.BOS 12M-PS-PR10-02
BrandBALLUFF
$124.76
Each
units
Barrel Retroreflective Maximum of 3000 mm PNP Cable - 30V Cable LED IP67 100 mA - 0.5 ms Brass
RS Stock No. 418-4922
Mfr. Part No.BGL 120A-001-S49
BrandBALLUFF
$286.86
Each
units
Fork Through Beam (Fork) 120 mm PNP 3-Pin M8 Connector - 30V - LED IP67 200 mA - - Anodised Aluminium
RS Stock No. 902-7146
Mfr. Part No.BOS 18M-PS-IR23-S4
BrandBALLUFF
$163.49
Each
units
Barrel Retroreflective Maximum of 6 m PNP M12 Connector - 30V Connector Infrared IP67 - - - Nickel Plated Brass
RS Stock No. 902-7051
Mfr. Part No.BOS 6K-PU-RH11-S75
BrandBALLUFF
$337.57
Each
units
Block Background Suppression 3 → 400 mm PNP 4-Pin M8 Connector - 30V Connector LED IP67, IP69K 100 mA - 0.5 ms ABS
RS Stock No. 902-7057
Mfr. Part No.BOS 5K-PU-LX10-S75
BrandBALLUFF
$226.37
Each
units
Block Through Beam (Emitter and Receiver) 0 → 30 m PNP 4-Pin M8 Connector - 30V Connector LED - - - - -