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 Stock No. 909-2881
Mfr. Part No.Q4XTBLAF300-Q8
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TWD15,420.00
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units
Barrel Diffuse 25 → 300 mm Bipolar NPN/PNP M12 Connector - - 30V M12 Laser Light IP67, IP68, IP69K - - 50 ms
RS Stock No. 909-2869
Mfr. Part No.Q3XTBLD-Q8
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TWD8,797.00
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units
Barrel Diffuse 0 → 300 mm Bipolar NPN/PNP M12 Connector - - 30V M12 Laser Light IP67, IP68, IP69K <28 mA - 5 ms
RS Stock No. 842-3007
Mfr. Part No.Q20PDL
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TWD4,143.00
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units
Block Diffuse Maximum of 800 mm PNP Cable - - 30V - LED IP67 18 mA - 800 μs
RS Stock No. 176-9852
Mfr. Part No.QS18VP6FF50
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TWD4,031.00
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units
Block Through Beam 50 mm PNP M18 Connector - - 30V Connector LED IP67 - - 0.85 ms
RS Stock No. 847-9287
Mfr. Part No.QS18VP6CV45Q8
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TWD3,707.00
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units
Barrel Convergent Maximum of 43 mm PNP 4-Pin Connector - - 30V - LED IP67 100 mA - 600 μs
RS Stock No. 175-7825
Mfr. Part No.Q4XFNCOD310-Q8
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TWD12,674.00
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units
Block Distance 35 → 310 mm NPN 5-Pin M12 Connector - - 30V M12 Connector LED IP67, IP68, IP69K 100 mA - 1.5 ms
New
RS Stock No. 191-5196
Mfr. Part No.VS8EAPLPQ
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TWD5,712.00
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units
- Retroreflective 0.1 → 1.6 m PNP 4-Pin M8/Picostyle Cable 200 mm - - 30V Cable Red LED IP67 <20 mA - 500 μs
RS Stock No. 175-7846
Mfr. Part No.SMBAMS18P
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TWD882.00
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units
- - - - - - - - - - - - - -
New
RS Stock No. 190-4205
Mfr. Part No.T18-2NAEL-Q8
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TWD2,054.00
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units
Barrel Opposed 25 m - 4 Pin M12 Connector - - 30V 4 Pin M12 Connector Red LED IP67, IP68, IP69K <16 mA - 1 (OFF) ms, 1.5 (ON) ms
RS Stock No. 175-7826
Mfr. Part No.Q4XFPCOD310-Q8
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TWD12,674.00
Each
units
Block Distance 35 → 310 mm PNP 4-Pin M12 Connector - - 30V M12 Connector LED IP67, IP68, IP69K 100 mA - 1.5 ms
RS Stock No. 860-1702
Mfr. Part No.SM312LV
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TWD4,420.00
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Block Retroreflective Maximum of 5 m NPN/PNP Cable - - 30V - LED IP67 25 mA - 1 (Dark) ms, 1 (Light) ms
RS Stock No. 176-9853
Mfr. Part No.QS18VP6FF50Q8
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TWD4,031.00
Each
units
Block Diffuse 50 mm PNP M18 Connector - - 30V Connector LED IP67 - - 0.85 ms
RS Stock No. 860-1765
Mfr. Part No.SM31RL
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TWD6,131.00
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units
Block Through Beam (Receiver) 30 m NPN/PNP Cable - - 30V - LED IP67 25 mA - 1 (Dark) ms, 1 (Light) ms
RS Stock No. 842-2877
Mfr. Part No.Q126EQ
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TWD2,585.00
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Block Through Beam (Emitter) Maximum of 2 m - Cable - - 30V - LED IP67 20 mA - 1.3 (ON) ms, 900 (OFF) μs
RS Stock No. 405-7397
Mfr. Part No.QS18VP6DQ
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TWD4,310.00
Each
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Block Diffuse 450 mm PNP Cable - - 30V - LED IP67 100 mA - 600 ms
RS Stock No. 175-7829
Mfr. Part No.Q4XTKLAF300-Q8
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TWD12,565.00
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units
Block Distance 25 → 300 mm NPN/PNP 4-Pin M12 Connector - IO-LINK 30V M12 Connector LED IP67, IP68, IP69K 100 mA IO-Link 1.5 ms
RS Stock No. 405-7173
Mfr. Part No.M126E2LD
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TWD18,818.00
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Barrel Through Beam (Emitter) - - Connector - - 30V - LED IP67 30 mA - 30 ms
New
RS Stock No. 190-4221
Mfr. Part No.T18-2VPRL-2M
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TWD3,094.00
Each
units
Barrel Opposed 25 m PNP Cable - - 30V Cable Red LED IP67, IP68, IP69K <16 mA - 1 (OFF) ms, 1.5 (ON) ms
RS Stock No. 909-2871
Mfr. Part No.Q3XTBLD100-Q8
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TWD8,899.00
Each
units
Barrel Diffuse 0 → 100 mm Bipolar NPN/PNP M12 Connector - - 30V M12 Laser Light IP67, IP68, IP69K <28 mA - 5 ms
RS Stock No. 842-3331
Mfr. Part No.Q60BB6AFV1000Q
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TWD7,953.00
Each
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- - - NPN, PNP - - - - - Visible Red LED IP67 - - 2 ms