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 Optical Technology Terminal Type Light Source IP Rating Maximum Current Interface Response Time
RS Stock No. 808-9159
Mfr. Part No.CX-491
BrandPanasonic
MYR397.55
Each
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Block Retroreflective 3 m NPN 2m Cable - 24V Phototransistor - LED IP67 100 mA - 1 ms
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MYR675.65
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Block Diffuse 10 → 60 mm PNP 4-Pin M8 Connector - 30V Phototransistor - LED IP65 100 mA - <0.5 ms
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Mfr. Part No.E3Z-T61-D 2M
BrandOmron
MYR362.34
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Block Through Beam (Receiver) 15 m NPN 2/3-Wire Cable 2m - 24V LED Wire Lead Infrared IP67 20 mA - 1 ms
RS Stock No. 847-9508
Mfr. Part No.QS30FF200Q
BrandBanner
MYR511.21
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Block Diffuse Maximum of 200 mm NPN/PNP 5-Pin M12 Connector - 30V Visible Red LED - LED IP67 <40 mA - 2 ms
RS Stock No. 480-4985
Mfr. Part No.EQ501
BrandPanasonic
MYR748.78
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Block Diffuse 0.1 → 2.5 m Relay 4-Terminal Screw 250V 30V - Screw Infrared IP67 3 A - <=20 ms
RS Stock No. 530-0945
Mfr. Part No.WTB4-3N2161
BrandSick
MYR721.14
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Block Diffuse 4 → 150 mm NPN 3-Pin M8 Connector - 30V Phototransistor - LED IP66, IP67 100 mA - <0.5 ms
RS Stock No. 808-9183
Mfr. Part No.CX-424
BrandPanasonic
MYR413.43
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Block Diffuse 100 mm NPN 2m Cable - 24V Phototransistor - Infrared IP67 100 mA - 1 ms
RS Stock No. 219-2375
Mfr. Part No.EE-SPY401 JPN
BrandOmron
MYR195.65
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Block Retroreflective 5 mm NPN Non-Solder Connector - 24V Phototransistor - Infrared IP50 80 mA - -
RS Stock No. 372-8155
Mfr. Part No.E3ZD622M
BrandOmron
MYR579.10
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Block Diffuse 1 m NPN 3-Wire Cable 2m - 26.4V Phototransistor - Infrared IP69K 100 mA - 1 ms
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Barrel Diffuse 15 → 300 mm PNP M12 Connector - 36V - Wire Lead LED IP67 25 mA - -
RS Stock No. 807-4551
Mfr. Part No.EE-SX1103
BrandOmron
MYR7.21
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Block Diffuse - - - 1.6V - Phototransistor PCB Pin - - 50 mA - 10 μs
RS Stock No. 818-1624
Mfr. Part No.EE-SX471
BrandOmron
MYR103.08
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Fork Through Beam (Fork) Maximum of 5 mm NPN - - 24V Phototransistor Connector Infrared IP50 12 mA - -
RS Stock No. 786-5936
Mfr. Part No.WTB140-P430
BrandSick
MYR878.53
Each
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Block Background Suppression 2 → 500 mm PNP 4-Pin M8 Connector - 30V Phototransistor - LED IP67 100 mA - 0.5 ms
RS Stock No. 729-5117
BrandRS PRO
MYR433.54
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Barrel Retro-Reflective 0.05 → 7 m PNP Cable - 30V Phototransistor - LED IP67 100 mA - <=0.5 ms
RS Stock No. 450-2948
Mfr. Part No.OBT200-18GM60-E5
MYR469.82
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Barrel Diffuse 200 mm PNP 4-Wire Cable 2m - 30V Phototransistor - Infrared IP67 100 mA - <=1 ms
RS Stock No. 394-8999
Mfr. Part No.XUK8AKSNM12
MYR720.70
Each
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Compact Diffuse 1 m NPN/PNP 4-Pin M12 Connector - 24V Phototransistor - Infrared IP30, IP65 100 mA - <=2 ms
RS Stock No. 219-2410
Mfr. Part No.EE-SY672
BrandOmron
MYR117.39
Each
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Block Retroreflective 1 → 5 mm NPN - - 24V Phototransistor - Infrared IP50 100 mA - -
RS Stock No. 818-1554
Mfr. Part No.E3JM-R4M4T-US
BrandOmron
MYR921.60
Each
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Block Retroreflective Maximum of 4 m Relay 5-Terminal Screw 250V 5V LED - LED IP66 3 A - 30 ms
RS Stock No. 695-6801
Mfr. Part No.XUB1APANM12
MYR265.94
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Barrel Retroreflective 4 m PNP 4-Pin M12 Connector - 24V Phototransistor - Infrared IP65, IP67 100 mA - <1 ms
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BrandOmron
MYR737.71
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Block Retroreflective 0 → 700 mm PNP 4-Pin M12 Connector - 30V - Cable LED IP67, IP69 100 mA - 0.5 ms
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