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. 814-0367
Mfr. Part No.O6P303
MYR628.71
Each
units
Block Retroreflective 0.05 5 m PNP 4-Pin M8 Connector - 30V Cable LED IP65, IP67, IP68, IP69 12 mA - - Stainless Steel
RS Stock No. 372-8155
Mfr. Part No.E3ZD622M
BrandOmron
MYR608.06
Each
units
Block Diffuse 1 m NPN 3-Wire Cable 2m - 26.4V - Infrared IP69K 100 mA - 1 ms PBT
RS Stock No. 218-939
Mfr. Part No.WL100L-E2231
BrandSick
MYR750.24
Each
units
Block Retroreflective 0.08 12 m NPN 4-Pin M8 Connector - 30V - Laser Light IP65 100 mA - <0.25 ms ABS, PMMA
RS Stock No. 480-4985
Mfr. Part No.EQ501
BrandPanasonic
MYR786.22
Each
units
Block Diffuse 0.1 2.5 m Relay 4-Terminal Screw 250V 30V Screw Infrared IP67 3 A - <=20 ms ABS
RS Stock No. 808-9171
Mfr. Part No.CX-422
BrandPanasonic
MYR407.79
Each
units
Block Diffuse 800 mm NPN 2m Cable - 24V - Infrared IP67 100 mA - 1 ms PBT
RS Stock No. 219-2375
Mfr. Part No.EE-SPY401 JPN
BrandOmron
MYR205.43
Each
units
Block Retroreflective 5 mm NPN Non-Solder Connector - 24V - Infrared IP50 80 mA - - PC
RS Stock No. 818-1621
Mfr. Part No.EE-SX672P
BrandOmron
MYR110.63
Each
units
Fork Through Beam (Fork) Maximum of 5 mm PNP 4-Pin Connector - 24V Connector Infrared IP50 12 mA - - PBT
RS Stock No. 808-9183
Mfr. Part No.CX-424
BrandPanasonic
MYR434.10
Each
units
Block Diffuse 100 mm NPN 2m Cable - 24V - Infrared IP67 100 mA - 1 ms PBT
RS Stock No. 542-5094
Mfr. Part No.FHDK 07P 6901 KS35A
BrandBaumer
MYR871.56
Each
units
Block Diffuse 10 → 60 mm PNP 4-Pin M8 Connector - 30V - LED IP65 100 mA - <0.5 ms Polyamide
RS Stock No. 530-0945
Mfr. Part No.WTB4-3N2161
BrandSick
MYR757.20
Each
units
Block Diffuse 4 150 mm NPN 3-Pin M8 Connector - 30V - LED IP66, IP67 100 mA - <0.5 ms Bayblend, PMMA
RS Stock No. 847-9508
Mfr. Part No.QS30FF200Q
BrandBanner
MYR536.77
Each
units
Block Diffuse Maximum of 200 mm NPN/PNP 5-Pin M12 Connector - 30V - LED IP67 <40 mA - 2 ms ABS
RS Stock No. 821-0056
Mfr. Part No.E3Z-T61-D 2M
BrandOmron
MYR343.58
Each
units
Block Through Beam (Receiver) 15 m NPN 2/3-Wire Cable 2m - 24V Wire Lead Infrared IP67 20 mA - 1 ms PBT
RS Stock No. 293-8547
Mfr. Part No.FHDM12P5001/S35A
BrandBaumer
MYR1,098.72
Each
units
Block Diffuse 15 300 mm PNP 4-Pin M8 Connector - 30V - LED IP67 100 mA - <1 ms Die Cast Zinc
RS Stock No. 814-0345
Mfr. Part No.OGH500
MYR676.00
Each
units
Barrel Diffuse 15 300 mm PNP M12 Connector - 36V Wire Lead LED IP67 25 mA - - Stainless Steel
RS Stock No. 361-5532
Mfr. Part No.EX-13EA-PN
BrandPanasonic
MYR469.40
Each
units
Block Through Beam (Emitter and Receiver) 500 mm PNP 3-Wire Cable 2m - 24V - LED IP67 50 mA - <=0.5 ms PET
RS Stock No. 488-122
Mfr. Part No.O5H500
MYR923.00
Each
units
Block Diffuse 50 1800 mm PNP M12 Connector - 36V - LED IP67 200 mA - - Polyamide
RS Stock No. 807-4551
Mfr. Part No.EE-SX1103
BrandOmron
MYR8.02
Each
units
Block Diffuse - - - 1.6V - PCB Pin - - 50 mA - 10 μs -
RS Stock No. 753-0371
Mfr. Part No.XUVF250M12
MYR3,358.88
Each
units
Fork Through Beam 6 mm NPN/PNP 4-Pin M12 Connector - 24V - Infrared IP65 100 mA - <0.1 ms Polyamide
RS Stock No. 695-6801
Mfr. Part No.XUB1APANM12
MYR279.24
Each
units
Barrel Retroreflective 4 m PNP 4-Pin M12 Connector - 24V - Infrared IP65, IP67 100 mA - <1 ms PBT
RS Stock No. 394-8999
Mfr. Part No.XUK8AKSNM12
MYR720.70
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Compact Diffuse 1 m NPN/PNP 4-Pin M12 Connector - 24V - Infrared IP30, IP65 100 mA - <=2 ms PC
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