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. 729-5148
BrandRS PRO
$176.67
Each
units
Block Diffuse 40 → 1000 mm PNP 4-Pin M12 Connector - - 30V - LED IP67 100 mA - <=2.5 ms
RS Stock No. 729-5145
BrandRS PRO
$169.48
Each
units
Block Retroreflective 0.15 → 10 m NPN 4-Pin M12 Connector - - 30V - LED IP67 100 mA - 2.5 ms
RS Stock No. 729-5126
BrandRS PRO
$158.24
Each
units
Barrel Through Beam (Emitter) 28 m NPN 4-Pin M12 Connector - - 30V - LED IP67 100 mA - <=0.5 ms
RS Stock No. 903-3936
BrandRS PRO
$120.52
Each
units
Fork Through Beam (Fork) 30 mm PNP 4-Wire Cable 2m - - 30V Pre-Wired Infrared IP67 15 mA - 1 ms
RS Stock No. 358-7926
Mfr. Part No.WL260-R270
BrandSick
$223.30
Each
units
Block Retro-Reflective 0.01 → 15 m Relay Cable 240V - 30V - LED IP67 3 A - <=20 ms
RS Stock No. 444-3394
Mfr. Part No.XUB0APSNL2
$213.90
Each
units
Barrel Diffuse, Retro-Reflective, Through Beam (Receiver) 0.12 m, 0.3 m, 2 m, 15 m PNP Cable - - 24V - Infrared IP65, IP67 100 mA - <2 ms
RS Stock No. 493-7316
Mfr. Part No.WF2-40B410
BrandSick
$274.05
Each
units
Fork Through Beam (Fork) 2 mm NPN/PNP 4-Pin M8 Connector - - 30V - Infrared IP65 100 mA - 100 μs
RS Stock No. 818-0299
Mfr. Part No.DS35-B15821
BrandSick
$799.01
Each
units
Block Background Suppression 50 → 3100 mm NPN/PNP 5-Pin M12 Connector - IO-LINK 30V M12 Connector Laser Light IP65, IP67 - IO-Link 2.5 ms, 6.5 ms, 12.5 ms, 24.5 ms, 96.5 ms
RS Stock No. 847-9384
Mfr. Part No.QS18VP6LPQ8
BrandBanner
$177.77
Each
units
Barrel Retroreflective 3.5 m PNP 4-Pin M12 Connector - - 30V - LED IP67 <25 mA - 600 μs
RS Stock No. 778-8713
Mfr. Part No.E3JK-RR12 2M
BrandOmron
$171.83
Each
units
Block Retro-Reflective 6 m, 100 mm Relay Cable 240V - 240V Wire Lead LED IP64 - - 20 ms
RS Stock No. 768-5872
Mfr. Part No.E3FATP21
BrandOmron
$161.72
Each
units
Barrel Through Beam (Emitter and Receiver) 20 m PNP 4-Pin M12 Connector - - 30V - LED IP67, IP69K 40 mA - 0.5 ms
RS Stock No. 770-7008
Mfr. Part No.WL250-2R1531
BrandSick
$276.39
Each
units
Block Retroreflective 0.01 → 15 m Relay 5-Wire Cable 2m 240V - 240V - LED IP67 - - <=15 ms
RS Stock No. 778-8704
Mfr. Part No.E3JK-RR11 2M
BrandOmron
$180.58
Each
units
Block Retroreflective 7 m, 100 mm Relay 5-Wire Cable 2m 240V - 240V Wire Lead LED IP64 - - 20 ms
RS Stock No. 764-3893
Mfr. Part No.QS186LEQ8
BrandBanner
$170.64
Each
units
Block Through Beam (Emitter) 15 m - 4-Pin Connector - - 30V - LED IP67 100 mA - 750 μs
RS Stock No. 289-2491
Mfr. Part No.WL150-P430
BrandSick
$162.40
Each
units
Block Retro-Reflective 2.4 m PNP 4-Pin M8 Connector - - 30V - LED IP67 100 mA - <=0.5 ms
RS Stock No. 768-5932
Mfr. Part No.E3FADP132M
BrandOmron
$107.89
Each
units
Barrel Diffuse 1 m PNP Pre-Wired Cable - - 30V - LED IP67, IP69K 25 mA - 0.5 ms
RS Stock No. 360-0451
Mfr. Part No.WT24-2R210
BrandSick
$502.42
Each
units
- - - Relay - - - - - LED IP69 - - <=10 ms
RS Stock No. 816-0361
Mfr. Part No.E3FCLP22
BrandOmron
$161.72
Each
units
Barrel Diffuse 200 mm PNP M12 Connector - - 30V Cable LED IP67, IP68, IP69K 25 mA - 0.5 ms
RS Stock No. 288-9805
Mfr. Part No.WT150-P460
BrandSick
$197.92
Each
units
Block Diffuse 2 → 100 mm PNP 4-Pin M8 Connector - - 30V - LED IP67 100 mA - <=0.5 ms
RS Stock No. 768-5881
Mfr. Part No.E3FARP21
BrandOmron
$114.00
Each
units
Barrel Retro-Reflective 0.1 → 4 m PNP 4-Pin M12 Connector - - 30V - LED IP67, IP69K 25 mA - 0.5 ms
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