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. 185-2234
Mfr. Part No.FHDM 12P5001
BrandBaumer
$448.05
Each
units
Block Diffuse 15 300 mm PNP 4-Wire Cable 2m - 30V - LED IP67 100 mA - <1 ms Die Cast Zinc
RS Stock No. 399-1943
Mfr. Part No.FHDK 14P5101/S35A
BrandBaumer
$346.69
Each
units
Block Diffuse 20 350 mm PNP 4-Pin M8 Connector - 30V - LED IP67 100 mA - <1 ms PA12
RS Stock No. 339-0003
Mfr. Part No.FPAM 18P3151/S14
BrandBaumer
$271.13
Each
units
Barrel Retroreflective 3.2 m PNP 4-Pin M12 Connector - 30V - LED IP67 200 mA - <1 ms Brass Nickel Plated PC
RS Stock No. 293-8547
Mfr. Part No.FHDM12P5001/S35A
BrandBaumer
$504.15
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. 542-5094
Mfr. Part No.FHDK 07P 6901 KS35A
BrandBaumer
$354.68
Each
units
Block Diffuse 10 60 mm PNP 4-Pin M8 Connector - 30V - LED IP65 100 mA - <0.5 ms Polyamide
RS Stock No. 338-9918
Mfr. Part No.FPDM 16P3921/S14
BrandBaumer
$908.08
Each
units
Block Retroreflective 4 m PNP 4-Pin M12 Connector - 30V - LED IP67 200 mA - <2.5 ms Die Cast Zinc
RS Stock No. 498-1795
Mfr. Part No.FHDK 10P5101
BrandBaumer
$649.98
Each
units
Block Diffuse 20 120 mm PNP 4-Wire Cable 2m - 30V - LED IP65 100 mA - <1 ms ASA
RS Stock No. 370-4200
Mfr. Part No.OHDM 16P5001/S14
BrandBaumer
$1,509.32
Each
units
Block Diffuse 25 300 mm PNP 4-Pin M12 Connector - 30V - Laser Light IP67 200 mA - <0.6 ms Die Cast Zinc
RS Stock No. 530-801
Mfr. Part No.FHDK 04G 6102 KS35A
BrandBaumer
$369.08
Each
units
Block Diffuse 50 mm Push Pull 4-Pin M8 Connector - 30V - LED IP65 50 mA - 0.5 ms ASA
RS Stock No. 815-4174
Mfr. Part No.O300.GP-11110415
BrandBaumer
$326.27
Each
units
Block Diffuse 30 200 mm Push Pull 4-Pin M8 Connector - 30V Cable LED IP67 45 mA - <0.49 ms ASA, PMMA
RS Stock No. 815-4183
Mfr. Part No.O300.RR-11110444
BrandBaumer
$142.46
Each
units
Block Retroreflective 0 4000 mm Push Pull 4-Pin M8 Connector - 30V Cable LED IP67 30 mA - <0.49 ms ASA, PMMA
RS Stock No. 667-0560
Mfr. Part No.FHDK 14P5104/S14
BrandBaumer
$259.64
Each
units
Block Diffuse 30 500 mm PNP 4-Pin M12 Connector - 30V - LED IP67 100 mA - <5 ms ASA, MABS
RS Stock No. 136-5788
Mfr. Part No.OR18.EI-PW1P.71O OR18.TI-ZZZP.71O
BrandBaumer
$145.10
Each
units
Barrel Through Beam (Emitter and Receiver) 13 (Actual) mm, 20 (Nominal) mm PNP 4-Pin M12 Connector - 30V Threaded Infrared IP67 40 (No Load) mA - <2 ms Plastic
RS Stock No. 239-9071
Mfr. Part No.FPDM 16P5105
BrandBaumer
$475.62
Each
units
Block Retroreflective 7.3 m PNP Cable - 30V - LED IP67 200 mA - <1 ms Die Cast Zinc
RS Stock No. 655-666
Mfr. Part No.FZAM 30P5002
BrandBaumer
$510.09
Each
units
Barrel Diffuse 300 1500 mm PNP 4-Wire Cable 2m - 30V - Infrared IP65 100 mA - <2.5 ms Nickel Plated Brass
RS Stock No. 815-4186
Mfr. Part No.O500.GR-11096062
BrandBaumer
$259.64
Each
units
Block Background Suppression 30 600 mm Push Pull 3-Pin M12 Connector - 30V Cable LED IP67 40 mA - <1 ms ASA, PMMA
RS Stock No. 542-5173
Mfr. Part No.FGUM 050P 8001 S35L
BrandBaumer
$518.51
Each
units
Fork Through Beam (Fork) 50 mm PNP 3-Pin M8 Connector - 35V - LED IP67 200 mA - <0.125 ms Die Cast Zinc
RS Stock No. 446-0276
Mfr. Part No.FZDK 10P 5101 S35A
BrandBaumer
$267.31
Each
units
Block Diffuse 5 200 mm PNP 4-Pin M8 Connector - 30V - LED IP67 100 mA - <1 ms ASA
RS Stock No. 123-4134
Mfr. Part No.OADM 20U5460/S14C
BrandBaumer
$2,548.15
Each
units
Block Background Suppression 30 130 mm Analogue 5-Pin M12 Connector - 28V 5-Pin Connector Laser Light IP67 120 mA - <10 ms Die Cast Zinc
RS Stock No. 370-4187
Mfr. Part No.FZAM18P1150/S14
BrandBaumer
$219.26
Each
units
Barrel Diffuse 60 430 mm PNP 4-Pin M12 Connector - 30V - Infrared IP65 200 mA - <1 ms Brass Nickel Plated PC