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 Switching Mode Maximum AC Voltage Communication Protocol Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface
RS Stock No. 542-5094
Mfr. Part No.FHDK 07P 6901 KS35A
BrandBaumer
MYR877.55
Each
units
Block Diffuse 10 → 60 mm PNP 4-Pin M8 Connector - - - 30V - LED IP65 100 mA -
RS Stock No. 293-8547
Mfr. Part No.FHDM12P5001/S35A
BrandBaumer
MYR899.58
Each
units
Block Diffuse 15 → 300 mm PNP 4-Pin M8 Connector - - - 30V - LED IP67 100 mA -
RS Stock No. 815-4170
Mfr. Part No.O300.GR-11110414
BrandBaumer
MYR693.39
Each
units
Block Diffuse 30 → 300 mm Push Pull 4-Pin M8 Connector - - - 30V Cable LED IP67 45 mA -
RS Stock No. 815-4174
Mfr. Part No.O300.GP-11110415
BrandBaumer
MYR920.81
Each
units
Block Diffuse 30 → 200 mm Push Pull 4-Pin M8 Connector - - - 30V Cable LED IP67 45 mA -
RS Stock No. 542-5145
Mfr. Part No.FPDK 20P 5101 S35A
BrandBaumer
MYR613.19
Each
units
Block Retroreflective 4.5 m PNP 4-Pin M8 Connector - - - 30V - LED IP67 100 mA -
RS Stock No. 339-0003
Mfr. Part No.FPAM 18P3151/S14
BrandBaumer
MYR780.43
Each
units
Barrel Retroreflective 3.2 m PNP 4-Pin M12 Connector - - - 30V - LED IP67 200 mA -
RS Stock No. 446-0282
Mfr. Part No.OHDK 14P5101/S35A
BrandBaumer
MYR1,993.09
Each
units
Block Diffuse 20 → 350 mm PNP 4-Pin M8 Connector - - - 30V - Laser Light IP67 100 mA -
RS Stock No. 185-2212
Mfr. Part No.FHDM 16P5001/S14
BrandBaumer
MYR1,434.78
Each
units
Block Diffuse 20 → 450 mm PNP 4-Pin M12 Connector - - - 30V - LED IP67 200 mA -
RS Stock No. 338-9980
Mfr. Part No.FZAM 18P6460/S14
BrandBaumer
MYR828.45
Each
units
Barrel Diffuse 60 → 430 mm PNP 4-Pin M12 Connector - - - 30V - Infrared IP67 200 mA -
RS Stock No. 418-5672
Mfr. Part No.OZDK 10P5101/S35A
BrandBaumer
MYR2,077.13
Each
units
Block Diffuse 3 → 150 mm PNP 4-Pin M8 Connector - - - 30V - Laser Light IP67 100 mA -
New
RS Stock No. 210-0698
Mfr. Part No.O200.EL-GW1J.72NV/FREC
BrandBaumer
MYR876.12
Each
units
Rectangular Through Beam 6 mm Push Pull Flylead Connector M8 4 Pin - - - - - - - - -
New
RS Stock No. 210-0703
Mfr. Part No.O200.RL.T-GW1J.72NV/FIN1
BrandBaumer
MYR1,043.00
Each
units
Rectangular Retro-Reflective 1.2 mm Push Pull Flylead Connector M8 4 Pin - - - - - - - - -
New
RS Stock No. 210-0699
Mfr. Part No.O200.GL-GW1J.72NV/E022_F060
BrandBaumer
MYR1,066.84
Each
units
Rectangular Background Suppression 132 mm Push Pull Flylead Connector M8 4 Pin - - - - - - - - -
New
RS Stock No. 210-7833
Mfr. Part No.OADM 13I6475/S35A
BrandBaumer
MYR8,379.76
Each
units
Rectangular Background Suppression 350 mm Analogue Connector M8 4 Pin - - - - - - - - -
New
RS Stock No. 210-0708
Mfr. Part No.O200.TL-GZZY.72NV/FIN2
BrandBaumer
MYR715.20
Each
units
Rectangular Through Beam 6 mm Emitter Flylead Connector M8 4 Pin - - - - - - - - -
New
RS Stock No. 210-0700
Mfr. Part No.O200.GL-GW1J.72NV/F040
BrandBaumer
MYR1,019.16
Each
units
Rectangular Background Suppression 132 mm Push Pull Flylead Connector M8 4 Pin - - - - - - - - -
RS Stock No. 542-5139
Mfr. Part No.FHDK 20P 6901 S35A
BrandBaumer
MYR720.31
Each
units
Block Diffuse 30 → 200 mm PNP 4-Pin M8 Connector - - - 30V - LED IP67 100 mA -
New
RS Stock No. 210-7838
Mfr. Part No.OADM 20I5560/S14C
BrandBaumer
MYR7,068.56
Each
units
Rectangular Background Suppression 130 mm Analog PNP Connector M12 5 Pin - - - - - - - - -
New
RS Stock No. 210-7834
Mfr. Part No.OADM 13I7480/S35A
BrandBaumer
MYR8,379.76
Each
units
Rectangular Background Suppression 550 mm Analogue Connector M8 4 Pin - - - - - - - - -
RS Stock No. 815-4199
Mfr. Part No.O500.RR-11096091
BrandBaumer
MYR463.49
Each
units
Block Retroreflective 0 → 8 m Push Pull 3-Pin M12 Connector - - - 30V Cable LED IP67 40 mA -