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. 542-5094
Mfr. Part No.FHDK 07P 6901 KS35A
BrandBaumer
HK$1,468.97
Each
units
Block Diffuse 10 → 60 mm PNP 4-Pin M8 Connector - - 30V - LED IP65 100 mA - <0.5 ms
RS Stock No. 815-4174
Mfr. Part No.O300.GP-11110415
BrandBaumer
HK$1,624.48
Each
units
Block Diffuse 30 → 200 mm Push Pull 4-Pin M8 Connector - - 30V Cable LED IP67 45 mA - <0.49 ms
RS Stock No. 399-1959
Mfr. Part No.FPDK14P5101/S35A
BrandBaumer
HK$988.51
Each
units
Block Retroreflective 7.2 m PNP 4-Pin M8 Connector - - 30V - LED IP67 100 mA - <1 ms
RS Stock No. 418-5672
Mfr. Part No.OZDK 10P5101/S35A
BrandBaumer
HK$3,695.12
Each
units
Block Diffuse 3 → 150 mm PNP 4-Pin M8 Connector - - 30V - Laser Light IP67 100 mA - <0.05 ms
RS Stock No. 655-666
Mfr. Part No.FZAM 30P5002
BrandBaumer
HK$2,539.68
Each
units
Barrel Diffuse 300 → 1500 mm PNP 4-Wire Cable 2m - - 30V - Infrared IP65 100 mA - <2.5 ms
RS Stock No. 187-1806
Mfr. Part No.O200.GP-GW1J.72NV
BrandBaumer
HK$1,505.75
Each
units
Rectangular Background Suppression 3 → 132 mm Push Pull 4 Pin M8 Connector - IO-LINK 30V M8 Connector - IP67 <50 mA IO-Link <0.25 ms
RS Stock No. 187-1807
Mfr. Part No.O200.GR.F-PV1Z.72NV/BX15
BrandBaumer
HK$1,195.41
Each
units
Rectangular Background Suppression 3 → 15 mm PNP 4 Pin M8 Connector - - 30V M8 Connector - IP67 <50 mA - <1 ms
RS Stock No. 667-0585
Mfr. Part No.OPDK 14P5901/S14
BrandBaumer
HK$2,959.76
Each
units
Block Retroreflective 10 m PNP 4-Pin M12 Connector - - 30V - Laser Light IP67 100 mA - <0.25 ms
RS Stock No. 667-0560
Mfr. Part No.FHDK 14P5104/S14
BrandBaumer
HK$1,292.72
Each
units
Block Diffuse 30 → 500 mm PNP 4-Pin M12 Connector - - 30V - LED IP67 100 mA - <5 ms
RS Stock No. 187-1808
Mfr. Part No.O200.GR-GD1E.72NV/T007
BrandBaumer
HK$1,195.41
Each
units
Rectangular Background Suppression 7 → 80 mm Push Pull 4 Pin M8 Connector - - 30V M8 Connector - IP67 <50 (Output) mA - <1 ms
RS Stock No. 136-5800
Mfr. Part No.OR18W.ZI-PW1P.9VO/B013
BrandBaumer
HK$793.11
Each
units
Barrel Diffuse 0 → 300 mm PNP 4-Pin M12 Connector - - 30V Threaded Infrared IP67, IP69K 40 (No Load) mA - <1 ms
RS Stock No. 187-1816
Mfr. Part No.OM70-L0070.HH0065.VI
BrandBaumer
HK$18,310.42
Each
units
Rectangular Distance 30 → 70 mm Analogue 8 Pin M12 Connector - - 28V M12 Connector - IP67 <100 (Output) mA - 0.8 ms
RS Stock No. 187-1810
Mfr. Part No.O200.ER-GD1E.72NV/T003
BrandBaumer
HK$919.54
Each
units
Rectangular Through Beam 6 m Push Pull 4 Pin M8 Connector - - 30V M8 Connector - IP67 <50 (Output) mA - <0.5 ms
RS Stock No. 542-5173
Mfr. Part No.FGUM 050P 8001 S35L
BrandBaumer
HK$2,563.02
Each
units
Fork Through Beam (Fork) 50 mm PNP 3-Pin M8 Connector - - 35V - LED IP67 200 mA - <0.125 ms
RS Stock No. 123-4136
Mfr. Part No.OADM 20I6460/S14F
BrandBaumer
HK$11,195.45
Each
units
Block Background Suppression 30 → 130 mm Analogue 8-Pin M12 Connector - - 28V 8-Pin Connector Laser Light IP67 120 mA - <0.9 ms
RS Stock No. 187-1815
Mfr. Part No.OM70-P0140.HH0130.VI
BrandBaumer
HK$18,310.42
Each
units
Rectangular Distance 40 → 140 mm Analogue 8 Pin M12 Connector - - 28V M12 Connector - IP67 <100 (Output) mA - 0.8 ms
RS Stock No. 136-5790
Mfr. Part No.OR18.GR-PW1P.71O
BrandBaumer
HK$942.53
Each
units
Barrel Diffuse 5 → 120 mm PNP 4-Pin M12 Connector - - 30V Threaded LED IP67 40 (No Load) mA - <1 ms
RS Stock No. 187-1817
Mfr. Part No.OM70-P0250.HH0240.VI
BrandBaumer
HK$18,310.42
Each
units
Rectangular Distance 50 → 250 mm Analogue 8 Pin M12 Connector - - 28V M12 Connector - IP67 <100 (Output) mA - 0.8 ms
RS Stock No. 530-762
Mfr. Part No.FHDK 04G 6101 KS35A
BrandBaumer
HK$1,381.61
Each
units
Block Diffuse 30 mm Push Pull 4-Pin M8 Connector - - 30V - LED IP65 50 mA - 0.5 ms
RS Stock No. 370-4193
Mfr. Part No.OZDM16P1001/S14
BrandBaumer
HK$3,704.61
Each
units
Block Diffuse 250 mm PNP 4-Pin M12 Connector - - 30V - Laser Light IP67 200 mA - <0.05 ms