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. 714-1666
Mfr. Part No.M100/MV100-RT/76a/103/115
TWD4,083.00
Each
units
Block Through Beam (Emitter and Receiver) 10 m PNP Cable - - 30V - LED IP67 100 mA - 0.5 ms
RS Stock No. 908-4035
Mfr. Part No.HG-C1200
BrandPanasonic
TWD18,063.00
Each
units
Block Background Suppression Maximum of 200 mm NPN Cable - - 24V - Laser Light IP67 40 mA @ 24 V dc, 60 mA @ 12 V dc - 10 ms
RS Stock No. 818-1722
Mfr. Part No.EE-SX670-WR 1M
BrandOmron
TWD1,396.00
Each
units
Fork Through Beam (Fork) Maximum of 5 mm NPN - - - 24V Pre-Wired Infrared IP50 35 mA - -
RS Stock No. 219-011
Mfr. Part No.WL100L-E1131
BrandSick
TWD5,548.00
Each
units
Block Retroreflective 0.08 → 12 m NPN Cable - - 30V - Laser Light IP65 100 mA - <0.25 ms
RS Stock No. 326-7240
Mfr. Part No.E3TSL132M
BrandOmron
TWD4,013.00
Each
units
Block Retroreflective 5 → 15 mm PNP Pre-Wired Cable - - 26.4V - LED IP67 50 mA - 1 ms
RS Stock No. 763-7889
Mfr. Part No.VTF18-3F1412
BrandSick
TWD3,826.00
Each
units
Barrel, Elbow Background Suppression 3 100 mm PNP 3-Wire Cable 2m - - 30V - Infrared IP67 100 mA - 2 ms
RS Stock No. 627-6556
Mfr. Part No.OPB704W-Z
BrandOptek
TWD142.00
Each
units
Block Retroreflective 3.8 mm NPN 4-Wire Cable 0.61m - - - - Infrared - - - -
RS Stock No. 170-0724
Mfr. Part No.OPB704W-Z
BrandOptek
TWD136.90
Each (In a Bag of 100)
units
Block Retroreflective 3.8 mm NPN 4-Wire Cable 0.61m - - - - Infrared - - - -
RS Stock No. 530-0866
Mfr. Part No.WTB27-3P2411
BrandSick
TWD9,750.00
Each
units
Block Diffuse 30 → 1600 mm PNP 4-Pin M12 Connector - - 30V - Infrared IP69K 100 mA - <=1.5 ms
RS Stock No. 125-4543
Mfr. Part No.PM-L45
BrandPanasonic
TWD685.00
Each
units
Fork Through Beam (Fork) 6 mm NPN 1m Cable - - 24V Cable Infrared IP64 50 (Sink Current) mA - 20 (Received) μs, 80 (Interrupted) μs
RS Stock No. 617-0672
Mfr. Part No.E3ZLL812M
BrandOmron
TWD5,670.00
Each
units
Block Background Suppression 20 → 300 mm PNP 3-Wire Cable 2m - - 26.4V - LED IP67 100 mA - 1 ms
RS Stock No. 493-7287
Mfr. Part No.WL18-3P430
BrandSick
TWD6,377.00
Each
units
Block Retroreflective 7 m PNP 4-Pin M12 Connector - - 30V - LED IP65, IP67 100 mA - 500 μs
RS Stock No. 741-7613
Mfr. Part No.VTE18-4P4240V
BrandSick
TWD3,702.00
Each
units
Barrel Diffuse 450 mm PNP 4-Pin M12 Connector - - 30V - Infrared IP67, IP68, IP69K 100 mA - <=1 ms
RS Stock No. 134-7064
Mfr. Part No.O300.ER-GW1B.72N O300.TR-ZZZZ.72N
BrandBaumer
TWD3,867.00
Each
units
Block Through Beam (Emitter and Receiver) 10 (Emitter) m, 10 (Receiver) m, 10 (Sb) m, 15 (Emitter) m, 15 (Receiver) m, 15 (Sn) m Push Pull 4-Pin M8 Connector - - 30V 4-Pin Connector LED IP67 40 mA - <0.49 ms
RS Stock No. 134-7065
Mfr. Part No.O300.SP-GW1B.72N
BrandBaumer
TWD6,700.00
Each
units
Block Retroreflective 30 → 300 mm Push Pull 4-Pin M8 Connector - - 30V 4-Pin Connector LED IP67 45 mA - <0.49 ms
RS Stock No. 180-6368
Mfr. Part No.WSE9M4-3P1130
BrandSick
TWD6,541.00
Each
units
Block Through Beam 0 → 10 m PNP 4-Wire Cable - - 30V Cable LED IP66, IP67, IP69K 100 mA - <0.5 ms
RS Stock No. 180-6377
Mfr. Part No.GTE6-P4211
BrandSick
TWD2,607.00
Each
units
Block Diffuse 300 mm PNP 4-Pin M8 Connector - - 30V M8 Male 4-pin Connector LED IP67 100 mA - <1250 ms
RS Stock No. 902-7045
Mfr. Part No.BOS 5K-PU-LH12-S75
BrandBALLUFF
TWD4,877.00
Each
units
Block Background Suppression 20 → 300 mm PNP 4-Pin M8 Connector - - 30V Connector LED IP67 100 mA - 0.25 ms
RS Stock No. 458-840
Mfr. Part No.WTB12-3P2411
BrandSick
TWD8,886.00
Each
units
- - - PNP - - - - - LED IP66, IP67, IP69 - - <=330 μs
RS Stock No. 458-222
Mfr. Part No.E3ZM-V81 2M
BrandOmron
TWD6,745.00
Each
units
Block Diffuse 12 mm PNP Pre-Wired Cable - - 30V - LED IP69K 100 mA - 50 μs