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.


...
Read more Read less

Filters

Viewing 41 - 60 of 1811 products
Results per page
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. 289-0158
Mfr. Part No.VT18-2T1410
BrandSick
TWD4,900.00
Each
units
Barrel Diffuse 2 → 100 mm Triac 4-Pin M12 Connector 253V - - Infrared IP67 300 mA - <=20 ms PBT, PC
RS Stock No. 763-7889
Mfr. Part No.VTF18-3F1412
BrandSick
TWD4,066.00
Each
units
Barrel, Elbow Background Suppression 3 → 100 mm PNP 3-Wire Cable 2m - 30V - Infrared IP67 100 mA - 2 ms Nickel Plated Brass
RS Stock No. 701-8783
Mfr. Part No.WL4S-3F2130V
BrandSick
TWD6,000.00
Each
units
Block Retroreflective 4 m PNP 3-Pin M8 Connector - 30V - LED IP69K 100 mA - <0.5 ms Stainless Steel
RS Stock No. 908-7129
Mfr. Part No.OPB750T
BrandOptek
TWD133.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 627-6556
Mfr. Part No.OPB704W-Z
BrandOptek
TWD129.00
Each
units
Block Retroreflective 3.8 mm NPN 4-Wire Cable 0.61m - - - Infrared - - - - Plastic
RS Stock No. 219-011
Mfr. Part No.WL100L-E1131
BrandSick
TWD6,300.00
Each
units
Block Retroreflective 0.08 → 12 m NPN Cable - 30V - Laser Light IP65 100 mA - <0.25 ms ABS, PMMA
RS Stock No. 891-9501
Mfr. Part No.ML7-8-H-350-IR/59/65a/136/143
TWD6,519.00
Each
units
Block Background Suppression 10 → 350 mm Push Pull 4-Pin M8 Connector - 30V M8 Connector Infrared IP67, IP69K <20 mA - 2 ms PC
RS Stock No. 157-7062
Mfr. Part No.E3JMR4M4TG
BrandOmron
TWD5,454.00
Each
units
Block Retroreflective 4 m Relay 5-Terminal Screw 250V 5V - LED IP66 3 A - 30 ms ABS
RS Stock No. 403-963
Mfr. Part No.GLV18-6-S/59/102/115
TWD1,935.00
Each
units
Barrel Retroreflective 5.5 m NPN Cable - 30V - LED IP67 100 mA - <=1 ms PC
RS Stock No. 908-7110
Mfr. Part No.OPB745
BrandOptek
TWD82.00
Each
units
- - - - - - - - - - - - - -
RS Stock No. 219-2410
Mfr. Part No.EE-SY672
BrandOmron
TWD706.00
Each
units
Block Retroreflective 1 → 5 mm NPN - - 24V - Infrared IP50 100 mA - - PBT
RS Stock No. 741-7613
Mfr. Part No.VTE18-4P4240V
BrandSick
TWD3,935.00
Each
units
Barrel Diffuse 450 mm PNP 4-Pin M12 Connector - 30V - Infrared IP67, IP68, IP69K 100 mA - <=1 ms Stainless Steel
RS Stock No. 908-4035
Mfr. Part No.HG-C1200
BrandPanasonic
TWD17,157.00
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 Acrylic, Die Cast Aluminium
RS Stock No. 125-4543
Mfr. Part No.PM-L45
BrandPanasonic
TWD680.00
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 PBT (Enclosure), Polycarbonate (Display Section)
RS Stock No. 170-0724
Mfr. Part No.OPB704W-Z
BrandOptek
TWD124.40
Each (In a Bag of 100)
units
Block Retroreflective 3.8 mm NPN 4-Wire Cable 0.61m - - - Infrared - - - - Plastic
RS Stock No. 339-0003
Mfr. Part No.FPAM 18P3151/S14
BrandBaumer
TWD3,910.00
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. 818-1621
Mfr. Part No.EE-SX672P
BrandOmron
TWD739.00
Each
units
Fork Through Beam (Fork) Maximum of 5 mm PNP 4-Pin Connector - 24V Connector Infrared IP50 12 mA - - PBT
RS Stock No. 609-0813
Mfr. Part No.XUX1ARCNT16
TWD4,240.00
Each
units
Block Retroreflective 14 m Relay 5-Terminal Screw 240V 240V - Infrared IP65, IP67 3 A, 500 mA - <25 ms PBT
RS Stock No. 493-7287
Mfr. Part No.WL18-3P430
BrandSick
TWD6,600.00
Each
units
Block Retroreflective 7 m PNP 4-Pin M12 Connector - 30V - LED IP65, IP67 100 mA - 500 μs ABS
RS Stock No. 729-5117
BrandRS PRO
TWD3,017.00
Each
units
Barrel Retro-Reflective 0.05 → 7 m PNP Cable - 30V - LED IP67 100 mA - <=0.5 ms Nickel Plated Brass, PC