Prism is key to electro-optic level sensing
A
Gems Sensors product story
Edited by the Engineeringtalk editorial team
Sep 12, 2003
Electro-optic sensors can accurately measure high-pressure liquid processes with very little intrusion into tanks or piping.
Electro-optic sensors can accurately measure high-pressure liquid processes with very little intrusion into tanks or piping.
The technology also has a size and cost advantage over other technologies - such as capacitance, thermal dispersion and conductivity.
Most technologies have limitations on the number of liquids that the sensor can be used in.
Capacitance is limited by the dielectric of the medium, conductivity sensors only work in conductive media and thermal sensors are affected by media that coat and are slow to react to liquid level changes.
Electro-optic sensors, on the other hand, have a broad liquid compatibility.
In "dome-shaped" models, however, there is still a problem with the coating of the lens.
This has been overcome by Gems Sensors' "prism technology".
A major step forward in the development of electro-optic sensing, the prism tip has eliminated the build up of droplet formation and false alarm trips.
The simple solution owes it success to its ergonomic shape, which effectively deflects droplets.
ELS-300 series single-point liquid level switches offer all the benefits of Gems Sensors' prism technology but are also available in customised lengths to 380mm - supplied in 3mm increments.
This allows engineers to provide intermediate liquid level monitoring from a sensor mounted in either the top or bottom of the storage vessel - whereas most conventional electro-optic switches must be installed through the side of a tank.
Compact and economically priced, these switches feature built-in solid-state electronics.
They are also extremely reliable as they have no moving parts.
Repeatability of +/-1mm is provided, and the ELS300 is suitable for operating temperatures from -20 to +100C and pressures up to 10bar(g).
Two forms of electrical termination are available: 300mm of 22AWG, PVC jacketed lead wires, or PVC jacketed cable.
Typical applications include leak detection, medical laboratory, food and beverage systems, pharmaceuticals and hydraulic reservoirs.
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