Magnetic level gauge consists of a float, carrying a set of strong permanent magnets, riding in an external tube (Float Chamber) attached to the vessel by two nozzles.
As the float moves up and down along with liquid level, a magnetized shuttle or bar graph indication moves with it, indicating the position of the float and thus providing the level indication.
Auxiliary column and chamber walls are made of non-magnetic material, mostly exotic materials like Hastelloy C-276 or engineered plastics.
- Float designs can be optimized for the specific gravity of the fluid being measured, whether butane, propane, oil, acid, water, or interfaces between two fluids, as well as a large selection of float materials.
- They can handle high temperatures, high pressures, and corrosive fluids.
- Oversized float chambers and high-buoyancy floats are available for applications where buildup is anticipated.
- Steam jacketing can be used for Liquid Asphalt.
- Oversizes chambers can be used for Flashing conditions.
- Cryogenic temperature designs can be used for liquid nitrogen and refrigerants.
- Titanium, Incoloy, and Monel are available for varying combinations of high-temperature, high-pressure, low-specific-gravity, and corrosive-fluid applications.
Check out these youtube videos to better understand it.