They operate on the principle of communicating vessels, which refers to separate containers that are connected via extrusion outlets to allow low- or high-density fluids of either homogenous or heterogenous consistencies to flow between the vessels.
The chamber, or auxiliary column, of the level gauge is equipped with a float containing a set of permanent magnets. Fluctuations in the fluid of the primary chamber will result in commensurate changes within the level gauge. The magnetic float rises and falls on the surface of the fluid, registering these changes on the external measurement indicator. This indicator is typically constructed using a magnetized shuttle that moves in conjunction with the interior magnets.
This technique is advantageous as it does not require restrictive mechanical guide rails and instead relies on the limited lateral motion of the float within the column of the level gauge. It is also suitable for fluid mixtures of varying densities, with variable float designs and materials suitable for the specific gravity of numerous measured fluids, including acids, butane, oils, water, and heterogenous fluid interfaces.
level gauges are increasingly preferable to alternative level measurement systems owing to their improved thermodynamic resistances over apparatuses such as sight gauges. They can withstand high process temperatures and are optimized for high pressure applications. Unique process demands can also be met using bespoke level gauges with oversized columns and floats with improved buoyant characteristics.
This article comes from ABB edit released