The magnetic level gauge is the instrument to read a level indication in whatever plant or operating condition giving free maintenance, preventive security against leakage, environment al safety, sure and trouble free application with chemically aggressive, pollutant, harmful or poisonous, inflammable or explosive, optically similar fluid interface.
Operating Principle
The principle whereby the liquid in communicating vessel is always at the same level.
Archimede's principle according to which a body immersed in a liquid receives a buoyancy equal to the weight of displaced liquid.
The principle of attraction between north and south pole of two permanent magnets and that of repulsion between like poles.
This Principle Has Two Applications
(1) First between the magnet in the chamber float and every single magnet of the indicating scale
(2) Second between the magnets of the indicating scale
Design
A vertical chamber consisting of a tube of suitable diameter and thickness containing a float where in a permanent magnet is placed exactly on the liquid level line.
Two horizontal stub pipes for connection to the vessel containing the liquid of which we wish to know the level.
Two stop valves (recommended, but not mandatory) one on each stub pipe, to isolate the level gauge.
An indicating scale, outside the vertical chamber, consisting of a case of non-magnetic material with transparent front face containing a set of small permanent magnets enclosed in small cylinders which can rotate on their horizontal axis.
These cylinders show an external surface having two different colors.
According to the orientation of each magnet (due to the action of the magnet in the float) each cylinder will show externally half of its surface of one color or the other.The indicating scale will be of one color (e.g. white) over the chamber area taken up by gas, vapor or steam phase contrasting with the other color (e.g. red) over the chamber area taken up by liquid phase.
