Working principle of magnetic flap level gauges and float level gauges

The magnetic flap level gauge is a direct-reading level instrument with an on-site installed transmitter unit, where the sensing part and the display part are completely separated from each other. When the liquid level in the container being measured changes on site, the magnetic float inside the main tube of the level gauge rises and falls accordingly. The permanent magnet contained within the float transmits a magnetic signal to the on-site indicator through magnetic coupling, thereby causing the red and white flip columns to rotate; when the liquid level rises, the flip columns change from white to red ； As the liquid level drops, the flip column changes from red to white. The point where the red and white parts of the indicator meet indicates the actual height of the liquid level inside the container. The float level gauge is a level measurement instrument designed based on Archimedes’ principle and magnetic coupling. It can be used to measure liquid levels, interface levels, and density, and it is responsible for generating alarm signals for upper and lower limit conditions. Designed specifically for measuring the liquid level in pressure vessels, it consists of four basic components: a float, a spring, a magnet chamber, and an indicator. 　　A float level gauge is based on the principle of displacement measurement; a displacement cylinder suspended from a measuring spring is immersed in the liquid to be measured, and it experiences an upward buoyant force according to Archimedes’ principle, with this force being proportional to the mass of the liquid displaced. Depending on the liquid level, the depth of immersion of the cylinder changes, which in turn alters the upward buoyant force; the measuring spring extends accordingly to obtain the measurement result.

Well, to put it that way, wherever magnetic flip switches can be used for measurement, floats can also be used for that purpose. However, in areas measured with buoys, magnetic flip plates may not be able to provide measurements. This is related to various factors such as the density of the process medium, measurement accuracy, and pressure. Of course, it also has something to do with the price of the instrument. Under the same operating conditions and with the same brand, float type levels are much more expensive than magnetic flap types. Just by looking at the amount of money, you can tell where the difference lies.

The float you mentioned should be called a sinker, right?

Images look more intuitive.

What kind of media is generally used for float level gauges?

The answer is very detailed; I’ve learned from it, thank you!