Basic instrumentation Level Calculation

Hydrostatic Level Transmitter Hydrostatic Level Measurement

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Hydrostatic Level Transmitter Hydrostatic Level Measurement

Hydrostatic Level Measurement Hydrostatic Level Measurement

Hydrostatic Level Transmitter Hydrostatic Level Measurement This method relies on the pressure of the measured liquid head to provide a level indication. The pressure exerted by a column of liquid is equal to the height of the column, h times the specific gravity of the liquid, sg. (P=h⋅(sg), where sg=ρ⋅g). Thus, from this, we can calculate the level of the liquid in a vessel or tank, (i.e. the h) if we know the pressure at the bottom of the tank and the specific gravity of the liquid, sg.


By referring to the figure above, the weight of one cubic foot container of water is seen to be 62.4 pounds (from its weight), and this force is exerted over the surface of the bottom of the container.

Area, A = 12 in × 12 in = 144 in²     (Since 1 ft = 12 in)

Pressure exerted on the area, P = F/A = 62.4 lbs/144 in² = 0.433 lbs/in²

We calculate equivalent level value based on the measured pressure and pressure directly proportional to the level. if pressure increases that means level in the column/tank increase and vice-versa.

How does hydrostatic level measurement work?Hydrostatic Level Transmitter


Hydrostatic Level Transmitter Hydrostatic Level When considering a new level sensor for level measurement applications, it is often hard to find information on how the different types of level sensors, like the hydrostatic level sensors respectively hydrostatic pressure sensors, are working. Recently, I explained level measurement by using hydrostatic pressure measurement

“What does one mean by hydrostatic pressure and hydrostatic level measurement?” But how do you measure the level of water and other liquids using pressure sensors? For use in open geometries such as vented vessels, open reservoirs, and tanks, but also wells and open bodies of water, instrumentation manufacturers such as WIKA offer submersible pressure transmitters, also known as level probes, specifically developed for this purpose. Submersible pressure Hydrostatic Level Transmitter is completely immersed in the liquid that is to be measured.

Hydrostatic Level Transmitter Hydrostatic Level In closed geometries, such as enclosed tanks and vessels, generally, flush pressure sensors or pressure transmitters are used, which can be screwed into the vessel from the outside. Pressure sensors are therefore particularly suitable in applications of free-standing tanks and vessels. A submersible pressure Hydrostatic Level Transmitter (e.g. WIKA model LH-20) or a flush pressure sensor (e.g. WIKA model S-11) measures the height-dependent weight-force of the liquid column, also known as hydrostatic pressure. This pressure measurement is directly proportional to the liquid level respectively liquid column at the measuring point of the pressure sensor. It is, therefore, necessary, for the measurement of level, that the pressure sensor is placed as close as possible to the level of the vessel’s bottom.

Hydrostatic Level Transmitter Hydrostatic Level The measured hydrostatic pressure then directly corresponds to the height of the liquid column from the ground-level measurement point to the surface-level of the medium. So, the filling height is calculated from the distance of the medium surface to the measuring point by the pressure measurement. The weight force of the liquid column, thus the hydrostatic pressure, however, is not only directly proportional to the filling height but also varies with the specific gravity of the medium and the force of gravity. In the next article, I will explain in detail the calculation of the liquid level, especially with reference to the influence of the specific gravity of the medium.

Please find further information on this topic on our information platform “Hydrostatic level measurement

Watch video Hydrostatic Level Transmitter Hydrostatic Level Measurement

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