An alternative is to mount a conventional pressure measuring instrument as close as possible to the bottom on the exterior of the tank.īoth ways, the prevailing hydrostatic pressure and therefore the level or contents of the tank derived therefrom can be measured.
Submersible transmitters or level probes are pressure measuring instruments which are submersed into a liquid to measure the pressure prevailing on the bottom of the tank. To measure the hydrostatic pressure, so-called submersible transmitters or level probes, have been especially designed for this purpose. Thus, for example, the pressure in a water tank becomes 100 mbar higher, compared to the pressure on the water surface, for every metre of water depth. The hydrostatic pressure under a static liquid column increases directly with the height of the liquid column. The level of a liquid such as water or oil in a tank or vessel can be measured indirectly by means of the hydrostatic pressure of the so-called “liquid column”.
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