The level in a closed vessel is calculated by the following formula: h = (p 2 – p 1)/ (ρ * g) p 2 = hydrostatic pressure at depth h p 1= pressure of the enclosed gas in the vessel ρ = density of the liquid g = gravitational force or gravitational acceleration h = height of the liquid column A typical application is measuring the level of a volatile medium such as gasoline in a sealed, non-vented vessel, where an overpressure forms above the liquid, which can’t be compensated by the atmospheric pressure due to the lack of venting. Now, how does one calculate, from the hydrostatic pressure, the filling height of a closed, non-vented or pressurised tank or vessel? In a closed vessel, the pressure measurement is made, primarily, using standard industrial pressure sensors which are mounted at the side of the vessel or tank. Level measurement in closed or pressurised, thus non-vented vessels requires an additional pressure measurement of the enclosed gas by a second pressure sensor. Unlike open vessels, the calculation of level in closed geometries, such as gas-tight tanks or pressurised vessels, requires a compensation of the pressure of the gas enclosed above the liquid with the hydrostatic pressure measurement. Read more Calculate the frequency of each of the following wavelengths of electromagnetic radiation.In a previous blog post, I explained the calculation of the filling height in open geometries and vessels.
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