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LEVELtrol-II Installation & Operating Instructions
7.5 Computation of Corrected Volume in Tank and Mass in Tank
The mass in the tank can be computed if the volume in the tank and the density are
known. This instrument has menu selections which permit the user to compute and
view the quantity in the tank in mass units.
Corrected Volume is the equivalent volume the liquid would occupy at some
reference condition. This instrument also provides menu selections which permit the
user to compute and view the quantity in the tank in corrected volume units. This is
often useful in determination of volume in the tank for petroleum quantities when it is
desired to know the volume the liquid would occupy at 60 F. (Remember that when
the temperature of the material is changing and the actual volume of the material
in the tank is changing with that temperature based on the expansion factor for the
liquid.).
LEVELtrol II Equations Summary
Level_Sensor = % • (Level_fs-Level_zero) + Level_zero
Temperature = % • (Tfs - Tzero) + Tzero
Density = % • (Dfs - Dzero) + Dzero
Density = Dref • (1 - c•1e-6 • (Tf - Tref))
2
(if inferred by temp & fluid properties)
h = height above sensor = Level_Sensor • Volume_Conv_Factor/ Df
(if hydrostatic)
Tank_Level = h + Sensor_Offset
Volume_Total = Volume(Tank_Level, Tank_Geometry)
Avail_Volume = Volume_Total -Volume(Discharge_Pt, Tank Geometry)
Mass Total = Volume Total • Density
Corrected Volume = Volume Total • (1 - c•1e-6 • (Tf - Tref))
2
NOTE: Consult factory for applications requiring other fluid equations.
