Emerson Rosemount 3308A, Reference Manual

Page: 214 / 226

Environment
Vapor dielectric constant
Enter the dielectric constant (DC) for the vapor gas in the tank. For normal air the vapor DC
is close to 1.
In some applications there is heavy vapor above the product surface having a significant
influence on the level measurement. In such cases the vapor dielectric can be entered to
compensate for this effect.
The default value is equal to 1 which corresponds to the dielectric constant of air. Normally
this value does not need to be changed since the effect on measurement performance is
very small for most vapors.
Max upper product thickness
Configure the maximum possible thickness for the upper product in this tank. This is the
maximum thickness the device will expect for this tank.
Volume
Calculation method
Select method for volume calculation based on tank shape or a strapping table. Strapping
table requires entering level-volume pairs in a table.
Diameter (L1)
The diameter of the tank.
Length (L2)
The length (or height if the tank is shaped as a vertical cylinder) of the tank, measured
between tank ends.
Strapping table
Use a strapping table if a standard tank type does not provide sufficient accuracy. Use
most of the strapping points in regions where the tank shape is non-linear. A maximum of
20 points can be added to the strapping table.
If tank type Strapping Table was chosen, enter how many entries you will use and the
actual level and volume points. The strapping points must be entered such that the first
point corresponds to the lowest level, and the last point corresponds to the topmost level
of the tank.
Configuration parameters Reference Manual
February 2020 00809-0100-4308
214 Rosemount 3308 Series