Volume Calculation; Advanced Functions; Disturbance Echo Handling - Emerson Rosemount 5600 Series Reference Manual

Reference Manual
00809-0100-4024, Rev CA
4.8

Volume calculation

The Volume Calculation is performed by using one of two methods: predefined tank shape or strapping
table. The strapping table is an optional function. If this function is required, please contact your local
Rosemount representative.
To configure the Rosemount 5600 transmitter for volume calculations you have to choose a Volume
Calculation method.
Select one of the volume calculation methods. Choose one of the ideal tank shape options if
approximation of your tank with an ideal tank shape provides sufficient accuracy. The strapping table
option can be used for an arbitrary tank shape. You can enter levels and corresponding volumes to obtain
a close match between the actual and the calculated volume. This option should be used in cases where
the tank shape deviates significantly from an ideal sphere or cylinder, or when you require high accuracy.
Note
The transmitter is delivered with a code that enables the ordered software options including strapping
table volume calculation. If you wish to change the set of available options, contact your local
Rosemount representative.
Ideal tank
Use this option if approximation of your tank with an ideal tank shape (assuming no dished ends)
provides sufficient accuracy. Enter the following parameters:
Tank Diameter (and the length if it is a horizontal tank).

Volume Offset: Use this parameter if you do not want zero volume and zero level to match (for

example if you want to include volume below the zero level).
Strapping table
Enter levels and corresponding volumes starting at the bottom of the tank. These figures can typically

be obtained from tank drawings or from certificate from the tank manufacturer. If the level//volume
table is based on a reference point that is different from your reference point, you can use Level Offset
and Volume Offset. The Volume Offset is added to every value in the corresponding column.
Select which interpolation method to use for calculating volumes between the strapping points.

Normally, linear interpolation is the preferred method. For spherical tanks, quadratic interpolation may
result in a smaller error. By using linear interpolation and a sufficient number of values in the strapping
table, the interpolation error can normally be reduced to a minimum.
4.9

Advanced functions

In some cases the transmitter must be further configured using the Advanced Functions. Please note this
may affect the previous basic configuration by updating some parameters already set.
4.9.1

Disturbance Echo Handling

There are three methods available for Disturbance Echo Handling:
General Amplitude Threshold

Customized Noise Threshold Table

(Amplitude Threshold Points [ATP] table)
Registration of False Echoes

Configuration
Configuration
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