Environment; Tank Shape - Emerson Rosemount 5900 Reference Manual

Rosemount 5900 Series
4.3.2

Environment

4.3.3

Tank Shape

4-6
Preliminary
Pipe Diameter
When a Rosemount 5900 level gauge is installed in a still pipe, the inner
diameter of the pipe must be specified. The Pipe Diameter is used to
compensate for the lower microwave propagation speed inside the pipe. An
incorrect value results in a scale factor error. If locally supplied still pipes are
used, make sure the inner diameter is noted before the pipe is installed.
Foam
You can use this parameter to optimize the gauge for conditions with weak
and varying surface echo amplitudes such as foam. When the foam is light
and airy the actual product level is measured. For heavy and dense foam the
transmitter measures the level of the upper surface of the foam.
Turbulent Surface
Splash loading, agitators, mixers, or boiling products may cause a turbulent
surface. Normally the waves in a tank are quite small and cause local rapid
level changes. By setting the Turbulent Surface parameter the performance of
the transmitter will be improved when there are small and quickly changing
amplitudes and levels.
Rapid Level Changes
Optimize the level gauge for measurement conditions where the level
changes quickly due to filling and emptying of the tank. The Rosemount 5900
is able to track level changes of up to 1.5 inch/s (40 mm/s). The Rapid Level
Changes funtion allows the 5900 to track level changes of up to 8 inch/s (200
mm/s).
The Rapid Level Changes function shall not be used in normal conditions
when the product surface moves slowly.
Solid Products
Setting this parameter optimizes the transmitter for solid products, for
example concrete or grains, which are not transparent for radar signals. For
instance, this parameter can be used when the application is a silo with
product build-up.
Product Dielectric Range
The Dielectric Constant is related to the reflectivity of the product. This
parameter can be used to optimize measurement performance. However, the
level gauge will still be able to perform well even if the actual Dielectric
Constant differs from the configured value.
The Tank Type and Tank Bottom Type parameters optimize the Rosemount
5900 for various tank geometries and for measurements close to the tank
bottom.
Reference Manual
300520EN, Rev AA
November 2009
Section 4. Configuration