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System Configuration Manual
300510EN, Rev AA
December 2010
5-57
Rosemount Raptor
Section 5. Installing a Raptor Level Gauging System
c. Minimum Level Distance (C)
The Minimum Level Distance (C) is defined as the distance between
the Zero Level (Dipping Datum Point) and the minimum level (tank
bottom) for the product surface.
By specifying a C-distance the measuring range can be extended to
the bottom of the tank.
C>0: the 5900S presents negative level values when the product
surface is below the Zero Level.
You can use the Show negative level values as zero check box if
you wish to present product levels below the Zero Level (Datum
plate) as equal to zero.
C=0: measurements below the Zero Level will not be approved, i.e.
the RLG will report “invalid level” if the product level is below the
Datum Plate.
12. Enter the Calibration Distance.
Use this variable to adjust the tank height so that measured product
levels match hand dipped levels. Normally a minor adjustment is
necessary when the level gauge is installed. For example, a minor
deviation between the actual tank height and the value stored in the
transmitter database may occur if tank dimensions according to drawings
are not quite up to date with actual dimensions.
For still-pipe applications the Calibrate function in the TankMaster
WinSetup program is a useful tool to configure the Calibration Distance
and the Correction Factor, see “Level Gauge Calibration” on page 5-122
for more information.
13. Click the OK button to save the configuration and close the configuration
window.
In addition to the configuration steps described above, a basic configuration of
the 5900S may include using the Tank Scan function to verify that there are
no disturbing objects in the tank that may interfere with the level
measurements. Also, the Empty Tank Handling function may be used to
optimize measurement performance near the tank bottom.
See “Basic Configuration” in the Rosemount 5900S Reference Manual
(Document No. 300520EN) for more information.
Further configuration options are available in the Tank Shape, Environment,
and Advanced Configuration tabs, see “Advanced Configuration” on
page 5-62.