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System Configuration Manual
300510EN, Rev AA
December 2010
5-83
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 for the product surface (tank bottom).
By specifying a C-distance, the measuring range can be extended to
the bottom of the tank.
C>0: the transmitter 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 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 transmitter will report “invalid level” if the product level is below
the Datum Plate.
15. 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 transmitter 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.
16. Select the Show negative level as zero check box to show negative
product levels as zero.
17. Click the Apply button to store the configuration, or click the OK button
to store the configuration and close the window.
See the Rosemount 5400 Reference Manual
(Document No. 00809-0100-4026) for more information on the different tank
geometry parameters.