emerson-300510en-users-manual
Emerson Tank Gauging System
Emerson Tank Gauging System
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System Configuration Manual<br />
300510EN, Rev AA<br />
December 2010<br />
Rosemount Raptor<br />
c. Minimum Level Distance (C). The Minimum Level Distance (C) is<br />
defined as the distance between the Zero Level (Dipping Datum<br />
Point) and the minimum level for the product surface (tank bottom).<br />
By specifying a C-distance, the measuring range can be extended to<br />
the bottom of the tank.<br />
C>0: the transmitter presents negative level values when the<br />
product surface is below the Zero Level.<br />
You can use the Show negative level values as zero check box to<br />
present product levels below the Zero Level (Datum plate) as equal<br />
to zero.<br />
C=0: measurements below the Zero Level will not be approved, i.e.<br />
the transmitter will report “invalid level” if the product level is below<br />
the Datum Plate.<br />
15. Enter the Calibration Distance. Use this variable to adjust the tank<br />
height so that measured product levels match hand dipped levels.<br />
Normally a minor adjustment is necessary when the transmitter is<br />
installed. For example, a minor deviation between the actual tank height<br />
and the value stored in the transmitter database may occur if tank<br />
dimensions according to drawings are not quite up to date with actual<br />
dimensions.<br />
16. Select the Show negative level as zero check box to show negative<br />
product levels as zero.<br />
17. Click the Apply button to store the configuration, or click the OK button<br />
to store the configuration and close the window.<br />
See the Rosemount 5400 Reference Manual<br />
(Document No. 00809-0100-4026) for more information on the different tank<br />
geometry parameters.<br />
Section 5. Installing a Raptor Level Gauging System<br />
5-83