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System Configuration Manual
300510EN, Rev AA
December 2010
Rosemount Raptor
5-122
Section 5. Installing a Raptor Level Gauging System
5.13 LEVEL GAUGE
CALIBRATION
Normally a minor level gauge adjustment is needed in order to achieve good
agreement between measured and actual product levels. For example, a
deviation may result from minor errors in tank geometry parameters such as
the tank height (R) or the position of the Gauge Reference Point (see the
Rosemount 5900S Radar Level Gauge reference manual, Document No.
300520EN, for more information on tank geometry).
The Rosemount 5900S level gauge can be calibrated by using the Calibration
Distance parameter. It can be manually adjusted in the
5900S Properties/Geometry window, or you may use the Calibrate function to
let WinSetup automatically calculate an optimized Calibration Distance based
on measurement data and hand dipping at different product levels.
NOTE!
For a comprehensive description of how to calibrate a Rosemount 5900S
Radar Level Gauge see the Rosemount 5900S Reference Manual (Document
No. 300520EN).
5.13.1 Manual
Adjustment
A Rosemount 5900S level gauge can be calibrated manually by adjusting the
Calibration Distance parameter
(1)
. By comparing a hand dipped level value
with the product level measured by the level gauge, a Calibration Distance
value can be calculated according to the formula:
New Calibration Distance=Old Calibration Distance+L,
where L=observed level (hand dip) - gauge level reading.
To change the Calibration Distance stored in the gauge database:
1. Select the level gauge icon in the WinSetup workspace.
2. Click the right mouse-button and choose the Properties option.
3. Select the Geometry tab.
4. Type the Calibration Distance value in the corresponding input field and
click the OK button.
See “Installing a Rosemount 5900S Radar Level Gauge” on page 5-51
and the Rosemount 5900S Reference Manual (Document No.
300520EN) for further information.
(1) For non-standard antennas the Tank Connection Length (TCL) may need to be adjusted as
well.