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Service Manual
Third edition, June 1997
5.8 Trim/List Unit, LT
A unit with inclinometers for measuring trim and list is
integrated in the Level Unit cabinet. These trim and list
values are used to support the radar echo detection process
that finds the true ullage. These values can also be used for
ullage correction if there are no better source of trim and list
values available.
The trim an list values are used in the LCM or LCMs to
calculate trim/list corrected ullages. The trim and list values
are normally measured by the Trim/List Unit in the Level
Unit, but they can also be measured and calculated using
draft sensors or from communication with another system.
Both the uncorrected and the corrected ullage values are
available for presentation on the Work Station, Backup Dis-
play or Local Displays. By setting the ullage correction in the
Setup-window on the Work Station, the same correction is
presented on all displays. The trim/list correction can also be
set in the T/L Mode-frame by pressing the System-key on the
Backup Display’s keyboard. See Operating Manual.
5.8.1 Replacing the Trim/List Unit
The Trim/List Unit is mounted to the back plane inside the
Level Unit, below the Calculation Unit.
1. Switch system off
2. Disconnect the connector from the Calculation Unit’s
backplane.
3. Remove the Trim/List Unit.
4. Replace with new Trim/List Unit. Tighten nuts and
connect to backplane.
Note: Mechanical adjustment was introduced in October
1995 as a complement to the electronics adjustment. Preset
the Trim/List Unit using the adjustment screws on the
mounting plate.
5. Adjust the Trim/List Unit according to the instructions
below.