Maintenance
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age 36
5 Maintenance
5.1 Preventive maintenance
Whether maintenance is needed can be checked with the following tests:
Repeatability test (refer to section 4.2).
If repeatability deteriorates (more than 1 mm) the drum bearings should be replaced (refer to section
5.3.3).
Balance test
T
he measuring drum unbalance can be measured by the following procedure:
Item Name Description
LT Lock test Raise the displacer for approximately 0.6 m (2 ft) above the product
level.
FR Freeze Stop the lock test and wait till the displacer is in a complete rest (one
or two minutes).
BT Balance test With this command the balance of the measuring drum is checked.
This measurement takes approximately 5 minutes. When the balance
test is ready, the status on the display changes from BT into FR.
BU Maximum unbalanced Standard floating point format; units: grams.
weight Request for the maximum unbalanced weight.
BV Minimum unbalanced Standard floating point format; units: grams.
weight Request for the minimum unbalanced weight.
UN Unlock Cancel the lock test command.
Calculate the maximum measuring drum unbalance as: (BU - BV).
The drum unbalance should be within 3 grams. When the drum unbalance is more, check for contamination
of the drum. If the unbalance is still more than 3 grams replace the drum bearings (refer to section 5.3.3).
Displacer weight
T
he weight of the displacer can be measured with the following procedure:
Item Name Description
LT Lock test Raise the displacer for approximately 0.6 m (2 ft) above the product
level.
FR Freeze Stop the lock test and wait till the displacer is in a complete rest
(one or two minutes).
MF Measure frequency Measure the frequency of the force transducer. It is ready when the
status on the display changes from MF into FR.
WQ Weight request Standard floating point format; units: grams. Request for the displacer
weight.
UN Unlock Cancel the lock test command.
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