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7
Calibration from the host controller
The calibration procedures included in this section fine-tune the level measurement and the calculation of the gross volume of
the tank. The procedures are required to account for field variations in fluid and tank properties.
IMPORTANT NOTE: Perform the calibration procedures included in this section when connecting the
LevelMaster(s) to a flow computer or controller. When the host controller is part of the installation scenario,
calibration data is kept in the audit trail.
Calibration for level measurement (level bias)
Although the LevelMaster is a highly accurate factory-calibrated device, there can be subtle discrepancies that may require the
floats to be calibrated in the field. Discrepancies such as the specific gravity of the fluid being slightly different than what the float
was calibrated for, may cause the float to sit slightly higher or lower in the fluid, resulting in less precision in the measurement
reading.
Calibrating the float in the field in this case is done by determining a new level factor and making a positive or negative
adjustment to the level. This is called a bias.
If the user has been manually gauging the levels and is confident that the measurements are accurate, determine the need to
set a bias by comparing the reading level of each float as indicated by the LevelMaster application to that of an actual
measurement. If the level(s) differ, the user can enter the manually measured levels to generate the calibration offset values.
IMPORTANT NOTE: While calibration for level measurement by adding level biases is also available from the
MasterLink, it is recommended that level calibration be performed from the host controller and not the MasterLink.
To add level bias at the host controller:
1.
On the navigation tree, expand Tank Data.
2.
Select the Levels tab (Figure 56).
LevelMaster 7100 User manual 2105835 Rev AA | 62
Figure 56: Adding level bias from PCCU
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Troubleshooting
