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Commissioning Radar Tank Gauge
58 Installation and Operations Manual
correction table), the maximum permissible filling speed is 100 mm level
change / min. After this, the fill speed has no limitation.
Function "pipe diam. corr." (032)
For level measurement in stilling wells, radar systems require highly precise pipe inner
diameter data. An mm-exact level measurement cannot be guaranteed for deviations
from the actual stilling well inner diameter of more than ± 0.1mm to the value entered
in the function group "basic setup" (00). The errors which occur as a result are linear and
can be corrected with a dip table containing at least two entries.
The 7500 RTG also has an automatic pipe inner diameter correction. This adjusts the
entered stilling well inner diameter (input in the function group
"basic setup" (00)) to the actual values. However, this presupposes that the value entered
in the function group "basic setup" (00) matches the actual pipe inner diameter
accurately as possible. The user-defined value entered in the function group
"basic setup" (00) can be corrected with this value. In order to do this, switch on the "pipe
diam. corr." (032) function, after a level change of at least 5 m has occurred since start-
up. The pipe diameter, which the instrument determines automatically, will then be
transmitted to the "pipe diameter" (007) function.
Note!
Only if the "pipe diameter" (007) function has changed its value, it is necessary to per-
form a "history reset" (009) and to delete the dip table after activation of the "pipe diam.
corr." (032) function. Otherwise the level change of 5 m has not yet been exceeded. The
"pipe diam. corr." (032) function must be deactivated again and the procedure should be
repeated at a later point of time.
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