SENSseries LB 480 Level measurement
BERTHOLD TECHNOLOGIES GmbH & Co. KG
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Volume 3 7 Explanations
3
7.2 Conditions for Empty Calibration
Empty calibration, particularly for high-pressure containers, must
be conducted under the same conditions as operation (pressure,
temperature). If certain operating conditions cannot be achieved
during the calibration, the calibration must be calculated, or cor-
rected using the appropriate functions (e.g. GDA) in this software.
• For empty calibration, all shielded containers of the measuring
system must be mounted.
• The source shutter must be open.
• The tank should be empty or be filled below 0% of the measur-
ing range.
• If the container is partially filled, e.g. 20%, the lower calibra-
tion point can be adjusted provisionally.
Prerequisite is that you know the exact actual level. In this
case, the value corresponding to this calibration point is to be
entered as the level reading. With this method, however, non-
linearities may cause an error at 0%. Proper empty adjustment
should be conducted as soon as possible.
Wall deposits
The container must be empty and clean without any residues. If
deposits gather along the walls during operation, empty calibration
should be conducted periodically.
For wall deposits a measurement system with a Co-60 source is
less sensitive than one with a Cs-137 source.
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