Chapter 5 Explanations
Mini-Switch LB 471
5.2 Empty Calibration
The shielding container of the measuring system has to be in-
stalled prior to performing empty calibration. The radiation exit
channel has to be open. The container should be empty or filled up
to a level below the limit value.
Empty calibration, especially on high-pressure containers, has to
be carried out under operating conditions (pressure, tempera-
ture).
The following influences have to be taken into account:
Wall deposits
The container has to be emptied thor-
oughly to ensure that no residues are
left in the container.
If wall deposits are likely to build up
during operation, another empty cali-
bration should be carried out after
some time.
Agitator
The agitator has to be in operation if it
may have any influence on the meas-
urement.
Figure 9:
Container with
wall deposits
Figure 10:
Container
with agitator
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