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6 Explanations Volume 7
6.3.1 Exponential One-Point Calibration
If the tank cannot be completely filled after operation has started,
then a one-point calibration can be performed. To this end, enter
an absorption path and product density. Then an empty calibration
is performed for which the initial level value is entered as a per-
centage and the corresponding count rate is entered. For full cali-
bration, only the final level value is to be entered. The count rate
has already been calculated automatically from the absorption
coefficient.
Figure 6-6 One-point calibration
The absorption coefficient is automatically calculated using follow-
ing formula
for Co-60: a1 = 0.0044 x r x AP
for Cs-137: a1 = 0.006 x r x AP
ρ
= vessel filling density in g/cm
3
AP = absorption path in mm
absorption
path
+
Empty Full
Enter:
Product density
and
absorption path
Max.
Min.
Measuring Range
Absorbtion Path
Point Source
Point Detector
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