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7 – 682 25.5.09
4 Calibration with FOUNDATION
™
Fieldbus Volume 7
4.4 One-Point Calibration
One-point calibration is used if adjustment of the upper calibration
point is not possible and if complete absorption of the radiation by
a full vessel is not expected. Prerequisite is that the isotope (Co-60
or Cs-137) has already been set up correctly (see page 7–675).
One-point calibration is carried out in five steps:
• Select type of linearization
• Measure background
• Empty calibration
• Full calibration through automatic calculation using the vessel
data.
The necessary steps will be explained in detail on the following
pages and in the proper order.
With this type of calibration inaccurate results may be obtained in
the upper measuring range, since the maximum measuring range
is calculated and not measured. It may happen that upon reaching
the maximum filling level the maximum measuring range (typically
100%) is indicated too early or not at all.
4.4.1 Select the Type of Calibration
Enter 1 at LE_NUMBER_OF_CAL_POINTS to select one-point cali-
bration.
Select the type of linearization for the calibration (see page 7–
677).
Parameters used
LE_CAL_POINT_LO
LE_LEVEL_HI
LE_LEVEL_LO
LE_LIN_DIAMETER
LE_LIN_TYPE
LE_NUMBER_OF_CAL_POINTS
LE_PRODUCT_DENSITY
LE_READ_IN_DATA
LE_READ_IN_TIMEOUT_ACTUAL
LE_READ_IN_STATUS
LE_READ_IN_SENSOR_VALUE
LE_READ_IN_TIMEOUT
LE_SENSOR_OFFSET
LE_START_STOP_READ_IN
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