Gammapilot M FMG60 FOUNDATION Fieldbus
Commissioning
Hauser
67
to background calibration. As the pulse rate of the background calibration is automatically
subtracted, the pulse rate displayed is around 0 c/s.
This type of simulated calibration is not possible with self-radiating media. In this
case, the radiation path must be completely covered to perform the background
calibration and the covered calibration.
Free calibration
Free calibration refers to the following situation:
• The radiation is switched on
• The radiation path is completely free
Methods for entering the calibration points
Automatic calibration
For an automatic calibration, the vessel is filled to the required value. The radiation
remains switched off for background calibration, while radiation is switched on for all
other calibration points. The Gammapilot M records the pulse rate automatically. The
associated level is entered by the user.
Manual calibration
If one or more calibration points cannot be implemented during the commissioning of the
Gammapilot M (e.g. because the vessel cannot be sufficiently filled or emptied), this
calibration point must be entered manually. This means that both the level and the
associated pulse rate must be entered directly. Please contact Hauser Service for
any questions regarding the calculation of the pulse rate.
Calibration date and calibration
• The calibration date is not set automatically during manual calibration. It must be
entered by the user in the
"Calibration date" (*C7)
function.
• A calibration point entered manually should be replaced by an automatic calibration
as soon as the associated level occurs during the operation of the plant. This
recalibration is advisable because calibration points entered automatically result in
more precise measurement results than calculated ones.
7.4.2
Background calibration
Excerpt from the operating menu
The following excerpt from the operating menu illustrates the entries to be made for
background calibration. The individual functions are explained in detail in the sections that
follow.
*10
backgr. calibr.
0: stop/ edit
1: start
*11
avg. pulse rate
*12
bgr. pulse rate
-1: not calibrated
0
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