Gammapilot M FMG60 PROFIBUS PA Commissioning
Endress+Hauser 41
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 Endress+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.
6.5.2 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.
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