Gammapilot M FMG60 PROFIBUS PA Commissioning
Endress+Hauser 39
Calibration points for level measurement
A0018111
A Background calibration
B Full calibration
C Empty calibration
Background calibration
Free calibration refers to the following situation:
• The radiation is switched off
• The vessel is filled as much as possible (ideally 100%) within the measuring range
The background calibration is necessary in order to register the natural background radiation
at the mounting position of the Gammapilot M. The pulse rate of this background radiation is
automatically subtracted from all other measured pulse rates. This means that only the part of
the pulse rate which originates from the applied radiation source is displayed and taken into
account during signal analysis. As the background radiation remains virtually constant for the
entire measurement duration (as opposed to the radiation of the source used), background
calibration is not included in automatic decay compensation of the Gammapilot M.
Full calibration
Free calibration refers to the following situation:
• The radiation is switched on
• The vessel is filled as much as possible (ideally 100%, at least 60%) within the measuring
range.
If the vessel cannot be filled to at least 60% during the calibration, the full calibration can
alternatively be performed with the radiation switched off. This is a way of simulating a vessel
that is 100% full. In this case, full calibration is identical to background calibration. As the
pulse rate of the background calibration is automatically subtracted, the pulse rate displayed is
around 0 cps.
This type of simulated calibration is not possible with self-radiating media. In this case,
the vessel must be filled to 100% to perform the background and full calibration.
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