Endress+Hauser Gammapilot M FMG60 - Page 40

Commissioning Gammapilot M FMG60 PROFIBUS PA
40 Endress+Hauser
Empty calibration
Free calibration refers to the following situation:
• The radiation is switched on
• The vessel is emptied as much as possible (ideally 0%, at least 40%) within the measuring
range.
Calibration points for point level detection
A
B
C
ON
OFF
ON
A0018112
A Background calibration
B Covered calibration
C Free calibration
Background calibration
Free calibration refers to the following situation:
• The radiation is switched off.
• The radiation path is completely covered
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. 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.
Covered calibration
Free calibration refers to the following situation:
• The radiation is switched on
• The radiation path is completely covered, where possible
If the radiation path cannot be completely covered during the calibration, the covered
calibration can alternatively be performed with the radiation switched off. This is a way of
simulating a completely covered radiation path. In this case, covered calibration is identical to