Endress+Hauser Gammapilot FMG50 - 7.2.4 Calibration Types

Gammapilot FMG50 Commissioning
Endress+Hauser 51
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WARNING
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If the incorrect beam type or isotope is selected, the Gammapilot FMG50 will output an
incorrect measured value. This would be a dangerous undetected failure. It is not
permitted to change the setting in the operating menu.
The type of isotope and beam can only be set once. It is only possible to change the
setting by resetting the device to the factory setting, see Section 6.4.
7.2.4 Calibration
Background calibration
The background calibration is necessary in order to record the natural background
radiation at the mounting position of the Gammapilot FMG50. The pulse rate of this
background radiation is automatically subtracted from all other measured pulse rates. Only
the part of the pulse rate which originates from the radiation source used is taken into
consideration.
In contrast to the radiation of the source used, the background radiation remains more or
less constant for the entire duration of the measurement. For this reason, background
calibration is not factored into the automatic decay compensation of the Gammapilot
FMG50.
1. Select the isotope and the beam type
2. Switch off radiation (source housing set to the "off" position) or fill vessel to the
maximum level.
3. Press the "Start background calibration" button
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The measurement then starts automatically and continues, at the very maximum,
for as long as has been configured for the calibration time. However, the process
can also be stopped manually by pressing the "Stop calibration" button.
The calibration stops automatically as soon as a million pulses have been
totalized.
Alternatively, the background value can also be entered directly.
For the "Next" button in the Wizard to be enabled, the value must, however, be
changed from the start value, at least temporarily.
In the case of radiating media, the calibration of the background radiation must be
performed at the lowest possible radiation (ideally: without a medium)
Point level calibration
Depends on the operating mode selected.
For a point level measurement, the Gammapilot FMG50 requires two other calibration
points in addition to the background calibration:
• Empty calibration
• Full calibration