LumaSense Technologies 3434i SF6 Leak Detector - Manual (Page 159)

Chapter 12
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BE6028-14 3434i SF6 Leak Detector LumaSense Technologies A/S
Page 159 of 191
average and standard deviation measurements for (1) the water-
vapour and (2) all the other filters. When all these values have
stabilised, calibration measurements do not need to continue.
Continue to the next Step.
4. Press
¿ .
This will cause the results of measurements made with all the
other installed filters to be displayed, for example:
A : µ : 19.34 µV σ : 212 nV 6 39.3°C
PRESS ENTER WHEN RESULTS ARE STABLE
These results have been printed out on the data-log printer. If
they have stabilised continue to the next Step.
5. Repeat step 4 until the signals measured with all the filters have
been displayed, stabilised and been “accepted”.
The text CALCULATING PLEASE WAIT appears on the screen.
The Monitor only uses the last six measurement results when
calculating any calibration factor. The humidity gain factors
calculated during humidity-interference calibration of the filters,
are a measure of the sensitivity of each filter to water-vapour in-
terference.
If any calibration data is uncertain or unacceptable an error message
(marked by an asterisk) will appear on the screen after the
calibration factors have been calculated. Whenever an asterisk is
shown on the screen further information about the condition of the
Monitor can be obtained by pressing INFO.
Chapter 13 lists all the error messages connected with uncertain
calibration results and gives an explanation of their significance so
that you can ascertain what action to take if such messages are
displayed after calibration.
12.8 Span Calibration
Before calculating the conversion factor for a filter (during span
calibration) a concentration offset factor and a humidity gain
factor must be in the filter bank which is selected for the filter
during span calibration. Span calibration of a filter can therefore only
be done after the filter has already been zero-point and humidity-
interference calibrated.