8 cross-interference calibrations – LumaSense Technologies INNOVA 1314i User Manual
Page 159
Chapter 12
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BE6030-13
1314i Photoacoustic Gas Monitor
LumaSense Technologies A/S
Page 159 of 199
results of the first and second measurements have been
overwritten by the 7
th
and 8
th
measurement results …and so on.
3. Let the Monitor continue measuring the clean, wet air until the
temperature in the cell is stable. Look at the print-out of the
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.
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
Cross-interference Calibrations
If any gas measured by the installed optical filters absorbs light from
more than one of the installed optical filters, then it is advisable to
calibrate for cross-interference (see
). Cross-