LumaSense Technologies INNOVA 1412i - Manual (Page 171)

Chapter 12
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BE6025-15 1412i Photoacoustic Gas Monitor LumaSense Technologies A/S
Page 171 of 202
2. Let the Monitor continue measuring the span gas A until the
temperature is stable. Look at the print-put of the average and
standard deviation measurements for (1) the water-vapour and
(2) the filter “A”. When these values have stabilised for both
filters, span calibration measurements do not need to continue.
3. Press
¿ .
This causes the following text to appear on the screen:
A : µ : 123.8 μV σ : 617 nV 6 40.4 °C
PRESS ENTER WHEN RESULTS ARE STABLE
These results have been shown on the data-log print-out. If they
have stabilised continue to the next Step.
4. Press ¿ .
The text CALCULATING CALIBRATION FACTORS – PLEASE
WAIT appears on the screen.
The Monitor only uses the last six measurement results when
calculating any calibration factor. The conversion factor (in mg/m3
per volt), which is calculated during a span calibration, is the factor
which allows the Monitor to relate the signal produced by the gas to
the concentration of gas in the cell. The cross-interference
factors, which are calculated during cross-compensation
calibration are those factors which allow the Monitor to compensate
for any interference gas A has on the other installed optical filters.
If any calibration data is doubtful 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 the INFO button.
Chapter 14 lists all the error messages connected with doubtful
calibration results and gives an explanation of their significance so
that the user can ascertain what action to take if such messages are
displayed after calibration.
12.9.3 Use of Nafion Tubing during Span Calibration of
UA0983, UA0984 and UA0985.
A Nafion tubing (an optional accessory) is required during the span
calibration of UA0983 e.g carbon dioxide (CO
2
),UA0984 e.g. carbon
monoxide (CO) and UA0985 e.g. dinitrogen oxide (N
2
O). The Teflon
tubing connected to attachment point no. 3 of the “Y”-piece should