LumaSense Technologies INNOVA 1412i - Manual (Page 163)

Chapter 12
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BE6025-15 1412i Photoacoustic Gas Monitor LumaSense Technologies A/S
Page 163 of 202
Fig.12.14 Curve showing a linear span-calibration curve
Choosing a filter bank
If a filter (e.g. “A”) has already been calibrated to measure a gas
(e.g. A1) and you wish to calibrate with gas A1 again, then select the
filter bank containing the gas conversion factor for gas A1. Online
users can do this when downloading the calibration factors. Stand-
alone users should do this before setting-up and performing the span
calibration task. The gas conversion factor calculated during the
span calibration will then just overwrite the gas conversion factor
calculated during the previous span calibration of the filter with this
gas.
If you wish to span calibrate a filter to measure more than one gas,
then select a new filter bank each time you span calibrate with a
different gas. In this way the conversion factor for each gas is
stored in separate filter banks (for stand-alone uses see Fig.12.9 ).
The gas conversion factor stored in the selected filter bank during
a span calibration task will be overwritten by the new gas
conversion factor calculated during the span calibration of the
filter.