LumaSense Technologies INNOVA 1314i - Manual (Page 162)

Chapter 12
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BE6030-13 1314i Photoacoustic Gas Monitor LumaSense Technologies A/S
Page 162 of 199
Type of Span Calibration – Single-point or Two-point?
Fig.12.15a Graph showing a non- linear span-calibration curve which can
be plotted using the signals measured during a two-point span
calibration task
Fig.12.15b Graph showing a non- linear measurement curve
The question about whether to perform a single- or a two-point span
calibration is difficult to answer, as it is dependent on how linear the
relationship is between a gas’s concentration and the signal it
produces in the cell (see Fig.12.14 , Fig.12.15a and Fig.12.15b ).
However, we can give you some guidelines on whether you have to
perform a single- or a two-point span-calibration.