INFICON
Software Operation | 9
074-594-P1H Micro GC Fusion Operating Manual
223 / 319
9.10.10.6 Second Level Calibration
If a second level calibration is required, a calibration gas standard of different
concentration levels must be run using the same analytical method as the first level
calibration. A multi-point calibration utilizes multiple data points from runs of the
different calibration gas cylinders. The plot of area count (μV) versus concentration
(mol% or ppm) will be used to calculate the concentration of an unknown amount of
the calibrated compound.
1 Calibrate a single level by following Single Level Calibration [
213].
2 Introduce a second level calibration gas.
3 Conduct an analysis of the second level calibration gas. INFICON recommends
conducting multiple runs of each calibration gas and using the last run to perform
the calibration. Doing so thoroughly purges the sample path with the calibration
gas, which ensures the best calibration accuracy.
4 In the data browser, select the data file for the calibration gas corresponding to
the second level.
5 Click the icon to enter the calibration window.
6 By default, Module A will display.
7 Click and a window is displayed. Select Add new level to calibration. Click the
icon.
8 The Concentration and Area (μV) columns will be blank. The name of the
calibration will be replaced with the currently selected run.
9 Type the Concentration of the compound as listed on the calibration gas
standard certificate of analysis. An area count (in μV) will populate in the Area
column.