A-12 Analyzer drift checks
Equation used
4] =
∆
2 × 100
Nomenclature
Drift
The change in analyzer response to calibration gas over the duration of the test run
relative to the instrument range, %
∆
R
The difference between the analyzer response at the end of the test run and the known
calibration gas value, ppmv or %
Span
The upper limit of the instrument range, ppmv or %
Sample calculation
4] =
(1.94% − 2.03%)
5%
× 100 = − 1.8%
Calculated with CO concentration values.
Summary of Contents for 7700
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