Division 7.3.2.4 Drift verification

After quantifying exhaust gas, drift shall be verified as follows:

1. (a)

   For batch and continuous gas analyzers, the mean analyzer value shall be recorded after stabilizing a zero gas to the analyzer. Stabilization may include time to purge the analyzer of any sample gas, plus any additional time to account for analyzer response;

2. (b)

   The mean analyzer value shall be recorded after stabilizing the span gas to the analyzer. Stabilization may include time to purge the analyzer of any sample gas, plus any additional time to account for analyzer response;

3. (c)

   These data shall be used to validate and correct for drift as described in point 8.2.2.