where;
% difference between average and initial flow rate.
This may be a plus or minus value and may not exceed 5% (EPA).
The second EPA indicator of flow rate stability is the percent of difference between each hourly
flow rate reading and the initial flow rate.
F(t) - F(1)
(t) = ------------
F(1)
where;
F(t) = hourly flow rate readings F(2), F(3), F(4) etc.
(t) = % difference between individual hourly readings and initial flow rate.
This may be a plus or minus value and no value may exceed 10%.
In reality all displayed values should be expected to be typically less than 1% and should not
exceed 2%. Values more than 2% should be investigated. A blocked or restricted inlet, hose,
etc. at precisely the time the PQ100 takes a reading internally should be suspected.
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