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Model 400E Ozone Analyzer
Instruction Manual
8.5.3. System Audit
A system audit is an on-site inspection and review of the quality assurance
activities used for the total measurement system (sample collection, sample
analysis, data processing, etc.); it is a qualitative appraisal of system quality.
Conduct the system audit at the startup of a new monitoring system and
periodically (as appropriate) as significant changes in system operations occur.
The recommended audit schedule depends on the purpose for which the monitoring
data are being collected. For example, Appendix A, 40 CFR 58
analyzer in State and Local Air Monitoring Networks (SLAMS) be audited at least
once a year. Each agency must audit 25% of the reference or equivalent analyzers
each quarter. If an agency operates less than four reference or equivalent
analyzers, it must randomly select analyzers for re-auditing so that one analyzer
will be audited each calendar quarter and so that each analyzer will be audited at
least once a year.
Appendix B, 40 CFR 58
deterioration) reference or equivalent analyzer be audited at least once a sampling
quarter. Results of these audits are used to estimate the accuracy of ambient air
data.
8.5.4. Assessment of Monitoring Data for Precision and
Accuracy
A periodic check is used to assess the data for precision. A one-point precision
check must be carried out at least once every 2 weeks on each analyzer at an O
concentration between 0.08 and 0.10 ppm. The analyzer must be operated in its
normal sampling mode, and the precision test gas must pass through all filters,
scrubbers, conditioners, and other components used during normal ambient
sampling. Those standards used for calibration or auditing may be used.
Estimates of single instrument accuracy for ambient air quality measurements from
continuous methods are calculated according to the procedure in Appendix 15 of
the Q.A. Handbook (Reference 11).
8.6. Summary of Quality Assurance Checks
Essential to quality assurance are scheduled checks for verifying the operational
status of the monitoring system. The operator should visit the site at least once
each week. Every two weeks a Level 1 zero and span check must be made on the
analyzer. Level 2 zero and span checks should be conducted at a frequency desired
by the user.
P/N 04316 Rev: B
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requires that each PSD (prevention of significant
EPA Protocol Calibration
8
requires that each
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