Appendix A CEMS Inspection Sheet
3. Flow Monitors
What to Check
Ask the source to perform a daily interference check or review the results of the most recent test. App. B ' 2.1.2 requires a daily interference check for flow monitors. The interference check procedure and criteria are not defined by rule in Part 75. It should be described in the QA/QC Plan.
When were the filters or transducers last replaced? How does this compare to the QA/QC Plan?
Ask what the QA/QC procedures are for any temperature and stack pressure monitors used in conjunction with the flow monitor. Have there been any problems? Compare to the QA/QC plan and maintenance records.
Check if there have been any changes to k-factors and polynomial coefficients since the last RATA. Changes to correction factors should be recorded in the maintenance log.
A three load RATA is required following any change to flow monitor k-factors ('75.20(b)). Also see Table 8 - DAHS.
What is the status of the control panel lights, indicators and alarms? Displays will vary by analyzer, so ask the source what the displays are and what they mean.
Check range settings, and compare to the monitoring plan. Has the source done the annual span/range check required by App. A?
Part 75 Field Audit Manual – July 16, 2003 Page A-3