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This document outlines the quality assurance and control requirements for Continuous Opacity Monitoring Systems (COMS). Established in 1992 as an addition to 40 CFR Part 51, Appendix M, it specifies procedures to ensure minimum quality control and assurance standards for COMS performance. The guidelines include daily checks, zero and span requirements, quarterly performance assessments, optical alignment, and calibration error checks. Recent revisions aim to enhance the monitoring acceptance criteria and address out-of-control periods through regular checks and corrective action procedures. This comprehensive framework covers maintenance and repair protocols, ensuring the optimal functioning of opacity monitors. Stay informed about the current schedule and key updates in this pivotal compliance document.
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Method 203 Quality Assurance/Quality Control Requirements for Continuous Opacity Monitoring Systems (COMS)
Background/History • Proposed in October, 1992 • Addition to 40 CFR Part 51, Appendix M • Specified quality assurance requirements/procedures • After initial demonstration of compliance with PS-1
Background/History, cont’d • Minimum quality control (QC) and quality assurance (QA) • Assess and assure the quality of COMS performance
Requirements • Daily checks • Zero and span (upscale)
Requirements, cont’d • Quarterly performance checks • Optical alignment • Optical surface dust accumulation • Zero and upscale response • Zero compensation • Stack exit correlation error • Calibration error
Requirements, cont’d • Annual checks • Zero alignment
Monitor Acceptance Criteria • Out-of-control periods • Daily checks • Quarterly performance audits • Annual checks • Data capture • 95 percent valid data capture
Recent Activities • Reopened comment period • March 2001 • Established Stakeholders Workgroup • Monthly conference calls • Re-write and re-propose Method 203
Revised Method 203 • Requirements • Eliminate optical surface dust accumulation, stack exit correlation error, zero and upscale response • Optical alignment • Checked when stack temperature is +/- 20 percent of typical operating temperature • Zero alignment • Required to be done off stack every 3 years
Revised Method 203, cont’d • Monitor acceptance criteria • Out-of-control periods (Calibration Drift) • The beginning of the period corresponds to the completion of the daily calibration drift check • Out-of-control periods (Quarterly Performance Audits and Annual Checks) • No change
Revised Method 203, cont’d • Data Capture • 95 percent of the source’s operating hours per quarter • Allow the use of substitute monitors • Previously certified to meet PS-1 • Perform calibration error check • Check calibration drift on a daily basis
Revised Method 203, cont’d • Corrective action procedures • Describes corrective action required to return an opacity monitor to normal operation • Specifies four classes of maintenance and repair procedures • Routine/preventative maintenance • Measurement non-critical repairs • Measurement critical repairs • Rebuilt or refurbished analyzers
Current Schedule • Re-proposal package published in the Federal Register – December 2002 • Promulgation package published in the Federal Register – December 2003
