PR-312-17204-R02 Portable Analyzer Method Update – Phase 3

A multi-phase project has developed a simplified portable analyzer emission test method for measuring NOx and CO emissions from natural gas-fired combustion sources. The method leverages the inherent linear performance of electrochemical cell-based technology to provide simplified procedures that will lower cost. This Phase 3 report complements earlier Phase 1 and Phase 2 documents that established the technological basis (i.e., linear performance) of the simplified method, developed a draft method, identified data gaps associated method procedures, and conducted limited lab and field tests to address the data gaps. Those efforts culminate with the Phase 3 report that includes the revised test method, discussion of the key elements of the method, and the rationale for their inclusion. Key outcomes are discussed, including advantages to users and to the quality of the measurement. For example, modification of the NO2 pre-check sequence and calibration gas concentration will have significant impacts on the quality of the NO2 calibration gas as manufactured, and the consistency of the measurement of the species. Plans are discussed for final phase tasks associated with sharing the method with EPA or state agencies and pursuing acceptance. .