Paramagnetic and magnetopneumatic O 2 detection analyzers.

(a) Application. You may use a paramagnetic detection (PMD) or magnetopneumatic detection (MPD) analyzer to measure O 2 concentration in raw or diluted exhaust for batch or continuous sampling. You may use good engineering judgment to develop calculations that use O 2 measurements with a chemical balance of fuel, DEF, intake air, and exhaust to calculate exhaust flow rate. (b) Component requirements. We recommend that you use a PMD or MPD analyzer that meets the specifications in § 1065.205. Note that it must meet the linearity verification in § 1065.307. [73 FR 37300, June 30, 2008, as amended at 76 FR 57443, Sept. 15, 2011;79 FR 23762, Apr. 28, 2014; 86 FR 34536, June 29, 2021; 89 FR 29797, Apr. 22, 2024]