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40 C.F.R. § 1065.376

Chiller NO2 penetration.

§ 1065.376 Chiller NO2 penetration.

(a) Scope and frequency. If you use a chiller to dry a sample upstream of a NOX measurement instrument, but you don't use an NO2-to-NO converter upstream of the chiller, you must perform this verification for chiller NO2 penetration. Perform this verification after initial installation and after major maintenance.

(b) Measurement principles. A chiller removes H2O, which can otherwise interfere with a NOX measurement. However, liquid H2O remaining in an improperly designed chiller can remove NO2 from the sample. If a chiller is used without an NO2-to-NO converter upstream, it could remove NO2 from the sample prior NOX measurement.

(c) System requirements. A chiller must allow for measuring at least 95% of the total NO2 at the maximum expected concentration of NO2.

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