View all text of Subjgrp 31 [§ 1065.360 - § 1065.369]
§ 1065.362 - Non-stoichiometric raw exhaust FID O2 interference verification.
(a) Scope and frequency. If you use FID analyzers for raw exhaust measurements from engines that operate in a non-stoichiometric mode of combustion (e.g., compression-ignition, lean-burn), verify the amount of FID O
(b) Measurement principles. Changes in O
(c) System requirements. Any FID analyzer used during testing must meet the FID O
(d) Procedure. Determine FID O
(1) Select three span reference gases that contain a C
(2) Confirm that the FID analyzer meets all the specifications of § 1065.360.
(3) Start and operate the FID analyzer as you would before an emission test. Regardless of the FID burner's air source during testing, use zero air as the FID burner's air source for this verification.
(4) Zero the FID analyzer using the zero gas used during emission testing.
(5) Span the FID analyzer using a span gas that you use during emission testing.
(6) Check the zero response of the FID analyzer using the zero gas used during emission testing. If the mean zero response of 30 seconds of sampled data is within ±0.5% of the span reference value used in paragraph (d)(5) of this section, then proceed to the next step; otherwise restart the procedure at paragraph (d)(4) of this section.
(7) Check the analyzer response using the span gas that has the minimum concentration of O
(8) Check the zero response of the FID analyzer using the zero gas used during emission testing. If the mean zero response of 30 seconds of stabilized sample data is within ±0.5% of the span reference value used in paragraph (d)(5) of this section, then proceed to the next step; otherwise restart the procedure at paragraph (d)(4) of this section.
(9) Check the analyzer response using the span gas that has the average concentration of O
(10) Check the zero response of the FID analyzer using the zero gas used during emission testing. If the mean zero response of 30 seconds of stabilized sample data is within ±0.5% of the span reference value used in paragraph (d)(5) of this section, proceed to the next step; otherwise restart the procedure at paragraph (d)(4) of this section.
(11) Check the analyzer response using the span gas that has the maximum concentration of O
(12) Check the zero response of the FID analyzer using the zero gas used during emission testing. If the mean zero response of 30 seconds of stabilized sample data is within ±0.5% of the span reference value used in paragraph (d)(5) of this section, then proceed to the next step; otherwise restart the procedure at paragraph (d)(4) of this section.
(13) Calculate the percent difference between x
(14) If the O
(i) Repeat the verification to determine if a mistake was made during the procedure.
(ii) Select zero and span gases for emission testing that contain higher or lower O
(iii) Adjust FID burner air, fuel, and sample flow rates. Note that if you adjust these flow rates on a THC FID to meet the O
(iv) Repair or replace the FID and repeat the O
(v) Demonstrate that the deficiency does not adversely affect your ability to demonstrate compliance with the applicable emission standards.
(15) For analyzers with multiple ranges, you need to perform the procedure in this paragraph (d) only on a single range.