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Code of Federal Regulations (Last Updated: July 5, 2024) |
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Title 40 - Protection of Environment |
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Chapter I - Environmental Protection Agency |
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SubChapter C - Air Programs |
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Part 90 - Control of Emissions from Nonroad Spark-Ignition Engines at or Below 19 Kilowatts |
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Subpart D - Emission Test Equipment Provisions |
§ 90.328 - Measurement equipment accuracy/calibration frequency table.
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§ 90.328 Measurement equipment accuracy/calibration frequency table.
(a) The accuracy of measurements must be such that the maximum tolerances shown in Table 2 in Appendix A of this subpart are not exceeded.
(b) All equipment and analyzers must be calibrated according to the frequencies shown in Table 2 in Appendix A of this subpart.
(c) Prior to initial use and after major repairs, bench check each analyzer (see § 90.323).
(e) At least monthly, or after any maintenance which could alter calibration, perform the following calibrations and checks.
(1) Leak check the vacuum side of the system (see § 90.324(a)).
(2) Verify that the automatic data collection system (if used) meets the requirements found in Table 2 in Appendix A of this subpart.
(3) Check the fuel flow measurement instrument to insure that the specifications in Table 2 in Appendix A of this subpart are met.
(f) Verify that all NDIR analyzers meet the water rejection ratio and the CO2 rejection ratio as specified in § 90.325.
(g) Verify that the dynamometer test stand and power output instrumentation meet the specifications in Table 2 in Appendix A of this subpart.