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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 U - Air Pollution Controls |
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Part 1065 - Engine-Testing Procedures |
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Subpart B - Equipment Specifications |
§ 1065.135 - NOX analyzers.
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This section describes the requirements for chemiluminescent detectors (CLD) used to measure NO
X . Good engineering practice may require the use of other detectors.(a) A CLD must meet the following requirements:
(1) Make sure your CLD meets the accuracy and precision specifications in ISO 8178-1 (incorporated by reference in § 1065.1010).
(2) The NO to NO
2 converter must have an efficiency of at least 90 percent.(3) Use an overflow sampling system for continuous CLDs. (In an overflow system excess zero gas or span gas spills out of the probe when you are doing zero or span checks.)
(4) You do not need a heated CLD to test spark-ignition engines.
(b) Using CLDs is generally acceptable even though they measure only NO and NO
2 , since conventional engines do not emit significant amounts of other NOX species.