1. LawStack
  2. Title 40 - Protection of Environment
  3. Chapter I - ENVIRONMENTAL PROTECTION AGENCY
  4. Subchapter C - AIR PROGRAMS
  5. Part 90 - CONTROL OF EMISSIONS FROM NONROAD SPARK-IGNITION ENGINES AT OR BELOW 19 KILOWATTS
  6. Subpart E - Gaseous Exhaust Test Procedures
  7. 40 CFR § 90.425
40 CFR § 90.425
CVS calibration frequency
June 9, 2020
CFR

Calibrate the CVS positive displacement pump or critical flow venturi following initial installation, major maintenance, or as necessary when indicated by the CVS system verification (described in §90.424(e)).

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§ 90.424 Dilute sampling procedures—CVS calibration
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§ 90.426 Dilute emission sampling calculations—gasoline fueled engines

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