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TITLE 40 - PROTECTION OF ENVIRONMENT
CHAPTER I - ENVIRONMENTAL PROTECTION AGENCY
PART 86 - CONTROL OF EMISSIONS FROM NEW AND IN - USE HIGHWAY VEHICLES AND ENGINES
subpart b - EMISSION REGULATIONS FOR 1977 AND LATER MODEL YEAR NEW LIGHT - DUTY VEHICLES AND NEW LIGHT - DUTY TRUCKS AND NEW OTTO - CYCLE COMPLETE HEAVY - DUTY VEHICLES; TEST PROCEDURES
86.116 - 90 - Calibrations, frequency and overview.
(a) Calibrations shall be performed as specified in 86.117 through 86.126.
(b) At least yearly or after any maintenance which could alter background emission levels, evaporative enclosure background emission measurements shall be performed.
(c) At least monthly or after any maintenance which could alter calibration, the following calibrations and checks shall be performed: (1) Calibrate the hydrocarbon analyzers (both evaporative and exhaust instruments), carbon dioxide analyzer, carbon monoxide analyzer, oxides of nitrogen analyzer, methanol analyzer, and formaldehyde analyzer (certain analyzers may require more frequent calibration depending on particular equipment and uses).
(2) Calibrate the dynamometer. If the dynamometer receives a weekly performance check (and remains within calibration) the monthly calibration need not be performed.
(3) Perform a hydrocarbon and methanol (if methanol fuel is used) retention check and calibration on the evaporative emission enclosure.
(4) Calibrate the gas meters or flow instrumentation used for providing total flow measurement for particulate sampling.
(d) At least weekly or after any maintenance which could alter calibration, the following calibrations and checks shall be performed: (1) Check the oxides of nitrogen converter efficiency, and (2) Perform a CVS system verification.
(3) Run a performance check on the dynamometer. This check may be omitted if the dynamometer has been calibrated within the preceeding month.
(e) The CVS positive displacement pump or Critical Flow Venturi shall be calibrated following initial installation, major maintenance, or as necessary when indicated by the CVS system verification (described in 86.119).
(f) Sample conditioning columns, if used in the CO analyzer train, should be checked at a frequency consistent with observed column life or when the indicator of the column packing begins to show deterioration.
[54 FR 14516, Apr. 11, 1989]
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