86.1216-90—Calibrations; frequency and overview.
(b)
At least yearly or after any maintenance which could alter background emission levels, 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 analyzer (see § 86.1221 ). 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 (see § 86.1218 ).
(3)
Perform a hydrocarbon retention check and calibration on the evaporative emission enclosure (see § 86.1217 ).
(d)
At least twice annually or after any maintenance perform a methanol retention check and calibration on the evaporative emission enclosure (see § 86.1217 ).
(e)
Calibrate the methanol analyzer as often as required by the manufacturer or as necessary according to good practice.