R 336.2153 Zero and drift for continuous emission monitoring systems.

Rule 1153. (1) The owner or operator of any continuous emission monitoring system required by this part shall do all of the following: (a) Subject the instruments to the manufacturer's recommended zero and span check at least once daily, unless the manufacturer has recommended adjustments at shorter intervals, in which case such recommendations shall be followed. (b) Adjust the zero and span when the 24-hour zero drift or 24-hour calibration drift limits of the applicable performance specifications in appendix B of 40 C.F.R. Part 60, adopted by reference in R 336.1299, are exceeded. (2) Calibration gases used pursuant to the provisions of subrule (1) of this rule shall meet the requirements of R 336.2151.