Prior to its introduction into service and monthly thereafter, the NDIR carbon dioxide analyzer shall be calibrated as follows:
(a) Follow good engineering practices for instrument start-up and operation. Adjust the analyzer to optimize performance.
(b) Zero the carbon dioxide analyzer with either zero-grade air or zero-grade nitrogen.
(c) Calibrate on each used operating range with a minimum of 6, approximately equally spaced, carbon dioxide-in-N2 calibration or span gases (e.g., 15, 30, 45, 60, 75, and 90 percent of that range). For each range calibrated, if the deviation from a least-squares best-fit straight line is within ±2 percent or less of the value at each non-zero data point and within ±0.3 percent of full scale on the zero data point, then concentration values may be calculated by using the linear calibration equation for that range. If the deviation exceeds these limits, then the best-fit non-linear equation which represents the data within these limits shall be used to determine concentration values.
(d) The initial and periodic interference, system check, and calibration test procedures specified in 40 CFR part 86, subpart D, may be used in lieu of the procedures in this section.
[48 FR 52210, Nov. 16, 1983, as amended at 62 FR 47129, Sept. 5, 1997]
Title 40 published on 2014-07-01
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