86.1322-84—Carbon monoxide analyzer calibration.
The NDIR carbon monoxide analyzer shall receive the following initial and periodic calibration.
(a) Initial and periodic interference check.
Prior to its introduction into service and annually thereafter, the NDIR carbon monoxide analyzer shall be checked for response to water vapor and CO2 :
(1)
Follow good engineering practices for instrument start-up and operation. Adjust the analyzer to optimize performance on the most sensitive range to be used.
(3)
Bubble a mixture of 3 percent CO2 in N2 through water at room temperature and record analyzer response.
(4)
An analyzer response of more than 1 percent of full scale for ranges above 300 ppm full scale or more than 3 ppm on ranges below 300 ppm full scale requires corrective action. (Use of conditioning columns is one form of corrective action which may be taken.)
(b) Initial and periodic calibration.
Prior to its introduction into service and monthly thereafter, the NDIR carbon monoxide analyzer shall be calibrated.
(3)
Calibrate on each used operating range with a minimum of 6, approximately equally spaced, carbon monoxide-in-N2 calibration 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 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 not-linear equation which represents the data within these limits shall be used to determine concentration values.
(c)
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 specified in this section.