Teledyne 9110T Other Quality Assurance Procedures, Summary of Quality Assurance Checks

Model 9110T NOx Analyzer EPA Protocol Calibration

4.While maintaining all other conditions, adjust the ozone generator to obtain several other concentrations of NO2 evenly spaced between the 80% URL point and the zero point. Record the NO, NOX, and NO2 concentrations for each additional point.

5.Calculate the resulting NO2 concentrations as follows:

Equation 10-10

[ NO2 ]OUT = [NO ]ORIG - [NO ]REM + FNO * [ NO2 ]IMP FT

Where [NO]ORIG is the NO concentration before the GPT ozone is turned on, and [NO]REM is the NO remaining after GPT.

Plot the NO2 concentration output by the instrument on the y-axis against the generated NO2 [NO2]OUT on the x-axis. The plot should be a straight line within the ± 2% linearity criteria given for the NOx and NO channels. If the plot is not linear, the most likely cause is that the converter needs replacing. See Section 9.1.4 on NO2 converter efficiency and Section 11.3.8 for changing the converter if needed.

10.8. OTHER QUALITY ASSURANCE PROCEDURES

Precision is determined by a one-point check at least once every two weeks. Accuracy is determined by a three-point audit once each quarter.

Essential to quality assurance are scheduled checks for verifying the operational status of the monitoring system. The operator should visit the site at least once each week. Every two weeks a Level 1 zero and span check must be made on the analyzer. Level 2 zero and span checks should be conducted at a frequency desired by the user. Definitions of these terms are given in Table 10-2.

10.8.1. SUMMARY OF QUALITY ASSURANCE CHECKS

The following items should be checked on a regularly scheduled basis to assure high quality data from the 9110T. See Table 10-3 for a summary of activities; also the QA Handbook should be checked for specific procedures.

Teledyne Analytical Instruments 232