Appendix A Sample Linearity Test Standard Operating Procedure
28.Repeat Steps 24 - 26 for the high range gas.
29.Repeat Steps 24 - 28 for Run 2
30.Repeat Steps 24 - 28 for Run 3
31.Repeat Steps 24-30 for each gas monitor to be evaluated.
32.Using the Linearity Test Audit spreadsheet calculate the average percentage error at each gas concentration level for each gas tested.
32.a.The error in linearity for each calibration gas concentration (low-, mid-, and high-levels) shall not exceed or deviate from the reference value by more than 5.0 percent as calculated by the equation:
LE=(|R-A|/R)*100% , or
32.b.The absolute value of the difference between the average of the monitor response values and the average of the reference values, |R-A| shall be less than or equal to 0.5 percent CO2 or O2, whichever is less restrictive.
33.The linearity requirements are located in 40 CFR 75, Appendix A.
34.Have the plant personnel detach the line from the CEMS injection point. Disconnect the gas delivery manifold from the gas delivery line and pack the delivery line.
35.Detach the regulators as follows:
35.aClose the cylinder valve.
35.b.Vent the gas in the regulator by turning the adjusting knob clockwise so that no pressure is trapped inside the regulator.
35.cClose the regulator. After relieving all the gas pressure, turn the adjusting knob counterclockwise as far as it will go.
35.dDisconnect each regulator from the gas delivery manifold.
35.e.Disconnect the regulator.
35.f.Protect the regulator by packing it so that the fittings will not be exposed to dirt, contamination, or mechanical damage.
35.g.Replace the cylinder valve cap.
Part 75 Field Audit Manual - July 16, 2003 Page A-35