Teledyne 9110T instruction manual GPT NO2 Check, See the Troubleshooting if there are problems

Model 9110T NOx Analyzer EPA Protocol Calibration

Note	See the Troubleshooting Section 12 if there are problems.
	Also see the Calibration Quality Check procedure Section 9.6.

6.After the zero and the 80% upper range limit points have been set, generate five approximately evenly spaced calibration points between zero and 80% upper range limit without further adjustment to the instrument.

7.Allow the instrument to sample these intermediate concentrations for about 10 minutes each and record the instrument NO and NOX responses.

8.Plot the analyzer NO and NOX responses versus the corresponding calculated concentrations to obtain the calibration relationships.

∙Determine the straight line of best fit (y = mx + b) determined by the method of least squares.

9.After the best-fit line has been drawn for the NO and the NOX calibrations, determine whether the analyzer response is linear.

∙To be considered linear, no calibration point should differ from the best-fit line by more than 2% of full scale.

10.7.GPT NO2 CHECK

The 9110T computes the NO2 concentration by subtracting the NO from the NOX concentration. Unlike analog instruments, this difference is calculated by the 9110T's internal computer software. It is extremely unlikely that the NO2 concentration will be in error. Therefore this procedure is a confirmation that the NO2 subtraction algorithm in the computer is operating correctly.

IMPORTANT	IMPACT ON READINGS OR DATA
	Do not make any adjustments to the instrument during this procedure.
	1. Generate an NO concentration near 90% of the upper range limit.
	∙ Dilution air and O3 generator air flows should be the same as used in the
	calculation of specified conditions of the dynamic parameter according to
	Section 10.5.
	2. Sample this NO concentration until the NO and NOx responses stabilize. Record
	the NO and NOx concentrations.
	3. Turn ON and adjust the O3 generator in the calibrator to produce sufficient O3 to
	decrease the NO concentration to about 10% of full scale.
	∙ This will be equivalent to 80% of the URL of the NO2 channel. After the analyzer
	responses stabilize, record the resultant NO, NOX, and NO2 concentrations.
Note	If the NOX reading should drop to less than 96% of its starting value
	during this step, it indicates the NO2 converter is in need of
	troubleshooting or replacement. See Section 12.7.10 for further details.

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