Teledyne 9110T GPT Multipoint Calibration Procedure, Handbook, Vol. II, Part 1, Appendix

Model 9110T NOx Analyzer				EPA Protocol Calibration
F NO =	0.45 ppm × 2750	cm 3	/ min	= 24.5 cm	3	/ min
	50 .5 ppm

4. Calculate the required flow rate through ozone generator (FO):

FO =	50.5 ppm x 24.5 cm3	/min x 180 cm3	- 24.5 cm	3	/ min
	2.75 ppm - min

= 80984cm6 / min2 - 24.5cm3 /min= 260 cm3 /min

5.Verify that the residence time (tR) in the reaction cell is <2 min:

				180cm3
	tR =				= 0.63min
		260cm3 / min+ 24.5cm3 / min
	6. Verify the dynamic parameter specification (PR) of the calibrator reaction cell:
	24cm3 / min			180cm3
PR = 50.5ppm×			×			= 2.75ppm − min
	260cm3 / min+ 24.5cm3 / min			260cm3 / min+ 24.5cm3 / min

7. Calculate the diluent airflow (FD) required at the mixing chamber:

FD = 2750 cm3/min - 260 cm3/min - 24.5 cm3/min = 2465.5 cm3/min

10.6. GPT MULTIPOINT CALIBRATION PROCEDURE

The procedure for calibration of chemiluminescence NOx analyzers by GPT is specified in the Federal Register.1 This section applies the general procedure to the specific case of the 9110T.

Calibration must be performed with a calibrator that meets all conditions specified in the Q.A. Handbook.

Note	The user should be sure that all flow meters are calibrated under the
	conditions of use against a reliable standard.
	All volumetric flow rates should be corrected to 25o C (78oF) and 760 mm
	(29.92 in.) Hg. Calibrations of flow meters are discussed in the QA
	Handbook, Vol. II, Part 1, Appendix 126.

Gas Phase Titration (GPT) requires the use of the NO channel of the analyzer to determine the amount of NO2 generated by titration. Therefore it is necessary to calibrate and determine the linearity of the NO channel before proceeding with the NO2 calibration. It is also necessary to calibrate the NOx channel. This can be done simultaneously with the NO calibration. During the calibration the 9110T should be operating in its normal sampling mode, and the test atmosphere should pass through all filters, scrubbers, conditioners, and other components used during normal ambient sampling and as much of the ambient air inlet system as is practicable. All operational adjustments to the 9110T should be completed prior to the calibration.

Teledyne Analytical Instruments 228