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Model 9110T NOx Analyzer EPA Protocol Calibration
Teledyne Analytical Instruments 228
min
5.50
min/275045.0
/
cm
24.5
ppm
cm
ppm
=
F
3
3
NO
4. Calculate the required flow rate through ozone generator (F
O
):
min
cm
24.5-
min-ppm 2.75
cm
180 x /min
cm
24.5 x ppm 50.5
=
F
3
33
O
/
/min
cm
260 = /min
cm
24.5-
min
/
cm
80984 =
33
2
6
5. Verify that the residence time (t
R
) in the reaction cell is <2 min:
min63.0
min/5.24min/260
180
cmcm
cm
= t
33
3
R
6. Verify the dynamic parameter specification (P
R
) of the calibrator reaction cell:
min75.2
min/5.24min/260
180
min/5.24min/260
min/24
5.50
ppm
cmcm
cm
cmcm
cm
ppm= P
33
3
33
3
R
7. Calculate the diluent airflow (F
D
) required at the mixing chamber:
F
D
= 2750 cm
3
/min - 260 cm
3
/min - 24.5 cm
3
/min = 2465.5 cm
3
/min
10.6. GPT MULTIPOINT CALIBRATION PROCEDURE
The procedure for calibration of chemiluminescence NO
x
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 25
o
C (78
o
F) 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 NO
2
generated by titration. Therefore it is necessary to calibrate and determine the linearity of the NO
channel before proceeding with the NO
2
calibration. It is also necessary to calibrate the NO
x
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.