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Calibration
Calibration
4-14
Model 42i Trace Level Instruction Manual
a zero point, NO and NO
URL, and an intermediate concentration.
5. Sample this NO concentration until the NO and NO
stabilized, then measure and record the NO concentration as [NO]
6. Adjust the GPT system to generate a NO concentration near 90% of
the URL of the instrument range selected.
7. Adjust the O
generator in the GPT system to generate sufficient O
3
produce a decrease in the NO concentration equivalent to about 80%
of the URL of the NO
the NO concentration determined in Steps 5 and 6 above.
8. When the analyzer responses stabilize, record the resultant NO
concentrations as [NO]
9. From the Main Menu choose Calibration > Cal NO2 Coefficient.
The NO
line of the Calibrate NO
2
concentration. The SPAN CONC line of the display is where you enter
the NO
calibration gas concentration.
2
10. Set the NO
calibration gas concentration to reflect the sum of the
2
following: the NO
[NO]
), and any NO
REM
Use
to move the cursor left and right and use
to increment and decrement the numeric character at the cursor.
[
]
=
([NO
NO
2
OUT
Where:
[NO
]
= diluted NO
2
OUT
[NO]
= original NO concentration, prior to addition of O
ORIG
[NO]
= NO concentration remaining after addition of O
REM
11. Press
to calculate and save the new NO
entered span concentration.
concentrations of approximately 80% of the
x
range. The decrease must not exceed 90% of
2
.
REM
screen displays the current NO
2
concentration generated by GPT, ([NO]
2
impurity.
2
]
-
[NO
]
)
+
ORIG
REM
concentration at the output manifold, ppm
2
responses have
x
ORIG
[ x
]
F
NO
NO
2
IMP
+
+
F
F
F
NO
O
D
, ppm
3
, ppm
3
coefficient based on the
2
Thermo Fisher Scientific
.
ORIG
to
3
2
-
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Troubleshooting
