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Calibration
Calibration
4-14
42iQHL Instruction Manual
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. Press the Back button to return to the Calibration menu, and choose
Calibrate NO
Span Coefficient.
2
The user sets the span concentration by pressing the Edit NO
Concentration button. The Calculated NO
will show what the span coefficient will be set to if the Calibrate button
is pressed. Pressing the Calibrate button will save the new NO
coefficient and calibrate the instrument.
10. Enter the NO
calibration gas concentration using the pushbuttons,
2
and then press Calibrate to concentration to reflect the sum of the
following: the NO
[NO]
), and any NO
REM
The exact NO
concentration is calculated from:
x
[
=
([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
The analyzer does a one point NO
corrects the NO
reading for converter inefficiency, and then adds the
2
corrected NO
to the NO signal to give a corrected NO
2
If the analyzer calculates a NO
the entered NO
concentration is incorrect, the converter is not being
2
heated to the proper temperature, the instrument needs servicing (leak
or imbalance), or the converter needs replacement or servicing. The
NO
analog output will reflect the NO
2
GPT, any NO
impurity, and the NO
2
range. The decrease must not exceed 90% of
2
.
REM
concentration generated by GPT, ([NO]
2
impurity.
2
-
[NO
)
+
]
]
ORIG
REM
concentration at the output manifold, ppm
2
span coefficient calculation,
2
span coefficient of less than 0.96, either
2
concentration generated by
2
zero offset.
2
Span
2
Span Coefficient button
2
span
2
-
ORIG
[ x
]
F
NO
NO
2
IMP
+
+
F
F
F
NO
O
D
, ppm
3
, ppm
3
signal.
x
Thermo Scientific
to
3
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