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Calibration
Calibration
Thermo Scientific
42iQTL Instruction Manual
4-11
Use the following procedure to set the prereactor background. Both the
NO and NO
x
background screens operate the same way, and the following
procedure also applies to the NO and NO
x
background screen.
Note
The prereactor background should be zeroed first followed by the
NO, then the NO
x
backgrounds.
▲
For detailed information about the menu parameters and the icons used in
these procedures, see the “
Operation
” chapter.
1.
Determine the GPT flow conditions required to meet the dynamic
parameter specifications as indicated in “
Dynamic Parameter
Specifications for Gas Titrator
” earlier in this chapter.
2.
Adjust the GPT diluent air and O
3
generator air flows to obtain the
flows determined in “
Dynamic Parameter Specifications for Gas
Titrator
” earlier in this chapter. The total GPT airflow must exceed the
total demand of the analyzer. The 42iQTL requires approximately 700
cc/min of sample flow, and a total GPT airflow of at least 1.5 liters/min
is recommended.
a.
Allow the analyzer to sample zero air until the NO, NO
2
, and NO
x
responses stabilize.
b.
After the responses have stabilized, from the Home Screen, choose
Calibration>Calibrate Backgrounds>Calibrate Prereactor
Background
.
The Target Prereactor Concentration button will read 0.00. The
Calculated Prereactor Background button will display the
background needed to make the current Prereactor concentration
go to 0.00.
c.
Press
Calibrate
to set the prereactor reading to zero and to save the
new background.
d.
Press the Back button to return to the Calibration Backgrounds
screen and repeat this procedure to set the
Calibrate NO
Background
to zero followed by the NO
x
background.
e.
Record the stable zero air responses as Z
NO
, Z
NOX
, and Z
NO2
.
3.
Adjust the NO flow from the standard NO cylinder to generate a NO
concentration of about 80% of the upper range limit (URL) of the NO
range. The exact NO concentration is calculated from:
Содержание 42iQTL
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Страница 229: ...Servicing Power Supply Replacement Thermo Scientific 42iQTL Instruction Manual 7 25 Figure 7 25 Replacing Power Supply ...
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