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Axis BTA 2100D Manual del operador Pagina 167

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Adjusting the CI Reagent Gas Pressure for Gases Other
Than Methane
When you install a new supply of reagent gas, you must adjust the pressure of
the CI reagent gas in the ion trap. After the reagent gas pressure has been
adjusted properly, we recommend that you check the pressure at least once
every day if you intend to perform CI analyses on a daily basis.
The reagent gas pressure is adjusted (or checked) by using the Adjust CI Gas in
System Control. See System control section.
Checking the CI Reagent Gas Pressure. In these procedures, in which methane
serves as the reagent gas, you observe the methane spectrum and adjust the
methane pressure so that: the ratio of the peak heights at mass 17 (CH
5
+) to
mass 16 (CH
4
+) is about 10:1; the ratio of the peak heights at mass 17 to 29
(C
2
H
5
+) is about 1:1; and mass 41 (C
3
H
5
+) is visible.
If you are using isobutane or ammonia as the reagent gas, you can use the same
procedures to adjust and check the reagent gas pressure, with the following
modifications:
Isobutane With isobutane as the reagent gas, observe the isobutane
spectrum and adjust the reagent gas pressure so that the ratio of the peak
heights at mass 57 [(CH
3
)
3
C
+
] to mass 43 [(CH
3
)
2
CH
+
] is about 1:1.
Ammonia With ammonia as the reagent gas, observe the ammonia
spectrum and adjust the gas pressure so that the ratio of the peak heights at
mass 18 [(NH
3
)H
+
] to mass 17 (NH
3
+
) is about 10:1.
In each case, by following these guidelines, the reagent gas pressure in the ion
trap will be approximately 1 x 10
-5
Torr to 2 x 10
-5
Torr (about 1.3 x 10
-3
to 2.6 x
10
-3
Pa).
Reagent Ion Spectrum for Isobutane
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