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6
Operating in CI Mode
The CI Flow Control Module
7000/7010 Series TQ GC/MS Operating Manual
137
The CI Flow Control Module
The CI reagent gas flow control module regulates the flow of reagent gas
through the GC/MS interface and into the CI source. (See
on page 138.) The CI option consists of the MFC, gas select valves, CI calibration
valve, shutoff valve, control electronics, plumbing, tip seal assembly, and CI
source.
The back panel provides Swagelok inlet fittings for methane (
CH4
) and one
other
gas. The software refers to them as
Gas A
and
Gas B,
respectively. If you are not
using a second gas, cap the
other
fitting to prevent accidental admission of air to
the analyzer. Supply reagent gases at 25 to 30 psi (170 to 205 kPa).
The shutoff valve prevents contamination of the flow control module by
atmosphere while the MS is vented or by PFTBA during EI operation. The MS
monitors will reflect
On
as
1
and
Off
as
0
. (See
Figure 43.
Reagent gas flow control module schematic
Gas A
(methane)
supply
Gas B
(other)
supply
Gas A
select valve
Gas B
select valve
MFC
Calibration
valve
Restrictor
Calibration
vial
Shutoff
valve
GC/MS
interface
GC column
CI
source