6 Operating in CI Mode
To Operate the Reagent Gas Flow Control Module
5977B Series MSD Operating Manual 153
The Open and Closed states are shown in the monitors as Open and Closed
respectively.
Figure 50. 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/MSD
interface
GC column
CI
source
Table 14 Flow control module state diagram
Result
Gas A flow
Gas B flow
Purge
with Gas A
Purge
with Gas B
Pump out
flow module
Standby, vented, or
EI mode
Gas A Open Closed Open Closed Closed Closed
Gas B Closed Open Closed Open Closed Closed
MFC On
setpoint On setpoint On 100% On 100% On 100% Off 0%
Shutoff valve Open Open Open Open Open Closed
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