Agilent Technologies 5975C TAD VL MSD Troubleshooting And Maintenance Manual page 63

Figure 3
Table 6 Flow module valve state diagram
Result Gas A flow
Gas A Open
Gas B Closed
MFC On (at
setpoint)
Shutoff valve Open
5975 Series MSD Troubleshooting and Maintenance Manual
Gas A
(methane)
supply
Gas A
select valve
Gas B
(other gas)
supply
Gas B
select valve
Schematic of CI flow control module
Gas B flow
Closed
Open
On (at
setpoint)
Open
Mass
flow
controller
Calibration
valve
Restrictor
Calibration
vial
Purge Purge
with Gas A with Gas B
Open Closed
Closed Open
On (at 100%) On (at 100%)
Open Open
CI Troubleshooting
CI ion
source
Shutoff valve
GC/MSD
interface
GC column
Pump out Standby,
flow module vented, or
EI mode
Closed Closed
Closed Closed
On (at 100%) Off (at 0%)
Open Closed
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