Agilent Technologies 7250 Troubleshooting And Maintenance Manual page 54

3 CI Troubleshooting
If you use argon or other introduced gas to find air leaks, this does not work well
for the reagent gas flow system. It takes as long as 15 minutes for the peak to
reach the ion source if the leak is at the inlet to the flow module.
CI cal
valve
Shutoff
valve
NC
PFDTD
To ion source
Figure 6. Schematic of CI flow control
Table 4 Flow module valve state diagram
 
 
Result Gas A flow
Gas A Open
Gas B Closed
MFCV On (at setpoint)
Shutoff valve Open
54
 

Purge with
Gas B flow Gas A
Closed Open
Open Closed
On (at setpoint) On (at 100%)
Open Open
7250 Accurate-Mass Q-TOF Troubleshooting and Maintenance Manual
Flow control module
FC
FT
MFCV

Purge with
Gas B
Closed
Open
On (at 100%)
Open
Gas A
Gas B

Standby,
Pump out 
vented, or
flow module EI mode
Closed Closed
Closed Closed
On (at 100%) Off (at 0%)
Open Closed