Agilent Technologies 8890 - Page 73

Maintenance and Troubleshooting 5
Purge mode
Agilent Gas Sample Selector for 8860 and 8890 User Manual 73
Figure 22 Purge mode (maintenance) for cylinder version.
1
5
3
7
Sample Loop
Carrier Gas
To C ol u m n
On/Off Valve
GC Valve 1
Needle Valve 2
MPV
Multi-Position Valve
Purge Valve
•GCValve1 –OFF
•
Sample Valve – OFF
• Purge Valve – ON
Purge N
2
Needle Valve 1
Selector
Selector GC
Sample Gas
Purge Gas
Carrier Gas
n/
O
f
f
V
a
V
V
l
1
2
3
4
5
6
OUT
Sample In