Agilent Technologies 6850 Series II User Information page 188

Air in
Hydrogen in
Makeup in
Figure 32. FID gas flow paths
Table 36. Maximum Gas Flows
Gas
Hydrogen
Air
Nitrogen makeup
Helium makeup
Argon makeup
The flame goes out or will not light
•
•
Released: March 2004
y
External
pressure
y
regulators
Filter
frits
y
Maximum flow rate, mL/min
100
800
100
100
100
The column flow rate may be too high. Decrease the column flow rate or
pressure. Switch to a more restrictive column, for example a longer
column or one with a smaller id. If you must use a column with a large id,
turn off the column flow long enough to allow the FID to light.
Check that the gases are plumbed correctly, the external lines have been
well purged and the system is leak-free.
6850 Series II GC User Information
Maintaining a flame ionization detector (FID)
Proportional Pressure
valves sensors
Control loops
Routine Maintenance: Detectors
Restrictors
page 188 of 256