Troubleshooting
6
SCD and NCD User Manual
99
page 99. If you suspect a leak inside the detector mainframe,
contact Agilent for service. Do not open the detector
mainframe.
Checking for hydrogen and oxidizer leaks
To check for a leak in the hydrogen or oxidizer flow paths, do
the following:
1
Check all external fittings for leaks. Correct any leaks
(tighten or remake connections as appropriate).
2
If you still suspect a leak, establish the typical flow checkout
conditions (see
on page 110 for SCD or
page 115 for NCD).
3
Maintain these conditions for several minutes. If the detector
cannot maintain these flow rates, contact Agilent for service.
4
If the detector was able to maintain the flow rates, turn off
all gas flows using the GC keyboard or the control software.
5
Monitor the pressure readings on the GC display. (Press
[
Front Det
] or [
Back Det
] or [
MS/Aux Det
].) With the vacuum
pump running, the reaction cell pressure should fall to
approximately 0 (zero). The burner pressure should fall to a
value considerably lower than the typical operating pressure.
This process will take time due to the internal configuration
of the burner assembly. If the burner pressure remains high
or at normal pressures, contact Agilent for service.