Troubleshooting
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 297
2. Electrical current leakage in the FID intercon-
nect or across the Teflon insulators that iso-
late the FID collector from ground.
3. Poor flame stability due to a partially
plugged or contaminated FID jet assembly.
4. Mechanical noise due to loose or vibrating
FID components (interconnect/spring, collec-
tor, etc.).
5. Electronic noise due to faulty or out-of-speci-
fication components on the FID electrometer
or signal board.
NOTE: If the FID baseline has a periodic cycling
component, it could be due to poor regulation and
filtering of a house air compressor system, a
defective tank regulator or a faulty detector EPC
module.
Procedure
The following procedure will help determine the
root cause(s) for high FID noise or background.
1. Confirm the integrity of the gas supply.
Check gas purities. Leak test the plumbing
modules. The gas supply pressures should be
as documented in the 6850 Site Prep/Instal-
lation Manual:
Carrier/Makeup: 80 to 100 psi
Air:
≥ 80 psi
H
2
: ≥ 60 psi
To Next Page
Loading...
Need help?
General
