Agilent Technologies 8255 Nitrogen, User Manual, Page: 93 / 118

Troubleshooting
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SCD and NCD User Manual 93
Troubleshooting Table
Table 11 Troubleshooting Detector Issues
Problem Possible cause Diagnosis Corrective action
Detector problems
No response No ozone Little or no difference in
output signal between ozone
On and Off.
See “No ozone” .
No ozone High voltage transformer
and/or ozone generator
inoperative.
No difference in output
signal between ozone On
and Off even though flow
through the ozone generator
is normal.
Contact Agilent for service.
Restriction in ozone supply
to the reactor cell.
Contact Agilent for service.
No Response Broken ceramic or quartz
tube.
Replace the ceramic tube.
See “Replace the Inner
Ceramic Tube (SCD)” on
page 73 or “Replace the
Quartz Tube (NCD)” on
page 76.
Low Response Inappropriate hydrogen and
oxidizer flow rates.
Check flow rates. Adjust flow rates.
Leak in the detector. Check for leaks in the
detector and repair any
leaks. See “Leaks” on
page 98.
Contaminated ceramic or
quartz tubes.
If there does not appear to
be a leak, then inspect the
ceramic tube. Contamination
can result from column
bleed, samples which
contain volatile metal
complexes, and large
injections of coke-forming
hydrocarbons.
Replace the ceramic tube.
See “Replace the Inner
Ceramic Tube (SCD)” on
page 73 or “Replace the
Quartz Tube (NCD)” on
page 76.
Wandering Baseline Contamination in one of the
detector gases.
Check the difference in the
output signal between ozone
On and Off.
Check inline supply traps
and replace.
Change detector gases.
Leak in the oxidizer lines. Check for leaks in the
detector and repair any
leaks. See “Leaks” on
page 98.