Agilent Technologies 8255 Nitrogen, User Manual, Page: 94 / 118

94 SCD and NCD User Manual
6
Troubleshooting
Leak in the hydrogen supply
lines.
Check for leaks in the
detector and repair any
leaks. See “Leaks” on
page 98.
Tailing peaks with
non-equimolar response
Severe contamination of
detector gases.
High background signal
compared against ozone Off.
Check inline supply traps
and replace.
Change detector gases.
Tailing peaks Poor column connection. Verify column position at
inlet and outlet. Look for
discoloration of column at
detector fitting which
indicates column in
combustion zone.
Reinstall column. See
“Attach a Column to the
Detector” on page 70.
Cracked tubes. Confirm pressure and
vacuum ranges. Inspect
columns and ferrules.
Replace the ceramic tube.
See “Replace the Inner
Ceramic Tube (SCD)” on
page 73 or “Replace the
Quartz Tube (NCD)” on
page 76.
Detector thermal shutdown Thermocouple open. Contact Agilent for service.
Burner pressure excessively
high.
Cracked quartz or outer
ceramic tube.
Leaking or disconnected
1/16-inch stainless steel
hydrogen or oxidizer line.
Replace the ceramic tube.
See “Replace the Inner
Ceramic Tube (SCD)” on
page 73 or “Replace the
Quartz Tube (NCD)” on
page 76.
Check connection. Check
line for leaks. Contact
Agilent for service if the line
is cracked.
Leak in burner. Check for leaks in the
detector and repair any
leaks. See “Leaks” on
page 98.
Burner pressure lower than
expected and poor response
Cracked inner ceramic tube. See “Replace the Inner
Ceramic Tube (SCD)” on
page 73.
Table 11 Troubleshooting Detector Issues
Problem Possible cause Diagnosis Corrective action