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