Troubleshooting The Tcd - Thermo Scientific TRACE GC Ultra Maintenance And Troubleshooting Manual

Chapter 16
Maintaining a Thermal Conductivity Detector

Troubleshooting the TCD

Symptom
Baseline fluctuations
Baseline drift
342
Table 16-2. TCD troubleshooting table
Diagnosis
Unstable regulation of the
flow rate of the gases
Leaks on the gas lines
Inlet pressure of gases set too
low
set too high
Trans temp
Faulty temperature regulation
Unstable regulation of the
flow rate of the gases
Leaks on the gas lines
Column conditioning not
correctly performed
Septum bleeding
Remedy
Check the controllers of the carrier,
reference and make-up gases work
well.
Check the connections of the carrier,
reference and make-up gas are tight.
Set the pressure of the carrier,
reference and make-up gas to a proper
value.
TM
Refer to the TRACE
Operating Manual for instructions.
Set to a proper value
Trans temp
(about 10 to 20°C below the
value).
temp
Contact your customer support
organization.
Refer to Appendix B,
Communication, for contact
information.
Check the controllers of the carrier,
reference and make-up gases work
well.
Check the connections of the carrier,
reference and make-up gas are tight.
Recondition the column according to
the manufacturer's instructions.
Check the operating temperature of
the septum is adequate.
Replace the septum if necessary.
Maintenance and Troubleshooting Manual
TCD Troubleshooting
GC Ultra
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