19 Troubleshooting
19.1 Troubleshooting
313
GC-2010 Plus
2. Fluctuating baseline
* Cell conditioning procedure
Remove the column and seal the detector by
installing a new graphite ferrule (with its wire)
in the column nut.
Set the current value to “0 mA”.
Begin makeup gas flow (at the flow rate used
in analysis).
Set the detector temperature 30 °C higher
than the analysis temperature.
(However, the detector temperature cannot
exceed 400 °C, the maximum operating
temperature.)
The conditioning time varies depending on
the degree of contamination, but is approximately 1 to 12 hours.
The baseline may fluctuate because the temperature of a heated zone or the flow rate is
not stable. Check the monitor display. If this problem occurs, contact your Shimadzu
representative.
3. Baseline noise is high
Excessively high current can damage the filament and cause significant noise. Contact
your Shimadzu representative for ceel replacement.
Possible Cause Solution
Carrier gas or make up gas leaks.
Tighten leaking connections.
Replace tubing or septum.
(Refer to “2.6 Gas supply plumbing” in Instruction
Manual)
Carrier gas or make up gas quality is poor.
Replace gas with higher purity gas.
Provide a molecular sieve filter in the gas flow line.
Current value is too high. Reduce the current.
Injection port (glass insert or silica wool) or column is
dirty.
Clean or replace glass insert.
Condition column.
Cell is dirty.
Condition cell.*
Make several solvent injections.
Temperature in room where system is installed
deviates from the commended range and/or
considerably fluctuating.
Keep the room temperature within the commended
range and reduce fluctuation of the room
temperature by making sure that system is not
directly exposed to air conditioner wind etc.
Possible Cause Solution
Carrier gas or makeup gas is contaminated.
Sufficiently purge air inside flow lines.
Replace tubing.
Use higher purity gas.
Provide a molecular sieve filter in the gas flow line.
Gas leaks.
Check for leaks in injection port and column
connection area. Tighten leaking connectors.
Current value is too high. Reduce the current.
Makeup gas flow rate too low. Increase flow rate.
New graphite ferrule
with a wire
Column nut
Detector
Thermal
insulation
cup
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