10
Check the following points about the carrier gas connections.
Carrier gas pressure
The operational gas supply pressure to the GC is in the range 300 to 980kPa. But some
supply pressures have a limiting effect on the pressures that can be set at the GC. The
normal supply pressure is 700 to 800kPa.
Carrier gas purity
Leaks from the pipes and organic matter can hinder high-accuracy measurements
(particularly for integrated piping).
Residual air in pipes and air in the analyzer also have an adverse influence on analysis.
Be sure to conduct the following checks when connecting the pipes:
c Purge the pipes. (Place a piece of paper over the end of pipes and check that no color is
visible.)
d Sniff the gas to check it has no bad smell.
e Purge the GC connector for several minutes.
f Set the GC total flowrate to maximum and leave for 10 to 20 minutes.
Mounting the column
Mount the column, as described in section 3.2 Preparation for Analysis
of the Operation
Guide.
Caution
Minute traces of interfering components appear easily in the analysis results due to the high
sensitivity of the instrument.
Never touch the septum or glass insert at the inlet with bare hands.
When mounting the column, wipe all parts with acetone before inserting them.
Installation
All required software is preinstalled in the PC set but, unless the latest software versions are
installed, the software must be upgraded to the latest version.
Refer to applicable Technical Information for details about how to obtain the latest software
and the method of installation.
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