Getting Started
Agilent Graphite Tube Atomizer GTA 120 User’s Guide 27
Gas Supplies
Two gas inlets are provided, ‘Normal' and ‘Alternate'. The supply of
gas to the GTA is set up and regulated during installation by an
Agilent field service engineer.
NOTE
Depending on your requirements at the time, the alternate gas supply may not
have been connected at installation. If you need to add this supply later, connect
a gas supply to the alternate gas inlet, regulated as per the specifications
provided in Section 2.
The gas pressure is set at installation in accordance with the
specifications included in Section 2.
You should be aware of the following points:
Inert gas must be supplied through the ‘Normal’ inlet at the back
of the control unit; otherwise the system will not operate. If the
gas supply is turned off or fails, a monitoring system will cause
the system to stop. Both normal and alternate supplies are
monitored. A supply failure in a gas needed by your method will
cause the system to stop, an error message to be displayed on the
screen and the beeper to sound.
As outlined in Section 2, the gas supplied through the ‘Normal’
inlet must be an inert gas (either nitrogen or argon) but you can
use either an inert gas or other gases as the alternate gas.
An alternate gas may be used for many reasons. For example, it
can reduce background interferences. (This is seen in blood
analyses, where air is the preferred gas for the ashing step as it
removes more of the blood matrix components.) Refer to the
SpectrAA Help or ‘Analytical Methods for Graphite Tube
Atomizers' for more information on the use of alternate gases.
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