11 Micro GC Natural Gas Analyzer
Checkout Information
146 Agilent 990 Micro GC User Manual
Checkout Information
Introduction
The Agilent 990 Micro GC - Natural Gas Analyzers are factory tuned on carrier gas helium
including appropriate settings for back flush times for the following channels:
• HayeSep A
• 4 meter CP-Sil 5 CB
• CP-Molsieve 5A
• PoraPLOT U
The final checkout of the Agilent 990 Micro GC - Natural Gas Analyzer is performed with a NGA
Gas Calibration standard and a Universal Gas Calibration standard.
• The NGA Gas Calibration standard contains nitrogen, methane, ethane, carbon dioxide,
propane, iso-butane, n-butane, iso-pentane, n-pentane, and n-hexane. This natural gas
standard does not contain all components specified for each type of Natural Gas Analyzer.
Therefore, a second checkout sample, the Universal Gas Calibration standard is analyzed on
the Natural Gas Analyzer.
• The Universal Gas Calibration standard contains helium, neon, hydrogen, oxygen, nitrogen,
methane, ethane, ethylene, carbon dioxide, carbon monoxide, acetylene, propane, methyl
acetylene, n-butane, n-hexane, and n-heptane. Not all components in the Universal Gas
Calibration standard are specified for the Natural Gas Analyzer.
More detailed information about the NGA Gas Calibration standard and the Universal Gas
Calibration standard can be found in Certificate of the NGA Gas Calibration Standard on
page 160 and Certificate of the Universal Gas Calibration Standard on page 161.
The components specified for each channel are described in Agilent 990 Micro GC - Natural Gas
Analyzer A and the Extended Version on page 144 and Agilent 990 Micro GC - Natural Gas
Analyzer B and the Extended Version on page 145.
The NGA Gas Calibration standard and the Universal Gas Calibration standard are shipped with
the analyzer and used by the Agilent Customer Engineer at installation. The factory tuned method,
final chromatogram (Test Report), and the Natural Gas Analyzer User Manual are supplied on the
Analyzer CD.
To perform reference checks on the analyzer, use the NGA Gas Calibration standard or the
Universal Gas Calibration standard. If OpenLAB CDS EZChrom is used, load the method from the
analyzer CD or create a method using the settings from the method pdf-file available on the
analyzer CD. For a quick start, see the method settings for Natural Gas Analyzers listed in Typical
Method Settings for Natural Gas Analyzers on page 162. Connect and inject the NGA Gas
Calibration standard.
To analyze helium on the CP-Molsieve 5A channel, use the Universal Gas Calibration standard for
the checkout. Ensure that the carrier gas argon is supplied and configured before starting the
analysis. For more information on how to configure the carrier gas for the analyzer see Carrier
Gas Type Configuration on page 164. Method settings for this analysis can be found in Method
for CP-Molsieve 5A Channel with Carrier Gas Argon on page 168.
The NGA Gas Calibration standard and the Universal Gas Calibration standard do not contain
hydrogen sulfide. A reference chromatogram of hydrogen sulfide is included in this manual.
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