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Manual
MS-00809-0100-0470
5
Preventative maintenance
Emerson recommends calibrating the gas chromatograph (GC) daily and reviewing GC
performance (repeatability, total unnormalized, n-pentane retention times, and ethane
retention times) monthly.
5.1
Save diagnostic data
At least every other month, create and save a diagnostic data file and check carrier and
calibration gas supplies.
Fill out the checklist in Maintenance checklist (see the
Chromatograph
5.2
Set up auto-calibration in software
Procedure
Set up the gas chromatograph (GC) to run auto-calibration daily in order to update
response factors and retention times.
5.3
Display trend data
The data to plot the trend graphs displays in the table to the right of the graph display
area.
The Trend Data table contains the following columns:
Pt #
Value
Time
To view all trend data, click Cur/All. To view trend data for the trend graph selected from
the Trend drop-down list, click Cur/All again.
The second trend data table is useful when zooming in to or out of the graph. When the
Selected Data check box is selected, this table displays the trend data for the visible area of
the graph. As the example shows, the table indicates that the trend data for five samples
are visible after zooming in to the graph.
Rosemount 470XA
Manual).
For the purposes of trend graphs, each sample run is considered a data point.
Therefore, if 2500 sample runs were used to generate the trend graph, then there
are 2500 data points.
NOTICE
The first sample, or point, is counted as 0, not 1. The final point is counted as N - 1,
where N is the total number of points in the graph.
The data point's value.
The gas chromatograph (GC's) time when the sample was run and the value was
calculated.
Preventative maintenance
Rosemount 1500XA Gas
June 2023
101
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