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ABB LGR-ICOS™ GLA232 Series Methane/Ethane Analyzer User Manual
File Transfer Menu
Use the File Transfer menu to access data collected by the analyzer.
Each time the analyzer is re-started, the most recent file name is displayed in the form:
meaRMY_000000000000_2022-12-29_f0001.txt, where the:
o First 3 characters represent the analyzer model (mea)
o Next group of (12) characters represent the analyzer serial number
o Next group of (10) characters represent the date (yyyy-mm-dd)
o Last four numbers are a file serial number.
The file serial number counts upward to provide up to 10,000 unique file names daily.
If the analyzer is left in continuous operation, a new data file is automatically created
every 24 hours to keep data file sizes manageable.
Standard Data File
Data files are written in text (ASCII) format and contain labeled columns displaying:
Time stamp of each aggregated data set (set to Coordinated Universal Time (UTC) by
default)
Time stamp of each raw analyzer measurement
[CH
] (ppm)
4
[H
O] (ppm)
2
[C
H
] (ppm)
2
6
Dry [CH
] (ppm)
4
Dry [C
H
] (ppm)
2
6
Cell pressure (Torr)
Cell temperature (Celsius)
Ambient temperature (Celsius)
Ringdown times (microseconds)
Figure 14 shows a typical data file.
For each measurement, there is an adjacent column reporting the standard deviation of the
measurement (with sd suffix).
The standard deviation is zero when the analyzer is running at 1 Hz or faster, because no
averaging of data has occurred.
At speeds slower than 1 Hz, the standard error of the average is reported.
ABB PROPRIETARY INFORMATION
Figure 14: Beginning of a Typical Data File
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