Campbell Scientific TGA100 Trace Gas Analyzer Manual - Manual (Page 42)

Table 7. Site Means File Contents
Day Day of year, with January 1 written as 1
Time Time of day, in 24 hour format. For example 6:15:01 AM is written as 06:15:01, and 6:15:01
PM is written as 18:15:01.
Site Site number, from 1 to 18.
M/S ID Master/slave identifier. This column includes a number, 0 through 4, to identify data from the
master TGA100, which always controls the sampling system, and slave TGA100s, which may
share a sampling system as described in section 5.3. If the analyzer is in dual ramp mode, this
field will also include "A" or "B" to differentiate between ramp A data and ramp B data. If the
TGA100 is not in dual ramp mode and there are no slave TGA100s attached this column will
always be 0. The number of slaves recorded in the file is set by the "Number of slaves attached
to this TGA" parameter, as described in section 5.3.
# Scans: Number of scans included in the calculations, where a scan is a measurement of each active site.
Mean Conc.
(ppm) The mean trace gas concentration, in ppm, calculated from the measurements that are valid for
the site.
Conc. Slope
(ppm/scan) The time rate of change of trace gas concentration, in ppm/scan, for the site.
Mean Pressure
(units) The mean sample pressure, calculated from the measurements that are valid for the site. The
pressure is given in units defined by the "Units for pressure measurement" parameter on the
Pressure Calculation screen.
Level 1 Standard
Deviation Standard deviation, in ppm, of the samples used to calculate the mean concentration for the site.
Level 2 Mean
Conc. (ppm) The mean trace gas concentration, in ppm, calculated from the measurements that are valid for
level 2.
Level 2 Conc.
Slope (ppm/scan) The time rate of change of trace gas concentration, in ppm/scan, for level 2.
Level 2 Mean
Pressure (units) The mean sample pressure, calculated from the measurements that are valid for level 2. The
pressure is given in units defined by the "Units for pressure measurement" parameter on the
Pressure Calculation screen.
Level 2 Standard
Deviation Standard deviation, in ppm, of the samples used to calculate the mean concentration for level 2.
3.6.5 Housekeeping Data File
In addition to the 10 Hz data file, all available data are saved to the disk once a minute. The file, MMDDHHMM.MIN,
is created at the same time the 10 Hz data collection file is created, and is stored in the default data directory. This file is
intended to help document the status of the analyzer and for troubleshooting if something goes wrong. The data are
stored in ASCII (plain text) format.
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