RKI Instruments GX-2012 - Manual (Page 50)

46 • Viewing, Printing, Exporting, & Deleting Data in the Data Window
Interval Trend Data
Average gas concentrations over the user defined interval trend time are
logged in the interval trend data files. The interval trend time can be set in
the Set window. See “Changing Instrument Parameters” on page 73. It can
also be set in the instrument’s Maintenance Mode. See the GX-2012
Operator’s Manual or the Gas Tracer Operator’s Manual for instructions to
set the interval trend time. Events such as gas alarms or sensor failures
are saved in the interval trend data file when they occur.
When the user ID of the instrument is changed during operation, a new
interval trend file is created. When the station ID of the instrument is
changed during operation, is it shown as an event in the interval trend file.
A new interval trend file is not created for a station ID change done during
operation.
An interval trend data file is created and saved in the instrument when the
instrument is turned off. The serial number, user ID, and station ID that are
entered in the instrument when it is turned on are saved for the
corresponding interval trend file. If the instrument’s serial number, user ID,
or station ID are changed in the Set window, any interval trend files that
result from subsequent operating sessions will have the new serial number,
user ID, or station ID saved in them.
The data may be viewed either in table format or graph format if at least 5
scheduled data points have been logged at the programmed interval trend
time. This does not include events. If an interval data file has fewer than
five scheduled data points, the graph controls are not functional and the
data cannot be graphed.