mru SWG 100 biogas, Руководство пользователя

Страница: 71 / 141

MRU GmbH SWG 100 User Manual
Page 71 of 141
General information about the data storage
Data storage strategy is as follows:
•
The analyser may store up to 20,000 measurement points (including all
relevant data).
•
At the end of each measurement cycle (per sampling point) the current
values will be stored.
•
The memory is used as a ring buffer. As soon as the memory is completely
occupied, the latest measurements will replace the oldest measurements.
Specifically:
If the used memory is 99%, then the oldest 20% of the measurements will
automatically be exported to SD card in CSV format and then deleted from the
memory. In case the SD card export doesn't succeed (SD Card missing or read-only),
then only the oldest 4% of the measurements will be deleted. The file names reflect
the date of the most recent measurement contained in the export file, e.g.
"20141031.csv".
Example:
An analyser with 2 sample points and a total configured cycle time of 32 minutes
saves 2 * 24 * 60/32 = 90 measurements per day (45 of each sample point). So the
ring buffer will provide measurements of the last 20000/90 = 222 days (more than 7
months).
View stored measurements in text mode
This function can be reached from the Data Storage Menu by selecting one or all
sample points and by pressing F1='view text':
When entering the menu the latest stored measurement will be displayed. With the
keys F1='previous' and F3='next' the measurements can be browsed (
F3
will lead to
the oldest measurement when the latest was displayed before - wrap-around).
You may delete a single measurement here, usually you won't need this function.
The arrow keys have the same function than in the measurement menu.
View stored measurements in graphic mode
This function can be reached from the Data Storage Menu by selecting one sample
point (not all) and by pressing
F3='view graph'
:
Two curves for one pair of data are shown at the same time in one diagram. The
used scales are determined automatically and can't be changed by the user.
The offered pairs of data are determined by the setting of the zoom values in the
measurement menu. The displayed pair of data can be changed by pressing the
arrow keys up or down.
When entering the menu the measurements of the last 24 hours will be displayed.
This interval can be changed by pressing the keys
F1
=more or
F3
='less'.
Export of measurements to SD card
This function is used to export the measurements from the analyzer to a PC. The
used format is CSV (comma-separated values). Many computer programs are able
to read this format, e.g. spread sheet calculation programs.