21
H.
Data
Logger
1.
Description:
If installed and enabled, the data logger records each gas sensors reading and
temperature sensor reading. The frequency of recording is adjustable. The data is recorded on
a MicroSDHC memory card located inside the gas alarm enclosure on the MB220 board. The
MicroSDHC memory card is installed in the slot (See Figure 5). Data can be read using a text-
reader program or imported into a spreadsheet program. To use the data logger the controller
must be provided with the MJ500 Real Time Clock board (which mounts directly on the MB220
board as shown on Figure 5).
2.
Operation:
To enable the data logger, enter the confi guration menu and select the option “DL”.
The fi rst menu option that appears will be the On/Off menu to enable/disable the data logger.
The menus that follow allow for adjustment of data recording frequency and for changes to the
clock (date and time). See Figure 10.
a.
Frequency:
The frequency is the time interval between data recordings. The frequency is
adjustable in seconds, with a minimum setting of 5 seconds.
b.
Data Logger Clock:
The clock is factory-set before shipment. However, because the clock
is set on Eastern Standard time it may be necessary to change the date and time upon start-up.
3.
Stored Data Files:
The data will be written to text fi les on the MicroSDHC memory card. The
formatting and handling of these fi les is as described below:
a.
File Format:
The following is an example data fi le to illustrate the format used. As you can
see, there is a three line header for each fi le. The fourth and fi fth lines are headers for the
data. You will see that each header and data entry is delimited by a comma.
b.
File Name:
Each data fi le will be named according to the date on which it was created. For
example if created on May 24, 2017, the fi le name would be May24_17.txt
i. If the MicroSDHC memory card already has a fi le started earlier on the same day, then
data will be written onto the existing fi le.
ii. The text fi les are limited to 5 MB. Once this limit has been reached, a new fi le will
automatically be created to allow data to continue to be written.
c.
Importing data into a spreadsheet:
The data fi les can be imported into a spreadsheet
program. The data format is ‘comma separated values’.
