HOBO MX CO
2
Data Logger (MX1102A) Manual
Choosing Logger Settings
The following table lists the available settings when configuring
the logger with the app or HOBOware.
Logger Setting
Action
Name
Enter a name for the logger up to 20 characters.
This name will be used as the file name. A name
also helps identify the logger in the Loggers screen
in the app. If no name is entered, the logger serial
number is used.
Group (the app
only)
Add the logger to a group to help identify the
logger.
Logging Interval
Select how often the logger will record data.
Start Logging
Options
Choose one of the following:
•
Now.
Logging will begin
immediately after
configuration settings are loaded on the logger.
•
On Next Logging Interval.
Logging will begin at
the next even interval as determined by the
selected logging interval.
•
On Button Push.
Logging will begin 15 seconds
after you press the Start/Stop logging button on
the logger for 3 seconds.
•
On Date/Time.
Logging will begin at a date and
time you specify.
Stop Logging
Options
Choose a memory option:
•
When Memory Fills.
The logger will continue
recording data until the memory is full.
•
Never (Wrap When Full).
The logger will
continue recording data indefinitely, with
newest data overwriting the oldest. This option
is not available if the Logging Mode is set to
Burst (see
Burst Logging
).
Choose this stop logging option if desired:
•
On Button Push.
Select this if you want to be
able to stop logging by pushing the Start/Stop
button on the logger.
Choose a Stop Logging time-based option.
•
Never.
Select this if you do not want the logger
to stop at any predetermined time frame.
•
On Date/Time.
Select this if you want the logger
to stop logging on a specific date and time.
Select the date and time.
•
After.
Select this if you want to control how
long the logger should continue logging once it
starts. Choose the amount of time you want the
logger to log data. For example, select 30 days if
you want the logger to log data for 30 days after
logging begins.
Logging Mode
Choose a logging mode:
•
Fixed Logging.
The logger will record data for all
enabled sensors at the selected logging interval.
•
Burst Logging.
In burst mode, logging occurs at
a different interval when a specified condition is
met. See
Burst Logging
for more information.
•
In the app, select Normal if you want the logger
to log current readings. Select each statistic you
want the logger to log.
In HOBOware, select Statistics and then select
Current Reading if you want sensor readings to
be logged. Select each statistic you want the
Logger Setting
Action
logger to log.
Current readings and statistics are logged at the
logging interval rate. See
Statistics Logging
for
more information.
Show LCD
Enable or disable to control whether the LCD
remains illuminated while the logger is logging. If
you disable the LCD, the logger will not show the
current reading, status, or other information while
the logger is logging. You will, however, be able to
temporarily turn the LCD screen on by pressing the
Start/Stop button on the logger for 1 second.
Sensor & Alarm
Setup
Enable the sensor measurement types that will be
logged: temperature, RH, and/or CO
2
. Both
temperature and RH are required to calculate dew
point, which is an additional data series available
for plotting after reading out the logger. You can
configure alarms for sensors. See
Setting up
Alarms
. If logging CO
2
, you can select calibration
settings. See
Calibrating the Logger
.
Calibrating the Logger
The CO
2
sensor in the logger requires altitude compensation
and regular calibration to ensure accurate readings are being
taken in the location where it is deployed. Both auto and
manual calibration are selected by default when first
configuring the logger. Altitude compensation should be used if
you are monitoring CO
2
at elevations above or below 305
meters (1,000 feet).
Some CO
2
measurement drift may occur during shipment and
storage. A manual calibration immediately after logging begins
is recommended for best accuracy.
Important:
If performing a manual calibration, be sure to follow
the instructions later in this section. Improper manual
calibration can result in incorrect sensor readings.
The following CO
2
settings are available in both the app and
HOBOware:
•
Manual calibration.
Manual calibration is the best way to
calibrate your logger. Use this option if you want to
manually calibrate the logger to 400 ppm using the
Calibrate button on the logger. This requires taking the
logger outside in fresh air on a dry day or to an indoor
location that is unoccupied and has no connection to a
ventilation system for five minutes on a regular basis.
Press the Calibrate button on the logger for 5 seconds to
manually calibrate the CO
2
sensor. “Calibrate” and “CO
2”
will blink on the LCD during the 5-minute manual
calibration process in which 300 measurements are taken
to get the average and create the offset from 400 ppm.
(See the steps later in this section for more details on
manual calibration.) This is recommended if the logger is
deployed in a building that is always occupied, if you want
the logger to be calibrated more frequently than every
eight days (the normal auto calibration schedule), or if you
want to calibrate the logger immediately after logging
begins.
Note:
Once a manual calibration is performed, the
24-hour auto calibration is canceled and an auto
calibration will be performed eight days from the time the
manual calibration occurred.
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