HOBO MX2300 Series Data Logger Manual
1-508-759-9500 (U.S. and International) 6
www.onsetcomp.com
1-800-LOGGERS (U.S. only)
details on plotting and viewing the event. In addition, if
you stop the logger with a button push while in burst
logging mode, a New Interval event is automatically
logged and the burst condition is cleared, even if the
actual high or low condition has not cleared.
Statistics Logging
During fixed logging, the logger records data for enabled
sensors and/or selected statistics at the logging interval
selected. Statistics are calculated at a sampling rate you specify
with the results for the sampling period recorded at each
logging interval. You can log the following statistics for each
sensor:
•
The maximum, or highest, sampled value
•
The minimum, or lowest, sampled value
•
An average of all sampled values
•
The standard deviation from the average for all sampled
values
For example, a logger is configured with both the temperature
and RH sensors enabled, and the logging interval set to 5
minutes. The logging mode is set to fixed logging with all four
statistics enabled and with a statistics sampling interval of 30
seconds. Once logging begins, the logger measures and records
the actual temperature and RH sensor values every 5 minutes.
In addition, the logger takes a temperature and RH sample
every 30 seconds and temporarily stores them in memory. The
logger then calculates the maximum, minimum, average, and
standard deviation using the samples gathered over the
previous 5-minute period and logs the resulting values. When
downloading data from the logger, this results in 10 data series
(not including any derived series, such as dew point): two
sensor series (with temperature and RH data logged every 5
minutes) plus eight maximum, minimum, average, and standard
deviation series (four for temperature and four for RH with
values calculated and logged every 5 minutes based on the 30-
second sampling).
To log statistics:
1.
Tap Devices. Press the Start/Stop button
on the logger
to
wake it up, if necessary.
2.
Tap the logger tile in the app to connect to the logger and
tap Configure & Start.
3.
Tap Logging Mode and select Fixed Logging Mode.
4.
Tap to turn on Statistics.
Note:
Fixed Logging Mode records sensor measurements
taken at each logging interval. The selections you make in
the Statistics section add measurements to the recorded
data.
5.
Select the statistics you want the logger to record at each
logging interval: Maximum, Minimum, Average, and
Standard Deviation (average is automatically enabled when
selecting Standard Deviation). Statistics are logged for all
enabled sensors. In addition, the more statistics you record,
the shorter the logger duration and the more memory is
required.
6.
Enter a value in Statistics Sampling Interval to use for
calculating statistics. The rate must be less than, and a
factor of, the logging interval. For example, if the logging
interval is 1 minute and you select 5 seconds for the
sampling rate, the logger takes 12 sample readings between
each logging interval (one sample every 5 seconds for a
minute) and use the 12 samples to record the resulting
statistics at each 1-minute logging interval. Note that the
faster the sampling rate, the greater the impact on battery
life. Because measurements are being taken at the statistics
sampling interval throughout the deployment, the battery
usage is similar to what it would be if you had selected this
rate for the normal logging interval.
Setting a Password
You can create an encrypted password for the logger that is
required if another device attempts to connect to it. This is
recommended to ensure that a deployed logger is not
mistakenly stopped or purposely altered by others. This
password uses a proprietary encryption algorithm that changes
with every connection.
To set a password:
1.
Tap Devices. Press the Start/Stop button
on the logger
to
wake it up, if necessary. Tap the logger tile in the app to
connect to it.
2.
Tap Lock Logger.
3.
Type a password and then tap Set.
Only the device used to set the password can then connect to
the logger without entering a password; all other devices are
required to enter the password. For example, if you set the
password for the logger with your tablet and then try to
connect to the logger later with your phone, you must enter
the password on the phone but not with your tablet. Similarly,
if others attempt to connect to the logger with different
devices, they are also required to enter the password. To reset
a password, press the circle on the logger for 10 seconds or
connect to the logger and tap Manage Password and tap Reset.
Downloading Data From the Logger
To download data from the logger:
1.
Tap Devices. Press the circle
on the logger
to wake it up, if
necessary. Tap the logger tile in the app to connect to the
logger.
2.
Tap Download Data. The logger downloads data to the
phone, tablet, or computer.
3.
Once the download is complete, tap Done to return to the
previous page or tap Export and Share to save the file in the
specified format.
4.
When the export file has successfully been created, tap
Done to return to the previous page or tap Share to use
your device’s usual modes of sharing.
You can also upload data automatically to HOBOlink, Onset’s
web-based software, using the app or the MX gateway. For
details, see the HOBOconnect User Guide and see the HOBOlink
help for details on working with data in HOBOlink.
Logger Events
The logger records the following internal events to track logger
operation and status. You can view events in exported files or
plot events in the app.
