HOBO MX Water Level Logger (MX2001-0x) Manual
1-800-LOGGERS 9
high or low condition goes out of range. Burst logging will
not end until all conditions on all sensors are back within
normal range.
•The actual values for the burst logging limits are set to
the closest value supported by the logger. For example,
the closest value to 85°F that the logger can record is
84.990°F and the closest value to 32°F is 32.043°F.
•When setting water level limits for burst logging mode,
make sure the water level remains constant from when
the burst limits are set until when the logger is started.
•If you need to change the reference water level during
the deployment, you will also need to re-enter the burst
limits based on the new reference water level.
•Burst logging mode can begin or end when the sensor
reading is within the logger specifications of 0.1°C
resolution. This means the value that triggers burst
logging may differ slightly than the value entered. For
example, if the high limit for a water temperature alarm
is set to 75.999°F, burst logging can start when the sensor
reading is 75.994°F (which is within the 0.1°C resolution).
•Once the high or low condition clears, the logging interval
time will be calculated using the last recorded data point
in burst logging mode, not the last data point recorded in
“normal mode.” For example, let’s assume the logger has
a 10-minute logging interval and logged a data point at
9:05. Then, the high limit was surpassed and burst
logging began at 9:06. Burst logging then continued until
9:12 when the sensor reading fell back below the high
limit. Now back in normal mode, the next logging interval
will be 10 minutes from the last burst logging point, or
9:22 in this case. If burst logging had not occurred, the
next data point would have been at 9:15.
•A New Interval event is created each time the logger
enters or exits burst logging mode. See Internal Logger
Events for details on plotting and viewing the event. In
addition, if the logger is stopped via HOBOmobile while in
burst logging mode, then 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 interval 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. The following statistics can be logged for
each sensor:
•The maximum, or highest, sampled value,
•The minimum, or lowest, sampled value,
•An average of all sampled values, and
•The standard deviation from the average for all sampled
values.
For example, a logger is configured with the absolute pressure,
differential pressure, and water temperature sensors enabled,
and the logging interval set to 5 minutes. The logging mode is
set to fixed interval logging with Normal and all four statistics
enabled and with a statistics sampling interval of 30 seconds.
Once logging begins, the logger will measure and record the
actual absolute pressure, differential pressure, and water
temperature sensor values every 5 minutes as well as calculate
the water level and barometric pressure. In addition, the logger
will take readings for the enabled sensors every 30 seconds and
temporarily store them in memory. The logger will then
calculate the maximum, minimum, average, and standard
deviation using the samples gathered over the previous 5-
minute period and log the resulting values. When reading out
the logger, this would result in 17 data series: 5 sensor-related
series (differential pressure, absolute pressure, barometric
pressure, temperature, and water level with data logged every
5 minutes) plus 12 maximum, minimum, average, and standard
deviation series (four for differential pressure, four for absolute
pressure, and four for temperature with values calculated and
logged every 5 minutes based on the 30-second sampling).
Statistics are not available for barometric pressure and water
level data.
To log statistics:
1. Tap and select a logger in the In Range list to connect
to it.
2. Once connected, tap Configure.
3. Tap Logging Mode and then select Fixed Interval Logging.
4. Select Normal to record the current reading for each
enabled sensor at the logging interval shown at the top of
the screen.
Important: You must select Normal if you want to log water
level and barometric pressure data. If you deselect Normal, the
logger will not be able to calculate water level or barometric
pressure.
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 will be logged for all
enabled sensors. In addition, the more statistics you record,
the shorter the logger duration and the more memory is
required.
6. Tap Statistics Sampling Interval and select the rate 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, then the logger will take 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
more frequent the sampling rate, the greater the impact on
battery life.
7. Tap Done.
8. Tap Done again to exit the Logging Mode screen.
9. Tap Start in the Configure screen to load the statistics
settings onto the logger if you are ready to start.
You can plot the statistics series once you read out the logger.
Note that the logger will always display the current sensor
readings in HOBOmobile even if they are not being logged.
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