HOBO Pendant MX Temp (MX2201) and Temp/Light (MX2202) Logger Manual
1-800-LOGGERS 6
9.
Tap Done to exit the Logging Mode screen.
10.
Tap Start in the Configure screen to load the burst settings
onto the logger if you are ready to start.
Notes:
•
The high and low burst limits are checked at the burst
logging interval rate whether the logger is in normal or
burst condition. For example, if the logging interval is set
to 1 hour and the burst logging interval is set to 10
minutes, the logger will always check for burst limits
every 10 minutes.
•
If high and/or low limits have been configured for more
than one sensor, then burst logging will begin when any
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. In addition, burst logging can begin or end
when the sensor reading is within the specified
resolution. This means the value that triggers burst
logging may differ slightly than the value entered. For
example, if the high limit for a temperature alarm is set
to 75.999°F, burst logging can start when the sensor
reading is 75.994°F, which is within the range of the
resolution specifications.
•
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 at the normal logging rate. For example, 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
Logger Events
for
details on plotting and viewing the event. In addition, if
the logger is stopped with a button push 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 Pendant MX Temp/Light (MX2202) logger is
configured with both the temperature and light 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 temperature and light values every 5 minutes.
In addition, the logger will take a temperature and light sample
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 10 data series: two
sensor series (with temperature and light data logged every 5
minutes) plus eight maximum, minimum, average, and standard
deviation series (four for temperature and four for light with
values calculated and logged every 5 minutes based on the 30-
second sampling).
To log statistics:
1.
Tap the HOBOs icon and tap the logger to connect to it. If
the logger was configured with Bluetooth Always Off
enabled, press the circle on the logger to wake it up.
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. Do not select this if you only want to log
statistics.
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
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.
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.
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