HOBO Pendant MX Temp (MX2201) and Temp/Light (MX2202) Logger Manual
1-508-759-9500 (U.S. and International) 5
www.onsetcomp.com
1-800-LOGGERS (U.S. only)
data every 30 seconds. Once the temperature rises back to
32°F, the logger then returns to normal mode, logging every 5
minutes.
Note:
Sensor alarms, statistics, and the Stop Logging
option Never Stop (Overwrites Old Data) are not available in
burst logging mode.
To set up burst logging:
1.
Tap Devices. Press the button
on the logger
to wake it up (if
necessary).
2.
Tap the logger tile in the app to connect to it and tap
Configure & Start.
3.
Tap Logging Mode and then tap Burst Logging.
4.
Set the burst logging interval, which must be faster than the
logging interval. Keep in mind that the faster the burst
logging rate, the greater the impact on battery life and the
shorter the logging duration. Because measurements are
being taken at the burst logging 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.
5.
Select Low and/or High and type a value to set the low
and/or high values.
6.
Repeat step 5 for the other sensor if desired.
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 always checks for burst limits every
10 minutes.
•
If high and/or low limits have been configured for more
than one sensor, then burst logging begins when any high
or low condition goes out of range. Burst logging does
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. 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 from the value
entered.
•
Once the high or low condition clears, the logging
interval time is 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 is 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, 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 specified logging
interval. 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 Pendant MX Temp/Light (MX2202) logger is
configured with both the temperature and light sensors
enabled, and the logging interval set to 5 minutes. It is set to
Fixed Logging Mode with all four statistics enabled and a
statistics sampling interval of 30 seconds. Once logging begins,
the logger measures and records the actual temperature and
light values every 5 minutes. In addition, the logger takes a
temperature and light 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: 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 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 it and tap
Configure & Start.
3.
Tap Logging Mode and then 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
