HOBO TidbiT MX Temp 400 (MX2203) and Temp 5000 (MX2204) Logger Manual
1-508-759-9500 (U.S. and International) 5 www.onsetcomp.com
1-800-LOGGERS (U.S. only)
Burst Logging
Burst logging is a logging mode that allows you to set up more
frequent logging when a specified condition is met. For
example, a logger is recording data at a 5-minute logging
interval and burst logging is configured to log every 30 seconds
when the temperature rises above 85°F (the high limit) or falls
below 32°F (the low limit). This means the logger records data
every 5 minutes as long as the temperature remains between
85°F and 32°F. Once the temperature rises above 85°F, the
logger switches to the faster logging rate and records data
every 30 seconds until the temperature falls back to 85°F. At
that time, logging then resumes every 5 minutes at the fixed
logging interval. Similarly, if the temperature falls below 32°F,
the logger switches to burst logging mode again and records
data every 30 seconds. Once the temperature rises back to
32°F, the logger returns to fixed 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. If the logger was configured with Bluetooth
Always Off enabled, press the HOBOs button on the logger
to wake it up. If the logger was configured with Bluetooth
Off Water Detect and is currently underwater, remove it
from the water.
2. Tap the logger tile to connect to it and tap Configure &
Start.
3. Tap Logging Mode and then tap Burst Logging.
4. Select Low and/or High and type a value to set the low
and/or high levels.
5. 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 effect on battery life and the
shorter the logging duration. Because measurements are
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 fixed logging interval.
Notes:
•The high and low burst limits are checked at the burst
logging interval rate whether the logger is in fixed 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.
•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 than 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 fixed 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 fixed 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, 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 the
temperature sensor 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:
•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, the logging interval is 5 minutes. The logging
mode is set to fixed interval logging and all four statistics
enabled, and with a statistics sampling interval of 30 seconds.
Once logging begins, the logger measures and records the
actual temperature values every 5 minutes. In addition, the
logger takes a temperature 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
log the resulting values. When downloading data from the
logger, this results in five data series: one temperature series
(with data logged every 5 minutes) plus four maximum,
minimum, average, and standard deviation series (with values
calculated and logged every 5 minutes based on the 30-second
sampling).
To log statistics:
1. Tap Devices. If the logger was configured with Bluetooth
Always Off enabled, press the HOBOs button on the logger
to wake it up. If the logger was configured with Bluetooth
Off Water Detect and is currently underwater, remove it
from the water.
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.
