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Chapter 4 Preparing LogTags for use 37
Enable pre-start logging Pre-start logging is a feature that protects the recording in the
event of a failure to actually press the START MARK button to
initiate the recording. It is an insurance policy against the loss of
critical data. This is almost always checked for transit monitoring
applications. This option is further explained in the section "
Pre
start data collection
".
Record readings
continuously, overwrite
oldest when memory
full
This is what is called a “data wrap” in which the recorder just keeps
writing data to memory. It is a “moving window” of data. For
example, this is useful for fixed base MKT monitoring with the
interval set to one year, so that the current “yearly MKT” can
always be in the memory of the LogTag. If this option is selected,
the user will be “opted out” of the next two options. This option is
further explained in the section "
Continuous operation
".
Record readings so
that:
If this is selected, the logger stops logging when the number of
data points has been gathered and stored in memory that spans at
least the number of days specified below. When this option is
selected, the following two options will determine the number of
data points over the span of time that will be recorded.
Readings recorded will
span at least X days
If you know how long you want to record, the Configuration screen
will automatically set the number of readings to be collected at a
particular interval. This setting will only have an effect if the above
option "Record readings so that:" is selected.
Number of readings to
record X maximum is Y
This data box will display the calculated number of readings if you
select a time span and an interval. Alternatively, you can select the
number of readings desired, and the time span will be altered
based on the interval. If this is selected, the logger will stop logging
when the number of readings has been gathered and stored in
memory. "Y" represents the maximum number of readings the
LogTag can store, however with a selected interval and a selected
time span, you may not need to use all of the available data space.
This setting will only have an effect if the above option "Record
readings so that:" is selected.
Record a reading every
X
This determines how frequently the LogTag records the
environmental humidity and/or temperature into its internal
memory.
Begin recording after a
delay of X
Determines how long after the START MARK button on the LogTag
has been pressed that it will actually begin to record the
environment humidity and/or temperature. This feature is useful for
example, when the LogTag could falsely trigger an alert because
the environmental conditions it is being started in is quite different
to the environmental conditions to be monitored. If pre-start
logging is enabled, the LogTag will continue to record pre-start
readings during this delay.
Enable the OK (Green)
indicator
This determines whether or not the green light should function
while the LogTag is recording after being started.
Humidity / Temperature These tab controls will allow the humidity and temperature alert
conditions to be configured independently. These tab controls will
only appear when configuring a LogTag that has a humidity and a
temperature sensor. If the LogTag has only one sensor then the
following alert conditions will apply to that sensor.