DAVIS WeatherLink 5.0 Especificações Página 16
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• Trending allows you to determine whether a particular variable is
approaching a value of concern. It is like a “predictive” alarm. If the
number you enter in the first edit box is lower than the number you enter
in the second box, the data logger will check for an upward trend.
Likewise, if the number in the first edit box is higher than the number
you enter in the second box, the data logger will check for a downward
trend. The third edit box is used to indicate the maximum period of time
that may elapse before this alarm is no longer valid.
For this type of alarm to be valid, the parameter of interest must pass
through both thresholds within the specified time period. If the
parameter is between the thresholds when the alarm is set, or above the
higher threshold for an upward trend alarm or below the lower threshold
for a downward trend alarm, the alarm will not become active. Please
note that frequent communication with the data logger will cause the
timing function of this alarm type to run long.
For guidance on how to use this alarm, it may be best to consult
historical weather data from WeatherLink plot data (or other sources) to
determine what kind of behavior a parameter exhibits before approaching
a value of concern. Make note of how quickly the value changes over
time before it reaches that value. These changes will govern your
threshold values and time period. Your second threshold probably
should not match this value, but rather be lower than this value for a
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