Appendix F: Methods and Calculation Details
X-320M™ User's Manual
Dew Point
Dew Point is based on Temperature and Humidity. The most recent Temperature and Humidity values
are used for this calculation.
Dew Point will only be calculated when the Temperature is between 0ºC - 60ºC, and the Humidity is
greater than or equal to 1%RH. Otherwise, Dew Point will display “--”.
Note: If the calculated Dew Point is greater than 50ºC it will not be displayed.
The following equation is used to calculate the Dew Point:
Dew Point
=
b
∗α(
T , RH
)
a
−α(
T , RH
)
α(
T , RH
)=
a
∗
T
b
+
T
+
ln
(
RH
)
a
= 17.27
b
= 237.7 ºC
T
= Temperature in Celsius
RH
= Relative Humidity
Wind Gust
A Wind Gust is a sudden, brief increase in Wind Speed, typically lasting less than 20 seconds with
speed greater than 10 knots above lulls.
X-320M™ measures the Wind Speed over a two second period. This is considered a sample value used
in the running average. A gust is detected when the wind velocity exceeds 10 knots (11.5 mph, 18.54
kph) above the lowest Wind Speed sample within the Averaging Period. By default, the Averaging
Period is 2 minutes. The gust must last less than 20 seconds. Longer duration sustained winds are not
considered gusts.
A Wind Gust lasting 19 seconds may have several speed values throughout the duration. These are
displayed in the order that they occur. The first value will not be displayed until 20 seconds after it was
captured.
Note: If no Averaging Period is used (Avg. Period = 0), Wind Gusts will not be reported.
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