
ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048 Page D-24
TTaTT
T
a
**;
*Jkg;
Jkg K ;
4
61
4
311
2.501 10
2.37 10
(13)
where the temperatures are given in Kelvin and the value is related to the value at T* = 273.15K.
Air Density
This is related to the air density
0
at 273.15 K and sea level through:
AT T
T
T
A
a
T
,*
*
exp ;
* . kgm ;
0
3
0
3
1291
(14)
where a
3
takes the same value (8500m) as in equation (11).
2.9. Free Running Wind Vector Average
Inputs: 4 Wind speed sensor, process or constant output
5 Wind direction sensor, process or constant output
6 Compass sensor, process or constant output (optional)
7 Gust sample window (1 to 5 seconds)
8 Processing interval (minutes)
9 Processing offset (minutes)
Outputs: 1 Vector average wind speed
2 Vector average independent wind direction
3 Average wind speed
4 Most recent wind speed
5 Most recent wind direction
6 Sigma-theta
7 Maximum wind gust
8 Average U-vector
9 Average V-vector
10 Most recent compass
11 Wind gust direction
12 Vector average component wind direction
13 Process completion flag
L1 Time of maximum gust
L2 Process completion time
E1 Process error code
Assumptions: Compass input may be from a sensor, or left as a NULL input. If a
compass is defined, the compass input is used only if the field Add
Compass To Vane—in the System Functions Menu of the User
Interface—is set to YES. In this case, each wind direction value is
adjusted with the latest compass reading. Note that wind direction is the
direction from which the wind is blowing.
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