Specifications

Section 11. Programming Resource Library
11-27
For most applications, total power usage of 318 mA for 15 seconds is not
excessive, but if 16 probes were wired to the same SDI-12 port, the resulting
power draw would be excessive. Spreading sensors over several SDI-12
terminals will help reduce power consumption.
11.4 Subroutines
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11.5 Wind Vector
11.5.1 OutputOpt Parameters
In the CR1000 WindVector() instruction, the OutputOpt parameter is used to
define the values which will be stored. All output options result in an array of
values, the elements of which have “_WVc(n)” as a suffix, where n is the
element number. The array uses the name of the Speed/East variable as its
base. TABLE 11.5-1 lists and describes OutputOpt options.
TABLE 11
.5-1. OutputOpt Options
Option Description
0 WVc(1) = Mean horizontal wind speed (S)
WVc(2) = Unit vector mean wind direction (Θ1)
WVc(3) = Standard deviation of wind direction σ(Θ1). Standard
deviation is calculated using the Yamartino algorithm. This option
complies with EPA guidelines for use with straight-line Gaussian
dispersion models to model plume transport.
1 WVc(1) = Mean horizontal wind speed (S)
WVc(2) = Unit vector mean wind direction (Θ1)
2
WVc(1) = Resultant mean horizontal wind speed (
U
)
WVc(2) = Resultant mean wind direction (Θu)
WVc(3) = Standard deviation of wind direction σ(Θu). This
standard deviation is calculated using Campbell Scientific's wind
speed weighted algorithm. Use of the resultant mean horizontal wind
direction is not recommended for straight-line Gaussian dispersion
models, but may be used to model transport direction in a variable-
trajectory model.
3
WVc(1) = Unit vector mean wind direction (Θ1)
4
WVc(1) = Unit vector mean wind direction (Θ1)
WVc(2) = Standard deviation of wind direction σ(Θu). This
standard deviation is calculated using Campbell Scientific's wind
speed weighted algorithm. Use of the resultant mean horizontal wind
direction is not recommended for straight-line Gaussian dispersion
models, but may be used to model transport direction in a variable-
trajectory model.