EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
49
table and changing the value in the
sonic_azimuth
field. Note that if the units
of the variables are being displayed in the field, the units must be deleted
before entering a value. If a new value is attempted to be sent along with the
units in the field, then a change will not be made. To change it on the keypad,
go to the
Site Var Settings
menu, then go to
sonic_azimuth
and enter a new
value. Once a value is entered, the value is saved in the CPU. The program
default of
0
for
sonic_azimuth
is used only if a site-specific value has not been
entered using the keyboard or through
LoggerNet
.
and FIGURE
show the compass and sonic coordinate
system. Both figures show the sonic’s negative x-axis pointing to the west
(compass azimuth of 270°). The wind direction is measured in degrees
clockwise from due north. In the compass coordinate system, the wind
direction (
WD
) is 200. To calculate the wind direction in FIGURE
, the
orientation of the sonic anemometer relative to due north is needed in the
program. FIGURE
is in a right-handed coordinate system, and the wind
vector direction is measured in degrees counterclockwise from the positive x-
axis. Therefore, the wind vector direction (
WD_sonic
) is 70°.
FIGURE 10-1. Compass coordinate system, compass wind direction is
200°. The sonic azimuth of the anemometer is 270°
Содержание EC155
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