4.1 Wind speed and direction
As specified by the EPA
1
, wind sensors should be located over open, level terrain at a distance at
least ten times the height of any nearby buildings, trees, or other obstructions as shown in
Standard measurement heights:
l
3.0 m ± 0.1 m recommended (AASC)
l
2.0 m ± 0.1 m, 10.0 m ± 0.5 m optional (AASC)
l
10.0 m (WMO and EPA)
FIGURE 4-1. Effect of a structure on wind flow
4.2 Temperature and relative humidity
Sensors should be located over an open, level area at least 9 m (EPA
1
) in diameter. The surface
should be covered by short grass, or, where grass does not grow, the natural earth surface. Locate
sensors at a distance of at least four times the height of any nearby obstructions and at least 30 m
(EPA
1
) from paved areas. Sensors must be protected from thermal radiation and adequately
ventilated.
UT20 and UT30 Universal Towers
4
Summary of Contents for UT20
Page 1: ...Revision 03 2020 Copyright 1993 2020 Campbell Scientific Inc...
Page 10: ...FIGURE 5 1 UT20 tower UT20 and UT30 Universal Towers 7...
Page 38: ...FIGURE 7 28 Bracket selection UT20 and UT30 Universal Towers 35...
Page 41: ...A B 14 7 Page 1 of 3 A A B B C C 1 2 3 0 1 2 3 3 inch reference...
Page 42: ...C 43 2 cm 17 in A UTBASE Page 2 of 3 A A B B C C 1 2 3 0 1 2 3 3 inch reference...
Page 43: ...C B UTBASE Page 3 of 3 A A B B C C 1 2 3 0 1 2 3 3 inch reference...
