Situations to avoid include:
l
Industrial heat sources
l
Rooftops
l
Steep slopes
l
Sheltered hollows
l
Tall vegetation
l
Shaded areas
l
Swamps
l
Areas where snow drifts occur
l
Low places holding standing water after rainstorms
Standard measurement heights:
l
1.5 m ± 1.0 m (AASC)
l
1.25 to 2.00 m (WMO)
l
2.0 m temperature (EPA)
l
2.0 m and 10.0 m for temperature difference (EPA)
4.3 Precipitation
Rain gages must be sited on level ground covered with short grass or gravel. In open areas,
choose a site where the distance to any obstruction is two to four times (EPA, AASC) the height
of the obstruction.
Position the height of the opening as low as possible, but high enough to avoid splashing from
the ground. Wind shields, such as Campbell Scientific 260 953 Alter-Type Rain Gage Wind
Screen, are recommended for open areas.
When necessary, use heated collectors to properly measure frozen precipitation. The gage must
be mounted above the average level of snow accumulation in areas that experience significant
snowfall.
Standard measurement heights:
l
1.0 m ± 1.0 cm (AASC)
l
30.0 cm minimum (WMO, EPA)
4.4 Solar radiation
Mount pyranometers in locations that avoid shadows on the sensor at any time. Mounting the
sensor on the southernmost (Northern Hemisphere) portion of the weather station will minimize
UT20 and UT30 Universal Towers
5
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...
