Campbell ET101, Instruction Manual, Page: 8 / 38

SECTION 1. PREPARATION AND SITING
1-4
Collectors should be heated, if necessary, 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:
1.0 m ± 1.0 cm (AASC)
30.0 cm minimum (WMO, EPA)
1.3.4 SOLAR RADIATION
Pyranometers should be located to avoid
shadows on the sensor at any time. Mounting it
on the southern most (northern hemisphere)
portion of the weather station will minimize the
chance of shading from other weather station
structures. Reflective surfaces and sources of
artificial radiation should be avoided. The height
at which the sensor is mounted is not critical.
1.3.5 SOIL TEMPERATURE
The measurement site for soil temperature should
be at least 1 m
2
and typical of the surface of
interest. The ground surface should be level with
respect to the immediate area (10 m radius).
Standard measurement depths:
10.0 cm ± 1.0 cm (AASC)
5.0 cm, 10.0 cm, 50.0 cm, 100.0 cm (WMO)
REGCOMENDED Feed SENSORS
Po rtland Or U SA
Serial 27115
REGCOMENDED Feed SENSORS Portland Or USA Serial 27115 REGCOMENDED Feed SENSORS
Portland Or USA Serial 27115 27115
H
10H
10T
Height of tree (T)
FIGURE 1.3-1. Effect of Structure on Wind Flow