TB4 and TB4MM Tipping Bucket Rain Gages
7
7.3 Siting
Mount the rain gage in a relatively level location representative of the
surrounding area. Ensure that the orifice is horizontal, at least 1 m above the
ground. The ground surface around the rain gage should be natural vegetation
or gravel, not paved.
Place the rain gage away from objects that obstruct the wind. The distance
should be 2- to 4-times the height of the obstruction.
7.4 Mounting
The TB4 have three equally-spaced pads for mounting the tipping buckets on a
flat surface. Each pad includes a hole that fits a 3/8 inch (M8) bolt. The three
holes form a 234 mm (9.21 in) diameter bolt circle.
Campbell Scientific offers the CM240 mounting bracket for installing and
leveling the TB4. The CM240 may be attached to a CM300-series mounting
pole or to a user-supplied 1.5 inch IPS (1.9 inch OD) unthreaded pipe.
The pole or pipe can be placed directly into a concrete foundation (FIGURE
), or attached to a concrete foundation using J-bolts or self-supporting legs
). A concrete pad is recommended, but it should not be installed
over large paved or concrete surface.
FIGURE 7-2. Rain Gage Installation (pole embedded in concrete)
61 cm
(24 in)
20.3 cm
(8 in) dia.
CM240
CM310
142 cm (56 in)
mounting pole
