Vaisala AWS330 - Manual (Page 89)

Chapter 4 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 87
Installing Rain Gauge RG13(H)
Vaisala Rain Gauge RG13(H) features a tipping-bucket mechanism that
produces a contact closure every time the gauge receives a predetermined
small quantity of rainfall (for example, 0.2 mm, depending on the
model). The body and the funnel of the gauge are aluminum alloy. In
RG13H, a heater element switches on at temperatures below +4 °C to
melt possible snowfall and keep the moving parts from freezing. The rain
gauge is installed on a stand.
The opening of the gauge must be in a horizontal plane, open to the sky,
and above the level of in-splashing and snow accumulation. Objects
should not be closer to the gauge than a distance four times their height
above the gauge orifice.
In areas of dense vegetation, the height of the vegetation should be kept
well below the gauge opening level by regular clipping. Avoid sites on a
slope or on building roofs. Hard flat surfaces, such as concrete, should
also be avoided to prevent in-splashing.
To mount the gauge and the stand, proceed as follows:
1. Drill holes to a concrete pad according to Figure 45 below. You
can use the bottom plate of the stand as a guide when drilling.
0504-047
Figure 45 Installation Hole Placement for Rain Gauge
Stand
2. Attach the stand (number 3 in Figure 46 on page 89) to the
foundation with wedge bolts (6) and a hammer.