Vaisala WAA151 Installation Manual Page 38

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Installation Manual __________________________________________________________________
36 ___________________________________________________________________ M010114en-B
RG13H
0105-017
Figure 20 RG13H Rain Gauge
The RG13H heated tipping bucket type rain gauge provides a well-
proven and reliable method of monitoring rainfall also at temperatures
below 0 °C. The gauge has a body and funnel of aluminum alloy, with
an accurately machined septum-ring at the top to give an aperture of
400 cm
2
. Bucket mechanism is mounted inside the body on a cast
aluminum-alloy base incorporating fixing lugs, three leveling screws
and a spirit level. The RG13H is equipped with integral heater. The
heater switches on at temperatures below +4 °C. The heater power
consumption is 38 W/40 VDC.
The rain gauge comprises a divided bucket assembly, which is pivoted
at its center like a seesaw. Rain collects in the upper half of the
bucket, which is adjusted to tilt when a predetermined amount of
water has been collected. The tilting action discharges the collected
water, and repositions the opposite half under the discharge nozzle
ready for filling. The bucket tips are monitored by means of a magnet,
which energizes a reed switch capable of a virtually indefinite amount
of operations. This system ensures that the tipping bucket has a long,
reliable working life.
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