 Calibration
Devices: Precipitation
The Model 60103 Precipitation Gauge Calibrator is designed for easy field
checks on the calibration of tipping bucket gauges, but it can be used for
laboratory calibration procedures as well. The calibrator consists of a plastic
bottle to hold water, a stand to set the bottle in the gauge funnel, and a
constant head orifice assembly. A measured amount of water, equal to 100 tips
of the bucket assembly, is directed into the gauge at a constant rate of 2
inches/hour. If the readout device attached to the gauge records more or less
than 100 tips, recalibration should be considered.
This calibration method provides the greatest accuracy and repeatability
possible because it is based on an average over 100 tips. In addition, the
60103 is unbreakable and therefore better suited to field use than fragile
pipettes or graduated cylinders. A fill line is indicated on the water bottle
for ease of use. However, for maximum accuracy the amount of water added to
the bottle can be determined using a laboratory balance.
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