Dataflow Systems PTY Ltd
Calibration.
The orifice of the rain gauge is 6.5 inches or 165.1 millimeters. Before calibrating the
rain gauge makes sure the bucket surfaces are clean.
The standard calibration is in millimeters. The Davis tipping bucket may be set up in
imperial or metric measurements. Ensure that the metric measurement adaptor has
been fitted. Instructions are in the Davis manual supplied with the rain gauge.
Open the Tipping Bucket Rain Gauge calibration file in the Odyssey software.
Measurement units are in mm. Enter the following data in the calibration table.
Un-calibrated Value Measured Value
First Value 0 0
Second Value 233 46.6
Relative Value 0
No. Decimal places
Finally, save the calibration file.
The Davis Tipping Bucket Rain Gauge is factory calibrated and should not normally
require any attention other than keeping it clean. The mechanical adjustments should
not have to be altered. If the calibration appears to be significantly in error, put a
calibrated rain gauge of at least 100 mm diameter within 600 mm of the one under test
and compare the readings over a period of time. A significant rainfall event will give the
best results.
Calculate the number of tips by first downloading the logged data and then editing the
site data and recording the number of scans.
Each scan represents one tip. The column R.G.Tip also shows each tip. Enter the
number of tips in the un-calibrated column and the rainfall measurement in the
measured value column of the Calibration File.
Alternative Method of Calibration.
The following method of calibration may be used; however its accuracy leaves much to
be desired as the drip rate can sometimes flood the buckets giving far fewer tips than
what is expected.
A plastic container big enough to hold one litre of water is required to carry out a
calibration. The container should have a 1mm hole drilled in the bottom of the container
at the lowest point, if the base of the container is not flat.
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