Xylem RG200 RAIN GAUGE, 6 inch (TIPPING BUCKET) - Manual (Page 8)

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VI. Tipping Bucket Calibration Check
a. Obtain a plastic or metal container of at least one-quart capacity.
Place a very small hole in the bottom of the container.
b. Place the can in the tipping bucket funnel.
c. Pour exactly 27.9 ounces of water into the can.
d. If it takes less than 45 minutes for the water to run out, then the hole in
the container is too large.
e. Rough field calibration of this sort should result in one hundred tips, +
three.
f. Adjusting screws are located under the tipping bucket mechanism on
the base plate. Adjust both screws equally, i.e. if you turn one a half
turn then turn the other a half turn. Turning the screws clockwise will
increase the number of tips per 27.9 ounces of water. Turning the
screws counter-clockwise decreases number of tips per 27.9 ounces
of water. One half turns of both screws normally results in a change of
2-3%.
VII. Tipping Bucket Specifications
Resolution: 0.01 inches
Accuracy: 3% up to 4”/hr
Average Switch Closure Time: 135 ms
Maximum Bounce Settling Time: 0.75 ms
Maximum Switch Rating:
30 VDC @ 0.2 amps
Operating Temperature: 0° to +51°C
Size of Gauge: 6”x15”
Weight: 2.0 lb.