Xylem RG600 TIPPING BUCKET RAIN GAUGE, 8 INCH - Manual (Page 5)

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VII. 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. Place the can
in the tipping bucket funnel and pour exactly 27.9 ounces of water into
the can. If it takes less than 45 minutes for the water to run out, then
the hole in the container is too large.
b. Rough field calibration of this sort should result in one hundred tips, +
three. Adjusting screws are located under the tipping bucket
mechanism on the base plate. Adjust both screws equally, i.e. if you
turn one screw one-half turn then turn the other one-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 turn of both screws normally
results in a change of 2-3%.
VIII. Specifications
Resolution: 0.01 inches or .2mm
Accuracy: +1% at 1” per hour
Average Switch Closure Time: 135 ms
Maximum Bounce Settling Time: 0.75 ms
Maximum Switch Rating: 30 VDC @ 0.2A
Operating Temperature: 0° to +51°C
Size of Gauge: 10 1/8” x 8”
Weight: 2.5 lb.
IX. Maintenance
a. The funnel and tipping bucket mechanism should be cleaned
periodically. An accumulation of dirt, bugs, etc. on the tipping bucket
will adversely affect the readings.