DAVIS Rain Collector II for GroWeather, EnviroMonitor, Weather Monitor and Wizard - Manual (Page 8)

Adjusting the Rain Collector II
8
As you reattach the cone, make sure to run the cable to the cable slot in the
base, or the cone will not fit snugly against the base.
10.Place the debris screen, points down, into the cone. The screen prevents large
bits of debris from blocking the funnel hole.
11.To prevent fraying or cutting of the cable where it is exposed to weather, it is
important that you secure it so it doesn’t whip about in the wind.
Use cable clips or weather resistant cable ties to secure the cable. Place clips or
ties approximately every 3 to 5 feet (1
to 1.6 m). Do not use metal staples or a
staple gun to secure cables. Metal staples—especially when installed with a
staple gun—have a tendency to cut the cables.
Extending Cable Runs
If the cable length supplied with the rain collector is not long enough for your
purposes, you may extend it. The maximum length of cable is 900 feet (270 m).
Note that this length represents the total length from the rain collector to the con-
sole, including any length of cable from the junction box to the console. To
extend the cable, purchase standard 4-Conductor Extension Cables from Davis
and connect them to the existing rain collector cable.
Adjusting the Rain Collector II
The Rain Collector II is calibrated at the factory so
the bucket tips (and records rainfall) for each 0.01"
(or 0.2 mm if the metric adapter has been fitted) of
rain. To adjust the calibration slightly, use a 3/16" (or
5 mm) wrench to rotate the adjustment screws which
are located underneath the bucket (see “Rain Collec-
tor Internal Components” on page
2). The adjust-
ment guide embossed in the platform shows how far
you must rotate both screws in turn to effect a 1%
and a 2% change. Moving the screws in the positive
(+) direction causes the bucket to tip more times (i.e.
give a larger count) for a given amount of water.
Adjustment Guide
Note: Modify both adjustment screws by the same amount.
To check the accuracy of the rain collector, compare the Davis Rain Collector
with a tube type rain gauge. Use a rain gauge with an aperture of at least 4
inches. Any smaller and the readings obtained may not be accurate. Place the
tube type rain gauge directly next to the Davis rain collector. Compare the totals
on three storms. Based on this, develop an average for how far off the reading
are. Adjust the screws to fine tune the reading for the next three storms if neces-
sary.
Note: Do not compare rainfall readings to reading obtained from television, radio, newspapers, or neighbors
readings. Such readings are not located in your specific environment and therefore are not an accurate
measurement of the weather readings taking place in your surroundings. The rain collector is carefully
tested at the factory to conform to the specifications listed in the back of this manual.