DAVIS Rain Collector II for GroWeather, EnviroMonitor, Weather Monitor and Wizard - Manual (Page 10)

Calibration of Older Model Weather Stations
10
To Clear Rainfall
Rain and total rain are independent of each other. You must clear each register
separately.
1. Press RAIN once or twice to select rain or total rain, as desired.
2. Press CLEAR and hold it down.
The display will flash several times and then the weather station clears rainfall.
Daily Rainfall Cleared
Note: Performing a “total clear” on the weather station does not clear rainfall.
To Set Total Rainfall
You may enter a total rainfall amount to represent any rainfall which accumu-
lated before you obtained the Rain Collector II:
1. Press RAIN once or twice to select total rainfall.
2. Use ENTER to set the total rainfall amount. See “Using the Enter Key” in the
weather station manual.
Calibration of Older Model Weather Stations
This information applies only to users of the Weather Wizard II-S, Weather
Wizard III, and Weather Monitor II manufactured prior to April, 1993. To check if
your station meets this criterion, press the RAIN button on the console. If, when
set to inches, the display reads 0.0 (rather than 0.00), you have an older model
station.
Standard Setting
When using the 0.01” setting of the Rain Collector II with an older model station,
note that the station is pre-calibrated for an earlier model 0.1" rain collector. To
re-calibrate your station, first set the display to inches, then change CAL to 0100.
(See “Rainfall Calibration Number” on page
4 and/or your station user’s manual
for instructions on how to change CAL.) Be aware that the console will revert to
its default calibration (i.e., 0.1") if it loses power.
Metric Setting
When using the 0.2 mm setting of the Rain Collector II with an older model sta-
tion, note that the station stores rainfall amounts in 0.2 mm increments but dis-
plays amounts rounded to the nearest whole millimeter.
Note: Keep in mind when testing the rain collector with older weather stations that the display adds 1 mm for
each 5 tips of the bucket. Because the display rounds, however, the first change occurs after the bucket
tips 3 times (0.6 mm rounded to 1 mm).