R AIN C OLLECTOR , 0.01" (or 0.
2 mm) Increments, Standard 7852(M)
SENSORS
The Rain Collector is designed to meet the guidelines of the World Meteorological Organization. Rain enters the
collector cone, passes through a debris-filtering screen, and collects in one chamber of the tipping bucket. The
bucket tips when it has collected an amount of water equal to the increment in which the collector measures
(0.01" or 0.2 mm). As the bucket tips, it causes a switch closure and brings the second tipping
bucket chamber into position. The rain water drains out through the screened drains in the
base of the collector.
The collector is designed for years of accurate, trouble-free service. The body and base of
the collector are constructed of tough, UV resistant plastic; the tipping bucket pivots on
bearings that minimize friction and wear. Stainless steel adjustment screws under each
chamber of the tipping bucket allow you to fine-tune the calibration of the Rain Collector.
Two types of collector are available; one measures in 0.01” increments and the other in
0.2 mm increments. Both rain collectors come with mounting holes pre-drilled in the base and
a built-in leveling trough to aid you in installing the rain collector. The Rain Collector Heater is available for use with
either of the Rain Collector units. This heater allows the Rain Collector to measure the moisture content
of snowfall and protects the internal components from freezing rain. If mounted according
to instructions, the Rain Collector is wind tunnel tested to be stable in winds up to 140MPH
(224 Km/Hr).
SPECIFICATIONS
General
Sensor Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tipping bucket with magnetic reed switch
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Contact closure
Attached Cable Length. . . . . . . . . . . . . . . . . . . . . . . . . . 40’ (12 m)
Cable Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-conductor, 26 AWG
Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Modular connector (RJ-11)
Recommended Maximum Cable Length . . . . . . . . . . . . . 900’ (270 m)
Housing Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UV-stabilized ABS plastic
Dimensions
Rain Collector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.75" diameter x 9.5" high (16.5 cm diameter x 24 cm high)
2 2
Collection Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 in (200 cm )
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 lbs. 3 oz. (1 kg)
Console Data (These specifications apply to sensor output as converted by Davis Instruments weather station consoles.)
Weather Monitor/Wizard Range
Daily Rainfall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.00” to 99.99” (0.0 mm to 999.8 mm)
Total Rainfall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.00” to 99.99” (0.0 mm to 9999 mm)
GroWeather/EnviroMonitor Range
Daily Rainfall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.00” to 40.95” (0.0 mm to 819 mm)
Total Rainfall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.00” to 99.99” (0.0 mm to 9999 mm)
Rate of Rainfall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.00” to 72.0” per hour (0 to 999 mm per hour)
Accuracy
Rainfall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±4%, ±1 rainfall count between 0.01" and 2.00" per hour (0.2 mm and
50.0 mm per hour); ±5%, ±1 rainfall count between 2.00" and 4.00" per hour
(50.0 mm and 100.0 mm per hour)
Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01” (0.2 mm)
Sample and Display Update Interval . . . . . . . . . . . . . . . 16 seconds (max)
WeatherLink¨ Data (These specifications apply to sensor output as logged and displayed by the WeatherLink.)
Daily Rainfall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Total during archive interval
Total Rainfall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Total during archive interval
Rate of Rainfall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maximum value during archive interval (GroWeatherLink, Energy WeatherLink,
and Health WeatherLink)
Input/Output Connections
Black & Red . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Switch terminal
Green & Yellow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Switch terminal
3465 Diablo Ave., Hayward, CA 94545-2778
( 510 ) 732-9229 • FAX ( 510 ) 732-9188 • sales@davisnet.com • www.davisnet.com
DS7852-00 (Rev. B, 7/14/99)
2 , 7852(M) Rain Collector, 0.01" (or 0.2 mm) Increments, Standard
SENSORS
INSTALLATION OPTIONS
