Product specifications

DS7852 (Rev. E, 1/4/07)
4-3
Perception and Wizard Sensors
7852
Rain Collector
0.01" or 0.2 mm Increments
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.
The rain collector comes with an optional metric adapter for converting the rain collector to take 0.2 mm rain
measurements for every tip of the bucket. The rain collector comes 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 140 MPH (224 kph).
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)
Collection Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33.2 in
2
(214 cm
2
)
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 lbs. 3 oz. (1 kg)
Console Data
Note: (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)
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)