Rain Master Weather Center II, Руководство пользователя

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Rain Master Irrigation Systems Weather Center II User Manual
Page 33
5.0 Rain Fall Sensor
5.1 At the Evolution DX2 Controller
Note: Rain Fall sensor management can only be
performed through the use of the Evolution
Central Computer.
5.1.1 Features and Benefits
The RMIS Rain Fall sensor provides accurate rainfall measurements (to
the nearest 0.01 inch) and storage of rainfall data. Because the sensor
interfaces directly to any Evolution DX2 Controller, the user can select
the most appropriate rainfall data collection location.
The Rain Fall sensor provides the following system benefits:
•
Automatic rain condition system shutdown
•
Calculation of root zone moisture depletion
•
Rainfall data reports
5.1.2 Rain Fall Sensor Theory of Operation
The Rain Fall sensor is an internal component comprised of two
reservoirs configured on a balanced seesaw type mechanism. As rainfall
enters the outer collecting funnel-shaped container, one of the two
reservoirs will fill up to a capacity of 0.01 inch of water. When the water
level reaches the 0.01 inch capacity, the weight of the water causes the
mechanism to flip to one side and the water is emptied out, placing the
remaining reservoir in position to collect new water. When the second
reservoir reaches the 0.01 inch capacity, the mechanism flips back to the
original position, exposing the first reservoir. All discarded water drains
out the bottom of the outer housing. This process continues throughout
the rainfall period.
Whenever the tipping bucket mechanism flips to one side or the other, an
electrical pulse is generated by means of an inverted pendulum action
and fed directly to the sensor terminal board (Input 3). The incoming
pulse is collected to produce a reading of 0.01 inch (1/ 100th of an inch)
at the controller display screen.