RainMaster ET Tracker, Руководство пользователя

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Rain Master Irrigation Systems Weather Station Manual
Page 19
through the evaporating plate surface, more water is drawn through the electronic pulse
monitor, located on the electronics board, where it is measured at the rate of one pulse
for every 0.01” of ET. A miniature motor, also located on the electronics board
assembly, supplies the water pressure necessary to keep the ceramic cup filled. The
motor is also used to purge the water lines of air bubbles when priming the system.
3.1.3 ET Tracker Specifications
The ET Tracker is capable of measuring the evapotranspiration for any given
microclimate. It produces a single pulse for every 0.01” of ET and is capable of
communicating the occurance of the pulse to the Rain Master Evolution DX2 controller
equipped with the necessary sensor board (DX-FLOW or DX-MOIST).
Sensor Accuracy: +/-1% of evapotranspiration.
Sensor Resolution: 0.01” reference Evapotranspiration ( ET).
Sensor Output: A single pulse per 0.01” ET.
Capacity: Reservoir contains 12 inches of distilled water per ET
filling.
Installation:
Connects directly into a Rain Master Evolution DX2
controller equipped with a sensor board. The ET is read
directly from the Evolution DX2 controller by the Evolution
Central Computer.
Dimensions:
34.5 inches high x 3.1 inches in diameter
Weight:
3.5 pounds empty, 7.85 pounds filled with water
Mounting:
Inside Weather Station tower
Materials: Ceramic evaporating plate, green canvas cover, PVC
Plastic housing
Electrical
Signal:
Electrical signal is pulsed low for 2.3 (+/- .07) seconds
after each 0.01” ET pulse.
Impedance:
Normally open circuit of 53 OHMS during pulse. (Max
voltage from receiving equipment: 30V DC)
Transient Protection: Full lightning protected, except direct strikes to the unit.
Power Source Internal
Backup Supply: Four (4) alkaline “AA” cells (6 Volts DC).
External Supply
Connection:
5 to 16V DC, 0.1 A peak 0.4 MA average. Internal screw
terminal block.
Freeze Protection:
Unit must be drained during freezing season.