Each weather station is completely pre-wired, and assembled at the
factory, including software to run the data logger and sensors. Each station includes software for weather data retrieval, and software for
computing Lascano-Van Bavel Evapotranspiration (ETP) in mm/hr, with daily water use. Crop growth models and Crop Water Index are
developed with this information for grower applications of irrigation, pest control, and performing the optimum harvest. Many other crop
manager decisions can benefit from the hourly weather records, and current information.
Evapotranspiration Software - PENV
Standard evapotranspiration modeling software is packaged with the Dynamet weather station. The purpose is to compute the potential
evapotranspiration from short grass (ETo) in mm per hour on an hourly basis. A daily total in mm is also computed. ETo calculations
are based on the most advanced solution prepared by the Texas A&M University research staff to enhance the accuracy of prior ET
calculations, (Lascano, van Bavel - ASA 2006).
| Features
- Portable 2 meter (6 ft.) tripod, 3 meter (10 ft.) optional
- Sealed enclosure
- CR1000 data logger
- 10 Watt solar panel, mast mounted
- Battery and charger circuit
- Scientific grade weather sensors
- 100,000 data values in recorded data memory
- RS-232 Interface and PC9-pin cable (3m)
- Power Up Program Start
- Windows setup communications and retrieval
- Lascano-Van Bavel Evapotranspiration
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Specifications
Wind Speed
Sensor 3 - cup anemometer; outputs AC voltage,
1 count/revolution
Operating temperature range -58 to +122° F (-50 to +50° C)
Operation range 0 - 112 mph (50 m/s), gust survival 134 mph (60 m/s)
Threshold 1.1 mph (0.5 m/s)
Distance constant (63% recovery) 7.5 ft (2.3 m)
Accuracy ±1.1 mph (0.5 m/s) over range 0 - 45 mph (0 - 20 m/s), 2.2 mph (1.0 m/s) over
range 45 - 112 mph (20-50 m/s)
Wind Direction
Sensor Wind vane fitted with 10K potentiometer
Operating temperature range -58 to +122° F (-50 to +50° C)
Threshold 1.8 mph (0.8 m/s) at 10° displacement, ~4.0 mph (1.8 m/s) at 5° displacement
Recovery 1.6 ft (0.5 m)
Accuracy ±5°
Solar Radiation
Sensor Silicon photocell Sensitivity: Typically 80 uA / 10° W / m2
Accuracy ±3% typical
Air Temperature and Soil Temperature Probes Sensor Thermistor
Range +14 to +122° F (-10 to +50° C)
Accuracy ±0.45° F (0.25° C)
Rain Gage
Sensor Magnetic switch
Orifice 6.04” diameter (15.34 cm)
Sensitivity 1 tip per 0.01” (0.25 mm)
Relative Humidity
Sensor Polymer film surface (Vaisala)
RH range 0 - 100% RH
RH accuracy at 68° F (20° C) ±2% RH at 0 - 90% RH; ±3% RH at 90 - 100% RH
Operation stability ±3% RH/year
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