Datenblatt DAVIS-GroWeather
GROWEATHER, STANDARD
WEATHER STATION
Davis Instruments
The GroWeather® station comprises two basic components: a read-out console which performs analog to digital conversions, calculations, and data display; and a sensor interface module (SIM to which all external sensor cables are connected.  Another cable (provided) connects the sensor interface module and read-out console.  A DC-power adapter is also included.  Together with the GroWeatherLink® datalogger and software enables evapotranspiration calculation, data collection and communication with a computer.  Various configurations are available, see below for selection information. 

SPECIFICATIONS

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GENERAL
Operating Temperature........................ -5° to +140° F (20° to +60° C)
Supply Power (adapter included).............. 16mA (typical) at +10 to +16V 
100mA when display is illuminated
Connectors................................... Modular (RJ11, RJ12, RJ45, handset)
Recommended Maximum Cable Length............. 125ft (37m), SIM to read-out console
Housing Material............................. Black ABS plastic
Display Type................................. Liquid Crystal, black characters and graphics on grey background
Dimensions
  Console.................................... 5.25 x 5.4 x 3.0 in (133 x 137 x 76 mm)
  SIM........................................ 5.72 x 5.85 x 1.25 in (145 x 149 x 32 mm)
  LCD Display................................ 4.4 x 1.9 in (112 x 48 mm)

SENSOR INPUTS 

RF Filtering................................. RC or LC low-pass filter on each signal line
Surge Protection............................. Micro-gap absorbers, 200NT±40V,500 A 
(8x20 usec)

CONSOLE DISPLAYS 

General
   Sensor sample rate........................ Once per 2.5 seconds
   Time of min & max sensor values........... Stored with value
   Date of min & max sensor values........... Stored with value
   Clear min & max sensor values (start over) Accomplished by user manually
EvapoTranspiration (requires External Temperature-Humidity Sensor, Anemometer, & Solar Radiation Sensor)
   Calculation Interval...................... Once per hour, using values averaged over one hour
   Resolution & units........................ 0.01 in or 0.2 mm (user selectable)
   Daily ETo Range........................... 99.99 in, 999.8 mm
   Total ETo Range........................... 1,999.9 in, 19,999 mm
   Accuracy.................................. ±10% calculated & displayed in console(±5% calculated & displayed by GroWeatherLink software)
   Functions................................. Daily ETo Sum (alarm, autoclear) Total ETo for period (alarm), Average ETo per day over period (ETo values for multiple crops calculated and displayed by GroWeatherLink software)
Growing-Degree Days (Heat Units) (requires External Temperature-Humidity Sensor, Stainless Steel Temperature probe, or Temperature Sensor)
   Calculation............................... Real-time summation
Integration interval = 1 minute
(Values based on mean daily temperature are also calculated and displayed by GroWeatherLink software)
   Threshold/Limits.......................... Base threshold and upper limit are user selectable
   Daily & Average Degree-Day Resolution 
     & Units.................................		 ±1° F or 1° C (user selectable)
   Daily & Average Degree-Day Range.......... 99.9°
   Total Degree-Days Range................... 19,999°
   Functions (period is selected by user).... Daily Degree-Days Sum (auto clear)
Total Degree-Days for period (alarm)
Average Degree-Days per day over period
Air Temperature (Outside Temperature) (requires External Temperature-Humidity Sensor, Stainless Steel Temperature Probe, or Temperature Probe)
   Resolution & units........................  0.1° F or 0.1° C (user selectable)
   Range.....................................  -50° to +140° F, -73°  to +60° C
   Accuracy..................................  ±1° F, ±0.5° C
   Functions................................. Current Temperature (high & low alarms)
Maximum & Minimum Temperature (auto clear)
Temperature 2 (Soil Temperature) (requires Stainless Steel Temperature Probe or Temperature Probe)
   Resolution & units........................  0.1° F or 0.1° C (user selectable)
   Range.....................................  -50° to +140° F, -73°  to +60° C
   Accuracy..................................  ±1° F, ±0.5° C
   Functions................................. Current Temperature (high & low alarms)
Maximum & Minimum Temperature (auto clear)
Inside Temperature (sensor located in console)
   Resolution & units........................ 0.1° F or 0.1° C (user selectable)
   Range..................................... +32° to +140° F,0°  to +60° C
   Accuracy.................................. ±1° F, ±0.5° C
   Functions................................. Current Temperature (high & low alarms)
Maximum & Minimum Temperature (manual reset)
Temperature-Humidity Index (THI) (requires External Temperature-Humidity Sensor)
   Resolution & units........................ 0.1° F or 0.1° C (user selectable)
   Range..................................... +61° to +125° F,16°  to +52°C
   Accuracy.................................. ±2° F, ±1° C
   Functions................................. Current Temperature-Humidity Index (alarm)
Maximum Temperature-Humidity Index (auto clear
Wind Speed (requires Anemometer)
   Resolution & units........................ 1 mph, 1km/hr, 0.1m/sec, or 1 knot
(user selectable)
   Range..................................... 2 to 175 mph, 4 to 280 km/hr,
0.9 to 78 m/sec, 2 to 152 knots
   Accuracy.................................. ±5%
   Functions................................. Current Speed (alarm), Maximum Speed (manual reset)
Wind Run (requires Anemometer)
   Resolution & units........................ 0.1 mph or 0.1 km/hr (user selectable)
   Range..................................... 0 to 1,999.9 miles, 0 to 1,999.9 km
   Accuracy.................................. ±5%
   Functions (period is user selectable)..... Daily Wind Run Sum (auto clear)
Average Wind Run per day over period
Wind Direction (requires Anemometer)
   Resolution................................ 16 points (22.5°) on compass rose,
1° in digital display
   Accuracy.................................. ±7°
Wind Chill (requires Anemometer)
   Resolution & units........................ 0.1° F or 0.1° C (user selectable)
   Range..................................... -134° to +98° F, 92° to +37° C
   Accuracy.................................. ±4° F, ±2° C
   Functions................................. Current Wind Chill (low alarm),
Minimum Wind Chill (manual reset)
Solar Irradiance (requires Solar Radiation Sensor)
   Resolution & Units........................ 1 Watt/m²
   Range..................................... 0 to 1,800 Watts/m²
   Accuracy.................................. ±5% at normal incidence
   Cosine Response .......................... ±3% for angle or incidence = 0 to 75 °
   Temperature Coefficient................... -0.034% per °F (-0.063% per °C); reference temperature = 72 °F (22 °C)
   Functions................................. Current Intensity
Solar Energy (requires Solar Radiation Sensor)
   Resolution & Units........................ 0.1 Langley (Joules/m² displayed by GroWeatherLink software)
   Range..................................... 0 to 1,999.9 Langleys
   Accuracy.................................. ±6%
   Temperature Coefficient................... -0.034% per °F (-0.063% per °C); reference temperature = 72 °F (22 °C)
   Functions................................. Daily Energy Sum (auto clear)
Average Energy per day over period
Rainfall (requires Rain Collector)
   Resolution & units........................ 0.01 in or 0.2 mm (user selectable)
   Daily Rainfall range...................... 0 to 40.95 in, 0 to 819 mm
   Total Rainfall range...................... 0 to 99.99 in, 0 to 9999 mm
   Rate of Rainfall range.................... 0 to 72 in per hour, 0 to 999 mm per hour
   Rainfall Accuracy......................... ±(2% + 1 count) for rates 0.01 to 2 in
(0.2 to 50 mm) per hour, (3% + 1 count) for rates 2 to 4 in
(50 to 100 mm) per hour
   Rate of Rainfall Accuracy................. ±5%
   Functions................................. Daily amount (alarm, auto clear)
Total amount for period (manual reset)
Current Rate of Rainfall
Maximum Rate of Rainfall (auto clear)
Barometric Pressure (sensor located in console)
   Resolution & units........................ 0.01 in of Hg, 0.1 mm of Hg, or 0.1 hPa
(user selectable)
   Range..................................... 26 to 32 in, 660 to 810 mm, 880 to 1080 hPa
   Accuracy.................................. ±0.05 in Hg, ±1.3 mm Hg, ±1.7 hPa
(at room temperature)
   Trend (change in 1 hour).................. ±0.2 in/hr, ±5 mm/hr, ±0.7 hPa
   Functions................................. Current Barometric Pressure
3-position trend arrow: up, down, even
Stored Barometric Pressure Reading
Relative Humidity (requires External Temperature-Humidity Sensor)
   Range..................................... 10% to 90%
   Accuracy.................................. ±5%
   Functions................................. Current Relative Humidity (high & low alarms)
Dewpoint (requires External Temperature-Humidity Sensor)
   Resolution & units........................ 0.1° F or 0.1° C (user selectable)
   Range..................................... -99° to +140° F, -73° to +60° C
   Accuracy.................................. 4° F, 2° C 
   Functions................................. Current Dewpoint (alarm)
Leaf Wetness (requires Leaf Wetness Sensor)
   Resolution................................ 1
   Range..................................... 0 to 15
   Dry/Wet Threshold......................... User selectable
   Functions................................. Current Leaf Wetness
(Leat-wet hours calculated and displayed by GroWeatherLink software)
Time
   Accuracy.................................. ±15 sec/month
   Functions................................. Current time (alarm)(12 or 24 hour format),
date & year