DAVIS Vantage Pro2 ISS User Manual Page 6
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- Table of contents
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6
Wireless Vantage Pro2
™
Historical Graph Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Readings; Daily and Monthly Highs and Lows
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Thresholds from Instant Reading
Solar Radiation (requires solar radiation sensor)
Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 W/m
2
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 1800 W/m
2
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5% of full scale (Reference: Eppley PSP at 1000 W/m
2
)
Drift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .up to ±2% per year
Cosine Response. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±3% for angle of incidence from 0° to 75°
Temperature Coefficient. . . . . . . . . . . . . . . . . . . . . . . . . . -0.067% per °F (-0.12% per °C); reference temperature = 77°F (25 °C)
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 seconds to 1 minute (5 minutes when dark)
Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Reading and Hourly Average; Daily, Monthly High
Historical Graph Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Average, Daily, Monthly Highs
Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Instant Reading
Sunrise and Sunset
Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 minute
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1 minute
Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . United States Naval Observatory
Temperature
Inside Temperature (sensor located in console)
Resolution and Units. . . . . . . . . . . . . . . . . . . . . . . . . Current Data: 0.1°F or 1°F or 0.1°C or 1°C (user-selectable) °C is converted from
°F rounded to the nearest 1°C
Historical Data and Alarms: 1°F or 1°C (user-selectable)
Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +32° to +140°F (0° to +60°C)
Sensor Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1°F (±0.5°C), (see Fig. 1)
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 minute
Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . Instant (user-adjustable offset available)
Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . Instant Reading; Daily and Monthly High and Low
Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . Hourly Readings; Daily and Monthly Highs and Lows
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Thresholds from Instant Reading
Outside Temperature (sensor located in ISS)
Resolution and Units. . . . . . . . . . . . . . . . . . . . . . . . . Current Data: 0.1°F or 1°F or 0.1°C or 1°C (user-selectable) nominal
°C is converted from °F rounded to the nearest 1°C Historical Data and Alarms: 1°F
or 1°C (user-selectable)
Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40° to +150°F (-40° to +65°C)
Sensor Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1°F (±0.5°C) above 20°F (-7°C), ±2°F (±1°C) under 20°F (-7°C) (see Fig. 1)
Radiation Induced Error (Passive Shield) . . . . . . . . .+4°F (2°C) at solar noon (insolation = 1040 W/m
2
, avg. wind speed 2 mph (1 m/
s)) (reference: RM Young Model 43408 Fan-Aspirated Radiation Shield)
Radiation Induced Error (Fan-Aspirated Shield) . . . . +0.6°F (0.3°C) at solar noon (insolation = 1040 W/m
2
, avg. wind speed 2 mph
(1 m/s)) (reference: RM Young Model 43408 Fan-Aspirated Radiation Shield)
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 to 12 seconds
Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . Instant (user-adjustable offset available)
Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . Instant Reading; Daily, Monthly, Yearly High and Low
Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . Hourly Readings; Daily, Monthly, Yearly Highs and Lows
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Thresholds from Instant Reading
Extra Temperature Sensors or Probes
Resolution and Units. . . . . . . . . . . . . . . . . . . . . . . . . Current Data: 1°F or 1°C (user-selectable) °C is converted from °F rounded to the
nearest 1°C
Historical Data and Alarms: 1°F or 1°C (user-selectable)
Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40° to +150°F (-40° to +65°C)
Sensor Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1°F (±0.5°C) above 20°F (-7°C), ±2°F (±1°C) under 20°F (-7°C) (see Fig. 1)
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 to 12 seconds (77 to 90 seconds for Leaf Wetness/Temperature and Soil
Moisture/Temperature Stations)
Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . Instant Reading (user-adjustable offset available)
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Thresholds from Instant Reading
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