Datasheet

3
Vantage Pro2
™
Equation Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Smithsonian Meteorological Tables
Equation Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.01" Hg (±0.3 mm Hg, ±0.3 hPa/mb)
Elevation Accuracy Required . . . . . . . . . . . . . . . . . . . . . ±10’ (3m) to meet equation accuracy specification
Overall Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.03" Hg (±0.8 mm Hg, ±1.0 hPa/mb)
Trend (change in 3 hours). . . . . . . . . . . . . . . . . . . . . . . . Change 0.06" (2 hPa/mb, 1.5 mm Hg) = Rapidly
Change 0.02" (.7hPa/mb, .5 mm Hg)= Slowly
Trend Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 position arrow: Rising (rapidly or slowly), Steady, or Falling (rapidly or slowly)
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 minute or when console BAR key is pressed twice
Current Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant
Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant, 15-min., and Hourly Reading; Daily, Monthly, High and Low
Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-min. and Hourly Reading; Daily, Monthly Highs and Lows
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Current Trend for Storm Clearing (Rising Trend
Low Threshold from Current Trend for Storm Warning (Falling Trend)
Range for Rising and Falling Trend Alarms . . . . . . . . . . . 0.01 to 0.25" Hg (0.1 to 6.4 mm Hg, 0.1 to 8.5 hPa/mb )
Clock
Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 minute
Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Time: 12 or 24 hour format (user-selectable)
Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . US or International format (user-selectable)
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±8 seconds/month
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Time: Automatic Daylight Savings Time (for users in North America and Europe
that observe it in AUTO mode, MANUAL setting available for all other areas)
Date: Automatic Leap Year
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Once per day at set time when active
Dewpoint (calculated)
Resolution and Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1°F or 1°C (user-selectable) °C is converted from °F rounded to the nearest 1°C
Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -105° to +130°F (-76° to +54°C)
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±3°F (±1.5°C) (typical)
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 to 12 seconds
Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . World Meteorological Organization (WMO)
Equation Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . WMO Equation with respect to saturation of moist air over water
Variables Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Outside Temperature and Instant Outside Relative Humidity
Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Calculation
Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Calculation; Daily, Monthly High and Low
Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Calculations; Daily, Monthly Highs and Lows
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Threshold from Instant Calculation
Evapotranspiration (calculated, requires solar radiation sensor)
Resolution and Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01" or 0.1 mm (user-selectable)
Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Daily to 32.67" (832.1 mm); Monthly & Yearly to 199.99" (1999.9 mm)
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Greater of 0.01" (0.25 mm) or ±5%, Reference: side-by-side comparison against a
CIMIS ET weather station
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 hour
Calculation and Source . . . . . . . . . . . . . . . . . . . . . . . . . . Modified Penman Equation as implemented by CIMIS (California Irrigation
Management Information System) including Net Radiation calculation
Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Latest Hourly Total Calculation
Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Latest Hourly Total Calculation, Daily, Monthly, Yearly Total
Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly, Daily, Monthly, Yearly Totals
Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Latest Daily Total Calculation