Product specifications

1-6
Vantage Pro2
™
Outside Temperature (sensor located in ISS)
Resolution and Units. . . . . . . . . . . . . . . . . . . . . . . . . Current Data: 0.1°F or 1°F or 0.1°C or 1°C.°(nominal). Celsius is
converted from Fahrenheit and rounded to the nearest 0.1° or 1°C.
Historical Graph Data and Alarms: 1°F or 1°C. Celsius is converted
from Fahrenheit and rounded to the nearest 1°C
Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40° to +150°F (-40° to +65°C)
Sensor Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1°F (±0.5°C) typical (see Fig. 1)
Radiation Induced Error . . . . . . . . . . . . . . . . . . . . . . +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)
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 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 and Monthly Highs and Lows
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Thresholds from Instant Reading
Temperature Humidity Sun Wind Index (requires Solar Radiation Sensor)
Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . .1°F or 1°C. Celsius is converted from Fahrenheit and rounded to the
nearest 1°C.
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -90° to +135°F (-68° to +64°C)
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±4°F (±2°C) (typical)
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 seconds
Sources and Formulation Used . . . . . . . . . . . . . . . . . . . . United States National Weather Service (NWS)/NOAA
Steadman (1979) modified by US NWS/NOAA and Davis Instruments
to increase range of use
Variables Used. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Outside Temperature, Instant Outside Relative Humidity, 10-
minute Average Wind Speed, 10-minute Average Solar Radiation
Formulation Description . . . . . . . . . . . . . . . . . . . . . . . . . . Uses Heat Index as base temperature. Effects of wind and solar
radiation are either added or subtracted from this base to give an
overall effective temperature
Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant
Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant and Hourly Calculation; Daily, Monthly Highs
Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Calculation; Daily, Monthly Highs
Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Instant Reading
Ultra Violet (UV) Radiation Dose (requires UV Sensor)
Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1 MEDs to 19.9 MEDs; 1 MED above 19.9 MEDS
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 199 MEDs
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5% of daily total
Drift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .up to ±2% per year
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 seconds to 1 minute (5 minutes when dark)
Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Latest Daily Total (user resettable at any time from Current Screen)
Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . .Hourly, Daily Totals (user reset from Current Screen does not affect
these values)
Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Daily Total
Alarm Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 19.9 MEDs
Ultra Violet (UV) RadIatIon Index (requires UV Sensor)
Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1 Index
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 16 Index
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5% of full scale (Reference: Yankee UVB-1 at UV Index of 10
(extremely high))
Cosine Response. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±4% (0° to 65° incident angle); 9% (65° to 85° incident angle)
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 seconds (5 minutes when dark)
Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant
Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant and Hourly Average; Daily, Monthly High
Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Average, Daily, Monthly Highs
Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Instant Calculation