6
Vantage Pro2
™
T e m p e r a t u r e
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 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)
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 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; 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
T e m p e r a t u r e H u m i d i t y S u n W i n d I n d e x ( r e q u i r e s s o l a r r a d i a t i o n s e n s o r )
Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1°F or 1°C (user-selectable) °C is converted from °F rounded to
nearest 1°C
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -90° to +165°F (-68° to +74°C)
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±4°F (±2°C) (typical)
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 to 12 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 and allow for cold weather 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, affects of wind and solar
radiation are either added or subtracted from this base to give an
overall effective temperature
Current Graph Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant and Hourly Calculation; Daily, Monthly High
Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Calculation; Daily, Monthly Highs
Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Instant Reading
U l t r a V i o l e t ( U V ) R a d i a t i o n D o s e ( r e q u i r e s U V s e n s o r )
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 resetable at any time from Current Screen)
Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly, Daily Totals (user reset from Current Screen does not affect
these values)