West Juneau Weather Station Vantage Pro Specifications

(510) 732-9229 • FAX (510) 670-0589 • sales@davisnet.com • www.davisnet.com

3465 Diablo Ave., Hayward, CA 94545-2778

6150 - 3270 Nowell - 6150 Model, Rev. A

6160

6151

6161

VANTAGE PRO

CHILL

WIND

RAIN RATE

in/hr

TEMP OUT

HUM IN

HUM OUT

DAILY RAIN

TEMP IN

inmb

BAROMETER

STATION NO.1

MPH

Last 24hrs

Every 1

Wireless Vantage Pro(r) & Vantage Pro Plus(tm) Stations

Including Fan-Aspirated Models

The Vantage Pro (6150, 6151) and Vantage Pro Plus (6160, 6161) Wireless Weather

Stations include two components: the Integrated Sensor Suite (ISS) which houses

and manages the external sensor array; and the console which provides the user interface,

data display, A/D conversion, and calculations. The ISS and Vantage Pro console communicate via an FCCcertified,

license-free transmitter and receiver. User-selectable DavisTalk ID codes allow up to eight stations to coexist

in the same geographic area. The Wireless Vantage Pro Plus Weather Station includes two additional sensors that are

optional on the Vantage Pro: the UV Sensor and the Solar Radiation Sensor. The console may be powered by batteries

or by the included AC-power adapter. The wireless ISS is solar powered with a battery backup. Use WeatherLInk for

Vantage Pro to interface your weather station with a computer, to log weather data, and to upload weather information

to the internet.

The 6150 and 6160 rely on passive shielding to reduce solar-radiation induced temperature errors in the outside temperature

sensor readings. The Fan-aspirated 6151 and 6161 combine passive shielding with a solar-powered fan that

draws outside air in over the temperature and humidity sensors, providing a much more accurate temperature reading

than that available using passive shielding alone.

Specifications

Console

Console Operating Temperature. . . . . . . . . . . . . . . . . . . . . . . . +14° to +140°F (-10° to +60°C)

Display Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +32° to +140°F (0° to +60°C)

Non-operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . -5° to +158°F (-20° to +70°C)

Current Draw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.67 mA average, 15 mA peak, (plus 80 mA for display lamps, plus .125 mA for

each optional wireless transmitter received by the console) at 4 to 6 VDC

AC Power Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 VDC, 200 mA, regulated

Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 C-cells

Battery Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . up to 1 year

Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Modular RJ-11

Housing Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UV-resistant ABS plastic

Console Display Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LCD Transflective

Dimensions

Console with antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.375" x 6.125" x 1.5" (264 mm x 156 mm x 38 mm)

Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.94" x 3.375" (151 mm x 86 mm)

Weight (with batteries) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.88 lbs. (.85 kg)

Integrated Sensor Suite (ISS)

Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40° to +150°F (-40° to +65°C)

Non-operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . -50° to +158°F (-45° to +70°C)

Current Draw (ISS SIM only) . . . . . . . . . . . . . . . . . . . . . . . . . . 0.07 mA (average), 10 mA (peak) at 4 to 6 VDC

Solar Power Panel (ISS SIM / Fan). . . . . . . . . . . . . . . . . . . . . . 0.5 watts / .75 watts

Battery (ISS SIM / Fan (Fan-Aspirated)) . . . . . . . . . . . . . . . . . . CR-123 3-Volt Lithium cell / 2 - 1.2 Volt NiCad C-cells

Battery Life (3-Volt Lithium cell) . . . . . . . . . . . . . . . . . . . . . . . . up to 2 years, 1 year with no sun

Battery Life (NiCad C-cells) . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 year

Fan Aspiration Rate (Fan-Aspirated) . . . . . . . . . . . . . . . . . . . . 190 feet/min. (0.9 m/s) (full sun), 80 feet/min. (0.4 m/s) (battery only)

Connectors, Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Modular RJ-11

Cable Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-conductor, 26 AWG

Cable Length, anemometer . . . . . . . . . . . . . . . . . . . . . . . . . . . 40' (12 m) (included) 540' (165 m) (maximum recommended)

Wind Speed Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wind cups with magnetic switch

Wind Direction Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wind vane with potentiometer

Rain Collector Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tip bucket, 0.01" per tip, 33.2 in2 (214 cm2) collection area

Temperature Sensor Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . Platinum wire thermistor

Relative Humidity Sensor Type. . . . . . . . . . . . . . . . . . . . . . . . . Film capacitor element

Housing Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UV-resistant ABS plastic

Dimensions

6150, 6160 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.0" x 9.375" x 14.0" (279 mm x 238 mm x 356 mm)

6151, 6161 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.0" x 9.375" x 21.0" (279 mm x 238 mm x 533 mm)

Weight

6150, 6160 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.42 lbs. (2.17 kg) / 6.35 lbs. (2.88 kg)

6151, 6161 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.8 lbs. (2.62 kg) / 6.76 lbs. (3.06 kg)

Wireless Communications

Transmit/Receive Frequency . . . . . . . . . . . . . . . . . . . . . . . . . US Models: 916.5 MHz, Overseas Models: 868.35 MHz

DavisTalk‰ ID Codes Available . . . . . . . . . . . . . . . . . . . . . . 8

Output Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 916.5 MHz: FCC-certified low power, less than 1 mW, no license required

868.35 MHz: CE-certified, less than 10 mW, no license required

DS6150 (Rev. B, 3/13/2002)

Range

Line of Sight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . up to 400 feet (122 m)

Through Walls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 to 200 feet (30 to 60 m)

Sensor Inputs

RF Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RC low-pass filter on each signal line

Sensor Outputs (as displayed on console)

General

Historical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Includes the past 24 values listed unless otherwise noted; all can be cleared and all totals

reset

Daily Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Includes the earliest time of occurrence of highs and lows; period begins/ends at 12:00 am

Monthly Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Period begins/ends at 12:00 am on the first of the month

Yearly Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Period begins/ends at 12:00 am on the first of January unless otherwise noted

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Current data appears in the right most column in the console graph and represents the

latest value within the last period on the graph; totals can be set or reset

Graph Time Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 min., 10 min., 15 min., 1 hour, 1 day, 1 month, 1 year (user-selectable, availability

depends upon variable selected)

Graph Time Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Intervals + Current Interval (see Graph Intervals to determine time span)

Graph Variable Span (Vertical Scale) . . . . . . . . . . . . . . . . Automatic (varies depending upon data range); Maximum and Minimum value in range

appear in ticker

Alarm Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Alarms sound for only 2 minutes (time alarm is always 1 minute) if operating on battery

power. Alarm message is displayed in ticker as long as threshold is met or exceeded.

Alarms can be silenced (but not cleared) by pressing the DONE key.

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Varies with sensor - see individual sensor specs

Also varies with DavisTalk transmitter ID code - #1=shortest, #8=longest

Forecast

Variables Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Barometric Reading & Trend, Wind Speed & Direction, Rainfall, Temperature, Humidity,

Latitude & Longitude, Time of Year

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 hour

Display Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Icons on top center of display; detailed message in ticker at bottom

Variables Predicted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sky Condition, Precipitation, Temperature Changes, Wind Direction and Speed Changes

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 (see Fig. 1)

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) up to 110°F (43°C), ±2°F (±1°C) over 110°F (43°C) (see Fig. 2)

Radiation Induced Error (Passive Shield) . . . . . . . . . . . . . +4°F (2°C) at solar noon (insolation = 1040 W/m2, avg. wind speed = 2 mph (1 m/s))

(reference: RM Young Model 43408 Fan-Aspirated Radiation Shield)

Radiation Induced Error (Fan-Aspirated) . . . . . . . . . . . . . +0.6°F (0.3°C) at solar noon (insolation = 1040 W/m2, avg. wind speed = 2 mph (1 m/s))

(reference: RM Young Model 43408 Fan-Aspirated Radiation Shield)

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 to 12 seconds

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Reading (user adjustable); Daily, Monthly, Yearly High and Low

Historical 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1°F or 1°C (user-selectable)

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) up to 110°F (43°C), ±2°F (±1°C) over 110°F (43°C) (see Fig. 2)

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 to 12 seconds (40 to 48 seconds for Leaf Wetness/Temperature and Soil Moisture/

Temperature Stations)

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Reading (user adjustable)

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Thresholds from Instant Reading

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)

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) up to 110°F (43°C), ±2°F (±1°C) over 110°F (43°C)

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 minute

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Reading (user adjustable); Daily and Monthly High and Low

Historical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Readings; Daily and Monthly Highs and Lows

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Thresholds from Instant Reading

Wind Speed

Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 mph, 1 km/h, 0.1 m/s, or 1 knot (user-selectable)

Range (large wind cups) . . . . . . . . . . . . . . . . . . . . . . . . . 2 to 150 mph, 2 to 130 knots, 1 to 67 m/s, 3 to 241 km/h

Range (small wind cups) . . . . . . . . . . . . . . . . . . . . . . . . . 3 to 175 mph, 3 to 150 knots, 1.5 to 79 m/s, 5 to 282 km/h

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Reading: 2.5 to 3 seconds, 10-minute Average: 1 minute

Accuracy (large wind cups) . . . . . . . . . . . . . . . . . . . . . . . ±2 mph (2 kts, 3 km/h, 1 m/s) or ±5%, whichever is greater

Accuracy (small wind cups) . . . . . . . . . . . . . . . . . . . . . . . ±3 mph (3 kts, 5 km/h, 1.5 m/s) or ±5%, whichever is greater

Maximum Cable Length . . . . . . . . . . . . . . . . . . . . . . . . . . 540' (165 m)

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Reading; 10-minute and Hourly Average; Hourly High; Daily, Monthly and Yearly

High with Direction of High

Historical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-min. and Hourly Averages; Hourly Highs; Daily, Monthly and Yearly Highs with

Direction of Highs

Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Thresholds from Instant Reading and 10-minute Average

Wind Direction

Display Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 points (22.5°) on compass rose, 1° in numeric display

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±7°

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 to 3 seconds

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Reading (user adjustable); 10-min. Dominant; Hourly, Daily, Monthly Dominant

Historical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Past 6 10-min. Dominants on compass rose only; Hourly, Daily, Monthly Dominants

Wind Chill (Calculated)

Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1°F or 1°C (user-selectable)

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -110° to +130°F (-79° to +54°C)

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±2°F (±1°C) (typical)

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 to 12 seconds

Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . United States National Weather Service (NWS)/NOAA

Equation Used. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Osczevski (1995) (adopted by US NWS in 2001)

Variables Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Outside Temperature and 10-min. Avg. Wind Speed

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Calculation; Hourly, Daily and Monthly Low

Historical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly, Daily and Monthly Lows

Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low Threshold from Instant Calculation

Rainfall

Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01" or 0.25 mm (user-selectable) (1 mm at totals = 2000 mm)

Daily/Storm Rainfall Range . . . . . . . . . . . . . . . . . . . . . . . 0 to 99.99" (0 to 9999 mm)

Monthly/Yearly/Total Rainfall Range . . . . . . . . . . . . . . . . 0 to 199.99" (0 to 19999 mm)

Rain Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 199.99" (0 to 19999 mm)

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . For rain rates up to 2"/hr (50 mm/hr): ±4% of total or +0.01" (0.25 mm) (0.01" = one tip of

the bucket), whichever is greater

For rain rates from 2"/hr (50 mm/hr) to 4"/hr (100 mm/hr): ±5% of total or +0.01"

(0.25 mm) (0.01" = one tip of the bucket), whichever is greater

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 to 12 seconds

Storm Determination Method . . . . . . . . . . . . . . . . . . . . . . 0.02" (0.5 mm) begins a storm event, 24 hours without further accumlulation ends a storm

event

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Totals for Past 15-min, Past 24-hour, Daily, Monthly, Yearly (start date user-selectable)

and Storm (with begin date); Umbrella is displayed when 15 minute Total exceeds zero

Historical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Totals for 15-min, Daily, Monthly, Yearly (start date user-selectable) and Storm (with

begin and end dates)

Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Latest Flash Flood (15-min. Total, default is 0.50", 12.7 mm), 24-hour

Total, Storm Total,

Range for Rain Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 99.99" (0 to 999.7 mm )

Rain Rate

Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01" or 0.25 mm (user-selectable) at typical rates (see Fig. 3 and 4)

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0, 0.04"/hr (1 mm/hr) to 100"/hr (0 to 1999.9 mm/hr)

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5% or ±0.04"/hr (1 mm/hr) (up to 10"/hr. (250 mm/hr.)), whichever is greater

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 to 12 seconds

Calculation Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Measures time between successive tips of rain collector. Elapsed time greater than 15

minutes or only one tip of the rain collector constitutes a rain rate of zero.

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant and 1-min. Reading; Hourly, Daily, Monthly and Yearly High

Historical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-min Reading; Hourly, Daily, Monthly and Yearly Highs

Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Instant Reading

Barometric Pressure (sensor located in console)

Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01" Hg, 0.1 mm Hg, 0.1 hPa/mb (user-selectable)

Corrected Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26.00" to 32.00" Hg, 660.0 to 810.0 mm Hg, 880.0 to 1080.0 hPa/mb

Uncorrected Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.00" to 33.50" Hg, 457.0 to 850.0 mm Hg, 592.0 to 1130.0 hPa/mb

Elevation Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -999' to +12,500' (-305 m to 3810 m)

Uncorrected Reading Accuracy . . . . . . . . . . . . . . . . . . . . ±0.03" Hg (±0.8 mm Hg, ±1.0 hPa/mb) (at room temperature)

Sea-Level Reduction Equation Used . . . . . . . . . . . . . . . . United States Method employed prior to use of current "R Factor" method

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.04" Hg (±1.0 mm Hg, ±1.4 hPa/mb)

Trend (change in 3 hours) . . . . . . . . . . . . . . . . . . . . . . . . Change Š0.6" (2 hPa/mb, 1.5 mm Hg) = Rapidly

Change Š0.2" (.7hPa/mb, .5 mm Hg)= Slowly

Trend Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 position arrow: Rising (rapidly or slowly), Steady, or Falling (rapidly or slowly)

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 minutes or when console BAR key is pressed twice

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant, 15-min., and Hourly Reading; Daily, Monthly, High and Low

Historical 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 )

Inside Relative Humidity (sensor located in console)

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 to 90% RH

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5%

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 minute

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant (user adjustable) and Hourly Reading; Daily, Monthly High and Low

Historical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Readings; Daily, Monthly Highs and Lows

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Threshold from Instant Reading

Outside Relative Humidity (sensor located in ISS)

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 to 100% RH

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±3% (0 to 90% RH), ±4% (90 to 100% RH)

Temperature Coefficient . . . . . . . . . . . . . . . . . . . . . . . . . . 0.03% per °F (0.05% per °C), reference 68°F (20°C)

Drift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.5% per year

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 seconds to 1 minute

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant (user adjustable) and Hourly Reading; Daily, Monthly High and Low

Historical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Readings; Daily, Monthly Highs and Lows

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Threshold from Instant Reading

Extra Outside Relative Humidity (sensor located inside Temperature/Humidity Station)

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 100% RH

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±3% (0 to 90% RH), ±4% (90 to 100% RH)

Temperature Coefficient . . . . . . . . . . . . . . . . . . . . . . . . . . 0.03% per °F (0.05% per °C), reference 68°F (20°C)

Drift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.5% per year

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 seconds to 1 minute

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Reading (user adjustable)

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Threshold from Instant Reading

Dewpoint (calculated)

Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1°F or 1°C (user-selectable)

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -105° to +130°F (-76° to +54°C)

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±3°F (±1.5°C) (typical)

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 to 12 seconds

Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .World Meteorlogical 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 Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Calculation; Daily, Monthly High and Low

Historical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Calculations; Daily, Monthly Highs and Lows

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Threshold from Instant Calculation

Heat Index (calculated)

Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1°F or 1°C (user-selectable)

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40° to +135°F (-40° to +57°C)

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±3°F (±1.5°C) (typical)

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 to 12 seconds

Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . United States National Weather Service(NWS)/NOAA

Formulation Used. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steadman (1979) modified by US NWS/NOAA and Davis Instruments to increase range

of use

Variables Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Outside Temperature and Instant Outside Relative Humidity

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Calculation; Daily, Monthly High

Historical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Calculations; Daily, Monthly Highs

Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Instant Calculation

Evapotranspiration (calculated, requires solar radiation sensor)

Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01" or 0.25 mm (user-selectable)

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Daily to 99.99" (999.9 mm); Monthly & Yearly to 199.99" (1999.9 mm)

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Greater of 0.01" (0.25 mm) or ±5%, Reference: side-by-side comparision against a CIMIS

ET weather station

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 hour

Calculation and Source . . . . . . . . . . . . . . . . . . . . . . . . . . Penman-Monteith Equation as implemented by CIMIS (California Irrigation Management

Information System) including Net Radiation calculation

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Latest Hourly Total Calculation, Daily, Monthly, Yearly Total

Historical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly, Daily, Monthly, Yearly Totals

Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Latest Daily Total Calculation

Solar Radiation (requires solar radiation sensor)

Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 W/m2

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 1800 W/m2

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5% of full scale (Reference: Eppley PSP at 1000 W/m2)

Drift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . up to ±2% per year

Cosine Reponse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±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 Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Reading and Hourly Average; Daily, Monthly High

Historical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Average, Daily, Monthly Highs

Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Instant Reading

Temperature Humidity Sun Wind Index (requires solar radiation sensor)

Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1°F or 1°C (user-selectable)

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -90° to +135°F (-68° to +64°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 tempertature

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant and Hourly Calculation; Daily, Monthly High

Historical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Calculation; Daily, Monthly Highs

Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Instant Reading

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 10 (Extremely High))

Cosine Reponse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±4% (0° to 65° incident angle); 9% (65° to 85° incident angle)

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 seconds to 1 minute (5 minutes when dark)

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Reading and Hourly Average; Daily, Monthly High

Historical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Average, Daily, Monthly Highs

Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Instant Calculation

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 Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Latest Daily Total (user resetable at any time from Current Screen)

Historical 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

Soil Moisture (requires soil moisture Sensor)

Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 cb

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 200 cb

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.5 to 75 seconds

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Reading; Daily and Monthly High and Low

Historical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Readings; Daily and Monthly Highs and Lows

Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Thresholds from Instant Reading

Leaf Wetness (requires leaf wetness Sensor)

Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 15

Dry/Wet Threshold. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . User-selectable

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.5

Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (to be provided)

Current Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Reading; Daily High and Low; Monthly High

Historical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Readings; Daily Highs and Lows; Monthly Highs

Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Thresholds from Instant Reading

Moon Phase

Console Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1/8 (12.5%) of a lunar cycle, 1/4 (25%) of lighted face on console

WeatherLink Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . 0.09% of a lunar cycle, 0.18% of lighted face maximum (depends on screen resolution)

Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . New Moon, Waxing Cresent, First Quarter, Waxing Gibbous, Full Moon, Wanning

Gibbous, Last Quarter, Waning Cresent

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±38 minutes

Sunrise and Sunset

Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 minute

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1 minute

Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . United States Naval Observatory

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, Europe and Australia

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