Integrated Sensor Suite (ISS)
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . .-40to +150F (-40to +65C)
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . -50to +158F (-45to +70C)
Current Draw (ISS SIM only) . . . . . . . . . . . . . . . . . . . . . . 0.14 mA (average), 30 mA (peak) at 4 to 6 VDC
Solar Power Panel (ISS SIM / Fan-Aspirated) . . . . . . . . . . 0.5 Watts / 0.75 Watts
Battery (ISS SIM /Fan-Aspirated) . . . . . . . . . . . . . . . .. . . CR-123 3-Volt Lithium cell / 2 - 1.2 Volt NiCad C-cells
Battery Life (3-Volt Lithium cell) . . . . . . . . . . . . . . . . . . . . 8 months without sunlight - 2+ years on solar
Battery Life (NiCad C-cells) . . . . . . . . . . . . . . . . . . . . . . . 1 year
Fan Aspiration Rate (Fan-Aspirated Only) . . . . . . . . . . . . 190 feet/min. (0.9 m/s) (full sun), 80 feet/min. (0.4 m/s) (battery only) (intake flow rate) 500 feet/min. (2.5 m/s) (full sun), 280 feet/min. (1.4 m/s) (battery only) (sensor chamber flow rate)
Connectors, Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Modular RJ-11
Cable Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-conductor, 26 AWG
Cable Length, Anemometer . . . . . . . . . . . . . . . . . . . . . . . 40' (12 m) (included), 240' (73 m) (maximum recommended)
Wind Speed Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . Large wind cups with magnetic switch
Wind Direction Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . Wind vane with potentiometer
Rain Collector Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tip bucket, 0.01" per tip (0.2 mm with metric rain adapter), 33.2 in2 (214 cm2) collection area
Temperature Sensor Type. . . . . . . . . . . . . . . . . . . . . . . . Thermistor
Relative Humidity Sensor Type . . . . . . . . . . . . . . . . . . . . Film capacitor element
Housing Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UV-resistant PVC plastic
Console
Console Operating Temperature . . . . . . . . . . . . . . . . . . . +14to +140F (-10to +60C)
Display Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . +32to +140F (0to +60C)
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . -5to +158F (-20to +70C)
Current Draw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.90 mA average, 20 mA peak, (plus 120 mA for display lamps, plus 0.125 mA for each optional wireless transmitter received by the console) at 4 to 6 VDC
AC Power Adapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 VDC, 900 mA, regulated
Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 C-cells
Battery Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . up to 9 months
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Modular RJ-11
Housing Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UV-resistant PVC plastic
Console Display Type . . . . . . . . . . . . . . . . . . . . . . . . . . . LCD Transflective
Dimensions (console: length x width x height; Display: length x height)
Console with antenna . . . . . . . . . . . . . . . . . . . . . . . 10.375" x 1.5" x 6.13" (264 mm x 38 mm x 156 mm)
Console with antenna extended up . . . . . . . . . . . . . 10.375" x 1.5" x 9.8" (264 mm x 38 mm x 248 mm)
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.94" x 3.375" (151 mm x 86 mm)
Weight (with batteries) . . . . . . . . . . . . . . . . . . . . . . . . . . 1.88 lbs. (.85 kg)
Data Displayed on Console
The data display categories represent all weather variables that the console displays and are listed in alphabetical order. General describes the general ways in which data is displayed and archived for all data display categories and is listed first as a point of reference. See the individual data display categories for specific display information.
General
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 Display Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Current display data describes the current reading for each weather variable. In most cases, the variable lists the most recently updated reading or calculation. Some current variable displays can be adjusted so there is an offset for the reading.
Current Graph Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Current graph 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. Display intervals vary. Examples include: Instant, 15-min., and Hourly Reading; Daily, Monthly, High and Low
Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Includes the past 24 values listed unless otherwise noted; all can be cleared and all totals reset. Display intervals vary.Examples include: 15-min., and Hourly Reading; Daily, Monthly, High and Low
Graph Time Interval Length . . . . . . . . . . . . . . . . . . . . . . . 1 min., 10 min., 15 min., 1 hour, 1 day, 1 month, 1 year (userselectable, 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 specifications
Barometric Pressure
Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . Measured in 0.01" Hg. Other units are converted from Hg and rounded to nearest 0.1 mm, 0.1 hPa, 0.1mb.
Corrected Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26.00" to 32.00" Hg, 660.0 to 810.0 mm Hg, 880.0 to 1080.0 hPa/mb
Uncorrected Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.00" to 33.50" Hg, 406.0 to 850.0 mm Hg, 542.0 to 1130.0 hPa/mb
Elevation Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1500' to +15,300' (-460 m to 4670 m). The console screen limits display of lower elevation to -999' when using feet as elevation unit.
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 0.06" (2 hPa/mb, 1.5 mm Hg) = Rapidly Change 0.02" (0.7hPa/mb, 0.5 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 Display Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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, 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
Dewpoint (calculated)
Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . Measured in 1F. Celsius is converted from Fahrenheit and rounded to the nearest 1°C.
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -105to +130F (-76to +54C)
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3F (1.5C) (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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . Measured in 0.01". Converted to mm and rounded to nearest 0.2 mm
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 comparison 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 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
Forecast
Variables Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Barometric Reading & Trend, Wind Speed & Direction, Rainfall, Time of Year Temperature, Humidity, Latitude & Longitude,
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
Heat Index (calculated)
Solution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1F or 1C. Celsius is converted from Fahrenheit and rounded to the nearest 1°C
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40to +135F (-40to +57C)
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . °3F (1.5C) (typical)
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 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 Display Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Calculation
Current Graph Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Calculation; Daily, Monthly High
Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Hourly Calculations; Daily, Monthly Highs
Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Instant Calculation
Humidity
Inside Relative Humidity (sensor located in console) Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . 1%
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 100% RH
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5%
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 minute
Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . Instant (user-adjustable offset available)
Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . Instant, Hourly Reading; Daily, Monthly High and Low
Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . Hourly Readings; Daily, Monthly Highs and Lows
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Threshold from Instant Reading
Outside Relative Humidity (sensor located in ISS) Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . 1%
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 68F (20C)
Drift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5% per year
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 seconds to 1 minute
Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . Instant (user-adjustable offset available)
Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . Instant and Hourly Reading; Daily, Monthly High and Low
Historical Graph 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)
Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . 1%
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 68F (20C)
Drift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5% per year
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 seconds to 1 minute
Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . Instant (user-adjustable offset available)
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High and Low Threshold 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 to 18 seconds
Current Graph Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant Reading; Daily High and Low; Monthly High
Historical Graph 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 Crescent, First Quarter, Waxing Gibbous, Full Moon, Wanning Gibbous, Last Quarter, Waning Present
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 minutes
Rainfall
Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01" or 0.2 mm with optional metric adapter (included) (Console rounds 1 mm if rain totals are 2000 mm or higher)
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 accumulation ends a storm event
Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Totals for Past 15-min
Current Graph 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 Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . Totals for 15-min, Daily, Monthly, Yearly (start date user-selectable) and Storm (with begin and end dates)
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold called "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 0.2 mm (with optional metric adapter (included)) at typical rates (see Fig. 2 and 3)
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 Display Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant
Current Graph Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant and 1-min. Reading; Hourly, Daily, Monthly and Yearly High
Historical Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-min Reading; Hourly, Daily, Monthly and Yearly Highs
Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Threshold from Instant Reading
Soil Moisture (requires Soil Moisture Sensor)
Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 cb
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 200 cb
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.5 to 75 seconds
Current Graph Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instant; 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
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 Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3% for angle of incidence from 0to 75
Temperature Coefficient . . . . . . . . . . . . . . . . . . . . . . . . . -0.067% per F (-0.12% per C); reference temperature = 77F (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: 0.1F or 1F or 0.1C or 1C.(nominal). Celsius is converted from Fahrenheit and rounded to the nearest 0.1or 1C. Historical Graph Data and Alarms: 1F or 1C. Celsius is converted from Fahrenheit and rounded to the nearest 1C.
Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +32to +140F (0to +60C)
Sensor Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . °1°F (°0.5°C) typical
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 minute
Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . Instant (user-adjustable offset available)
Current Graph Data . . . . . . . . . . . . . . . . . . . . . . . . . Instant; 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.°(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 convertedfrom 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/m2, 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 (user adjustable); 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
Extra Temperature Sensors or Probes
Resolution and Units . . . . . . . . . . . . . . . . . . . . . . . . 1°F 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)
Update Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 to 12 seconds (40 to 48 seconds for Leaf Wetness/Temperature and Soil Moisture/Temperature Stations)
Current Display Data . . . . . . . . . . . . . . . . . . . . . . . . Instant (user-adjustable offset available)
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 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
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 ReadingUltra 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)
