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Davis Instruments GroWeather User Manual

Groweather system console
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Product # 7450 & 7455

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Summary of Contents for Davis Instruments GroWeather

  • Page 1 ’ ONSOLE ANUAL Product # 7450 & 7455...
  • Page 2 This product complies with the essential protection requirements of the EC EMC Directive 89/336/EC. © Davis Instruments Corp. 1997. All rights reserved. GroWeather™ is a trademark of Davis Instruments Corp. ® WeatherLink is a registered trademark of Davis Instruments Corp.
  • Page 3 ’ ONSOLE ANUAL...

  • Page 4: Table Of Contents

    ......22 ..1 YSTEM ... . . 6 GroWeather Manual...
  • Page 5 Viewing Air and Soil Temperature, T-H Index, and Wind Chill ..25 Selecting Units of Measure ........27 High and Low Air and Soil Temperature, T-H Index, and Wind Chill .
  • Page 6 ......53 UMBERS ATTERY ACKUP ..55 NDICATORS GroWeather Manual...
  • Page 7 Table of Contents Page iv...
  • Page 8 For gardeners, growers, forestry or public-safety agencies, golf course manag- ers, parks departments, and commercial landscape managers, the GroWeather system (simply referred to as “GroWeather” in this manual) measures environ- mental conditions which affect plant, pest, and livestock development. This...

  • Page 9: Introduction To The Groweather System

    Enables you to measure and display air temperature and growing degree-days or soil temperature. Note: You may only use two of the following sensors at a time on your GroWeather: External Tem- perature Sensor, External Temperature/Humidity Sensor, Stainless Steel Temperature Probe, or Leaf Wetness Sensor.
  • Page 10 • GroWeatherLink Software Logs data gathered by the GroWeather, downloads it to your PC, and generates reports and graphical displays. Storage interval (1, 5, 10, 15, 30, 60, or 120 minutes) is set by the user. The data logger will store 16 hours or 3, 7, 10, 21, 42, or 85 days worth of data depending on storage interval.
  • Page 11 Introduction to the GroWeather System Page 4 GroWeather Manual...

  • Page 12: Gro Weather System Overview

    GroWeather. The smaller and more rounded keys (e.g., Enter, Units, Alarm) are operations keys and are used to view or use the vari- ous features of the GroWeather.

  • Page 13: Weather Conditions Measured /Calculated

    ONDITIONS This section outlines each of the weather conditions measured/calculated by the GroWeather. Each section includes a brief discussion of the weather condi- tion and a listing of the various ways in which the unit displays or stores that condition. Be aware that some of the weather conditions require an optional sensor in order to measure/calculate a value (see “Optional Sensors”...

  • Page 14: Growing Degree-Days (Heat Units)

    The GroWeather uses the temperature reading in conjunction with the base and upper thresholds which you set (see “Setting Thresholds” on page 24) to calcu- late degree-days.

  • Page 15: Air, Soil, And Apparent Temperature

    Note: The GroWeather measures T-H Index only when air temperature is above 68˚ F (20˚ C) because it is a measure of heat stress, which is not significant at lower temperatures. 125˚ F (52˚ C) is the highest T-H Index for which calculation factors are available.

  • Page 16: Wind

    1 Langley = 41.84 kiloJoules per square meter = 11.622 Watt-hours per square meter = 3.687 BTUs per square foot Note: The GroWeather measures energy received in the spectral band between 400 and 1100 nm. • Current Solar Radiation Intensity • “Daily” Incident Solar Energy Sum (AutoClear) •...

  • Page 17: Rainfall

    The total rainfall amount must be cleared manually; how often you clear the register determines what period of time its rainfall total reflects. The GroWeather also calculates the rate of rainfall by measuring the interval of time between each .01” or .2 mm rainfall increment.

  • Page 18: Relative Humidity

    The leaf wetness reading ranges from 0 (dry) to 15. • Current Dew-Point (Alarm: when temperature is within 2˚F of dew-point) • Leaf Wetness GroWeather Manual Weather Conditions Measured/Calculated Page 11...

  • Page 19: Time

    GroWeather System Overview Time The GroWeather has a clock and a calendar for tracking time and date. The cal- endar automatically adjusts during leap years, providing you enter the current year (see “Entering Time, Date, or Year” on page 43) when you apply power to the unit.

  • Page 20: High And Low

    Please note, however, that the date is only stored as long as it falls within 14 days of the current date. After 14 days, the GroWeather dis- plays only the high/low reading and the time; the date appears as a series of dashes.

  • Page 21: Larms

    Relative Humidity LARMS The GroWeather features a set of alarms which can be programmed to sound whenever a reading exceeds a set value. With the exception of barometric pres- sure, dew-point, and time, all alarms sound when a reading reaches the alarm threshold and will continue to sound until the reading returns to within the threshold.
  • Page 22 AutoClear may interfere with triggering the alarm at the appropriate time. A new feature in the GroWeather allows you to set the station to gener- ate a signal for every hundredth-inch of ETo. For example, if in an hour, three-hundredths of an inch ETo is returned to the air, at the end of the hour 3 discrete signals will be generated by the station.
  • Page 23 GroWeather System Overview Page 16 GroWeather Manual...

  • Page 24: Using The Gro Weather

    The ENTER key is used to enter or change data (such as an alarm threshold set- ting). You should become familiar with the use of this key, since it serves many purposes in operating the GroWeather. The ENTER key has two basic modes of operation, each of which is explained below.

  • Page 25: Entering Negative Numbers

    Using the GroWeather • Press and hold Pressing and holding ENTER makes the next digit in the value active and to begins cycling through all available entries for the active digit (or dig- its). As long as you hold ENTER down, the station will continue to cycle through all possible entries for that digit.
  • Page 26 12. When you have entered the correct time, wait four seconds without pressing any keys. After four seconds, the GroWeather saves the entry and returns to normal operation. The time you just entered will appear in the display as the current time.

  • Page 27: Evapo Transpiration

    Using the GroWeather VAPO RANSPIRATION The GroWeather displays the daily ETo sum, the total ETo for the period, and the average ETo per day during the period (see “Period” on page 12). You may display ETo in inches or millimeters.

  • Page 28: Selecting Units Of Measure

    Selecting Units of Measure To select the desired unit of measure for ETo, simply press UNITS while viewing any of the ETo displays (except AutoClear or Period). As you press UNITS, the GroWeather alternates between inches (in) and millimeters (mm). GroWeather Manual...

  • Page 29: Clearing Daily Eto Sum

    ROWING EGREE The GroWeather displays daily degree-days, total degree-days during the period, and the average degree-days per day during the period (see “Period” on page 12). You must set a base threshold and you may choose to set a high threshold.

  • Page 30: Growing Degree-Day

    4. To display the base degree-days threshold, press DEG DAYS again. The base threshold appears on the right of the display. 5. To display the upper degree-days threshold, press DEG DAYS again. The upper threshold appears on the right of the display. GroWeather Manual OTAL EGREE URING...

  • Page 31: Selecting Units Of Measure

    To select the desired units of measure for degree-days, simply press UNITS while viewing any of the degree-days displays (except AutoClear or Period). As you press UNITS, the GroWeather alternates between F and C. All degree-day and temperature information (including air temperature, soil temperature, T-H Index, wind chill, and dew-point) appears in the units of measure you select.

  • Page 32: Clearing Daily Degree-Days Sum

    “Alarms” on page 47). PPARENT The GroWeather displays the current air temperature, soil temperature, tem- perature/humidity index (T-H Index), and wind chill. In addition, you may view the high and low air temperature, the high T-H Index, and the low wind chill along with the time and date at which they occurred.
  • Page 33 Using the GroWeather 2. To display the current soil temperature, press TEMP again. The current soil temperature appears on the right of the display. 3. To display the current T-H Index, press TEMP again. The current T-H Index appears on the right of the display.

  • Page 34: Selecting Units Of Measure

    To select the desired unit of measure, simply press UNITS while viewing any of the temperature or apparent temperature displays (except Auto- Clear). As you press UNITS, the GroWeather alternates between ˚F and ˚C. (If viewing air or soil temperature, you may also select between 1˚ and 0.1˚...

  • Page 35: Wind

    flashing diamond at one of these points. Current wind speed and the unit of measure in which wind speed is being displayed appear at the center of the compass rose. The compass rose appears on the GroWeather display at almost all times (it does not appear when displaying degree-days or rainfall, for example).
  • Page 36 If the AutoClear function is disabled, the word OFF appears on the right of the display. (See “Enabling/Disabling AutoClear” on page 51 for instructions.) 7. Continuing to press WIND will cycle through the wind displays in a continuous loop. GroWeather Manual VERAGE AILY IRECTION...

  • Page 37: Selecting Units Of Measure

    GroWeather cycles through the available units of measure. High Wind Speed The GroWeather displays the high wind speed along with the time and date at which it occurred and the direction of the gust. For information on displaying and clearing highs and lows, see “Highs and Lows” starting on page 45.

  • Page 38: Solar Radiation

    OLAR ADIATION The GroWeather displays the current solar radiation intensity, the daily inci- dent solar energy total, and the average daily incident solar energy per day during the period. (Note that this manual refers to incident solar energy as sim- ply solar energy.) Solar radiation is displayed in Watts per square meter...

  • Page 39: Clearing Daily Solar Energy

    Using the GroWeather 5. To display the status of the AutoClear function for daily solar energy, press SUN again. If the AutoClear function is enabled, the word On appears on the right of the display. If the AutoClear function is disabled, the word OFF appears on the right of the display.

  • Page 40: Viewing Rainfall

    Note: You may not enable/disable the AutoClear function separately for daily rainfall and high rate of rainfall. These two functions are “linked” and AutoClear for them must be either enabled or dis- abled together. 4. Continuing to press RAIN will cycle through the Rain displays in a continuous loop. GroWeather Manual AILY AINFALL OTAL...

  • Page 41: Selecting Units Of Measure

    High Rate of Rainfall The GroWeather displays the high rate of rainfall along with the time and date at which it occurred. For information on displaying and clearing highs and lows, see “Highs and Lows”...

  • Page 42: Alarms

    You may set a high alarm for daily rainfall. (See “Alarms” on page 47.) AROMETRIC RESSURE The GroWeather displays current barometric pressure in inches of Hg (in), mil- limeters of Hg (mm), and hectoPascals (hPa). You may also store a barometric pressure value at any time for use in determining the barometric pressure trend.

  • Page 43: Viewing Barometric Pressure

    The current barometric pressure appears on the right of the display. Selecting Units of Measure To select the desired unit of measure, simply press UNITS while viewing the current barometric pressure. As you press UNITS, the GroWeather cycles between in, mm, and hPa. Page 36...

  • Page 44: Entering Barometric Pressure

    Because atmospheric pressure varies with both altitude and local weather con- ditions, you must enter the current barometric pressure for your location. Wait at least one hour after powering the GroWeather (to allow the circuit a chance to stabilize) before you enter barometric pressure. Once the barometric pres- sure is set, the GroWeather will calculate and display the correct barometric pressure until the unit is moved to a different altitude or power is interrupted.

  • Page 45: Storing Barometric Pressure

    The date on which the barometric pressure was stored will automatically appear on the right of the display. As long as you do not press a key, the GroWeather will continue to alternate between the stored value, the time, and the date.

  • Page 46: High And Low Relative Humidity

    47.) OINT AND The GroWeather displays the current dew-point in either ˚F or ˚C and leaf wet- ness as a range from 0 (dry) to 15. You may need to select between the soil tem- perature sensor and the leaf wetness sensor as described below. The default setting is for the soil temperature sensor.

  • Page 47: Selecting Units Of Measure

    Selecting Units of Measure To select the desired unit of measure, simply press UNITS while viewing the current dew-point. As you press UNITS, the GroWeather alternates between ˚F and ˚C. All temperature and degree-day readings (including air tempera- ture, soil temperature, T-H Index, and wind chill) appear in the unit of mea- sure you select.

  • Page 48: Time

    Month-Day (Mo-Day) or Day.Month (Day.Mo) format. You may set the time, the date, the year, and the time at which you wish the GroWeather to perform the AutoClear each day. In addition, you may begin a new period, erasing all information from the previous period.
  • Page 49 Using the GroWeather 4. To display the time at which the GroWeather executes the AutoClear function each day, press TIME again. The time at which the GroWeather executes the AutoClear function each day appears on the right of the display.

  • Page 50: Selecting Display Format

    Selecting Display Format To select the desired display format, simply press UNITS while viewing either the time or the date. As you press UNITS, the GroWeather alternates between the available time/date formats. Entering Time, Date, or Year 1. Press TIME as necessary to display the time, date, or year, as desired.

  • Page 51: Clearing Period Information/Starting A New Period

    Using the GroWeather 3. Press any function key to exit. The GroWeather saves the AutoClear time. At the set time each day, the GroWeather clears those functions for which AutoClear is enabled (See “Enabling/Disabling AutoClear” on page 51). Clearing Period Information/Starting a New Period When you begin a new period, all information which is listed as being “over...

  • Page 52: High And Low"

    IGHS AND The GroWeather stores highs/lows for many of its functions. The table con- tained in “Highs and Lows” starting on page 13 lists all of the highs and lows stored/displayed by the GroWeather. The procedure for displaying and clear- ing highs and lows is the same for each high/low.

  • Page 53: Clearing Highs And Lows

    When the value stops flashing it means that the high/low has been cleared. It is not uncommon for another high/low reading to appear almost immedi- ately. This is simply because the GroWeather is constantly in the process of recording new highs and lows.

  • Page 54: Alarms

    Note: You may silence the beeping by pressing CLEAR at any time, though the alarm display remains. If more than one alarm is triggered at once, the GroWeather scans through all of the triggered alarms, displaying each for approximately four seconds before moving to the next.

  • Page 55: Setting A Normal Alarm Threshold

    4. Press any function key to save and exit. Example of Setting an Alarm Threshold: Low Outside Air Temperature Alarm This example shows you how to set the GroWeather’s low outside air tempera- ture alarm to 32˚F. 1. Press TEMP as necessary to display outside air temperature.

  • Page 56: "Daily " Eto Alarm

    “daily” ETo at the moment that the alarm was triggered.) A new feature in the GroWeather allows you to set the station to generate a sig- nal for every hundredth-inch of ETo. For example, if in an hour, three-hun- dredths of an inch ETo is returned to the air, at the end of the hour 3 discrete signals will be generated by the station.

  • Page 57: To Silence An Alarm

    Using the GroWeather Setting the Dew-Point Alarm The dew-point alarm is a special alarm that is triggered when the temperature comes within 2˚F of the dew-point. 1. Press DEW to display the current dew-point. 2. Press ALARM to display the dew-point alarm threshold.

  • Page 58: Enabling/Disabling Autoclear

    1. Press the appropriate key(s) to display the desired weather condition’s AutoClear dis- play. 2. Press ENTER to alternate the status between on and off. 3. Press any function key to save and exit. GroWeather Manual LARM LEARED LEAR YPICAL...

  • Page 59: General High /Low Clear

    Using the GroWeather ENERAL The GroWeather includes a general clear feature which enables you to quickly clear most of the high and low registers. The general clear feature, however, will not clear any high/low value for which AutoClear (see “AutoClear” on page 13) has been turned on.

  • Page 60: D Isplay Can

    The GroWeather comes with two pre-programmed scan routines which contin- uously cycle through various displays. The short scan routine displays the cur- rent value of every condition measured or calculated by the GroWeather. The long scan routine displays the current value of every condition measured or calculated and every high/low stored by the GroWeather.

  • Page 61: Wind Speed

    1 mm 1 mm Note: Rainfall CAL must be a whole integer (no decimals). Generally, if the GroWeather is set to display rainfall in a unit of measure other than the rain collector’s “native” unit of measure, you would be required to enter a CAL number which was not a whole integer.

  • Page 62: Changing Calibration Numbers

    4. Reattach the power adapter and insert the battery. The unit will start up again and all CAL numbers will be reset to their default values. 5. Re-enter the total rainfall, barometric pressure, and all alarm settings. GroWeather Manual Calibration Numbers Page 55...
  • Page 63 Using the GroWeather RIMARY OWER AND The GroWeather display contains two “troubleshooting” indicators which help protect against accidental interruption of power. Both indicators appear in the upper left hand corner of the display and they may appear singly or together.

  • Page 65: Function Keys

    EATHER UNCTION The lists below indicate what condition appears when you press each function key. Each time you press the key, the next item in the list appears. ET (Evapotranspiration) Daily ETo Sum Total ETo for the Period Average Daily ETo for the Period Period Start Date ETo AutoClear Status DEG DAYS (Growing Degree-Days)

This manual is also suitable for:

Groweather 7450Groweather 7455

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