WEATHER MONITOR II ® O WNER ’ S M ANUAL Product # 7440
Product Numbers: 7440 {CS, EZ, W, WS, M, EU, UK} Davis Instruments Part Number: 7395.002 Weather Monitor II Controlled Online: DI:Weather Manuals:Consoles:Weather Monitor II Rev. F Manual (5/4/00) ® This product complies with the essential protection requirements of the EC EMC Directive 89/336/EC. © Davis Instruments Corp. 2000. All rights reserved. Weather Monitor II and WeatherLink are registered trademarks of Davis Instruments Corp. Macintosh is a registered trademark of Apple Computer, Inc.
TABLE OF CONTENTS INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tools and Materials Needed for Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A Typical Installation . . . . . . . . . .
Table of Contents CALIBRATION NUMBERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Inside and Outside Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wind Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Humidity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rainfall . . . . . . . . . . . . . . . . .
System Components 1. INTRODUCTION The Weather Monitor II provides sophisticated monitoring and logging of essential weather conditions such as inside and outside temperature, barometric pressure, wind direction, wind speed and wind chill. This instruction manual takes you step-by-step through the process of assembling, testing, and installing your Weather Monitor II so you can begin collecting data as soon as possible.
Introduction O PTIONAL A CCESSORIES The following accessories are designed for use with the Weather Monitor II. • External Temperature/Humidity Sensor Replaces the standard external temperature sensor. Allows you to measure outside humidity and dew point in addition to temperature. Includes 40 feet (12.2 meters) of cable. • Rain Collector Enables you to measure daily and accumulated rainfall. Separate models measure rainfall in either 0.01 inch or 0.2 mm increments.
Tools and Materials Needed for Installation T OOLS AND M ATERIALS N EEDED FOR I NSTALLATION In addition to the enclosed components, you will need the following tools and materials to complete the installation. Please be sure you have everything you need before proceeding with the installation.
Introduction A T YPICAL I NSTALLATION Rain Collector (optional) Anemometer WEATHER MONITOR II AC Power Adapter External Temperature Sensor To WeatherLink (optional) Power Outlet TEMP WEATHER COMPUTER RAIN WIND NORTH SIDE OF BUILDING in Northern Hemisphere SOUTH SIDE OF BUILDING in Southern Hemisphere Junction Box Cable Junction Box The diagram above shows a typical Weather Monitor II installation. The following pages will give you specific instructions for installing your station.
Powering the Weather Monitor II 2. A S S E M B L I N G T H E S T A T I O N The Weather Monitor II is a precision instrument, designed to give extremely accurate readings. As with any precision instrument, care must be used during assembly. These instructions detail how to assemble the stations with a minimum of time and effort. P OWERING THE W EATHER M ONITOR II The Weather Monitor II is powered by 9- to 12-volt DC (direct current).
Assembling the Station 3. Plug the other end of the power adapter into an appropriate power outlet or, preferably, into a computer-grade surge protector. It is highly recommended that you plug the power adapter into a computer-grade surge protector, especially in high-lightning areas. Once power is applied, the console should run through a brief self-test procedure.
Assembling the Anemometer Avoid lubricating the wind cup shaft and bearings or the wind vane shaft. Natural or synthetic lubricant reduces the anemometer’s efficiency. Note: Do NOT attach the wind vane now. Install the anemometer before attaching wind vane. (See page 11) To Attach the Anemometer Arm to the Anemometer Base 1. Insert the anemometer arm into the anemometer base, sliding cable through the slot in the base as shown. Line up the small hole in the arm with the holes in the base. 2.
Assembling the Station 3. Install the small end of the other drip ring on the WIND CUP END OF THE ANEMOMETER CONTROL HEAD as shown below. Gently push up the drip ring until it reaches the groove on the control head. The wind cup end of the control head has the smaller of the two stainless steel shafts. When attaching the drip ring, make sure the lower edge of the ring is aligned with the lower edge of the control head. SECURING DRIP RING ON CONTROL HEAD 4.
Testing the Anemometer 3. T E S T I N G T H E S T A T I O N Before doing anything else, test the station in your living room or workshop. If you have purchased the optional rain collector or additional sensors, now is the time to assemble and test these using the appropriate manual. Consult the Troubleshooting Guide on page 39, or the guides in the respective manuals, if you experience any difficulty.
Installing the Station 4. INSTALLING THE STATION Make sure you have thoroughly tested the station before installing it. Then, decide where you will place each component—the junction box, the console, and all external sensors. Pay close attention to the suggestions given in the sections dealing with the individual components, as well as the following general suggestions: • The junction box cable must be able to reach the console. If you want to place the junction box and console more than 8 feet (2.
Installing the Anemometer A NTENNA M AST OR M ETAL P IPE - OUTSIDE DIAMETER 3/4 TO 1 1/4 INCHES (19 TO 32 MM ) 1. Make sure that the antenna mast or metal pipe is properly grounded. If you are not sure, consult a qualified professional. 2. Hold the anemometer base against the pipe and insert the two U-bolts through the back of the base so that the U-bolts wrap around the pipe. 3. Place a 1/4-inch washer and a 1/4-20 hex nut over each end of the U-bolts. Use a wrench to tighten the hex nuts.
Installing the Station 7. Use the allen wrench provided to tighten the set screw on the side of the wind vane. Do not over-tighten. Push the wind vane onto the stainless steel shaft Tighten set screw with allen wrench 8. Test your assembly by pointing the wind vane in any direction and—using the compass or map as a guide—making sure the console displays the correct wind direction. Re-adjust the wind vane if necessary. To Complete the Installation 1.
Mounting the Junction Box To Install the External Temperature Sensor 1. Disconnect the external temperature sensor cable from the junction box. 2. Wrap the TEMP cable labels around each end of the cable. 3. Place the sensor wherever you wish to measure the temperature. 4. Plug the end of the external temperature sensor cable back into the jack marked TEMP on the junction box. 5. Check the temperature display to make sure you are getting a temperature reading. 6.
Installing the Station D ISPLAYING THE C ONSOLE Most people position the console indoors in a location where the keyboard is readily accessible and the display is easy to read. Some install the console outdoors in a weather-proof shelter (such as the Multi-Purpose or Complete System Shelter). Indoors For the most accurate indoor readings, follow these suggestions: • Avoid placing the console in direct sunlight. The black casing heats up in direct sunlight.
Displaying the Console To Display the Console on a Tabletop To display the console on a table or desk, attach the base as shown below and guide the cables through the slots indicated. To Display the Console on a Shelf To display the console upright on a shelf, attach the base as shown below and guide the cables through the slots indicated. To Display the Console on a Wall 1. Hold the mounting base flat against the wall and use a pencil to mark the location of the two keyholes. 2.
Using the Weather Functions 5. USING THE WEATHER FUNCTIONS U SING THE E NTER K EY The ENTER key is used to enter or change data. You should become familiar with the use of this key, since it serves many purposes in operating the Weather Monitor II. To Change Data Using the Enter Key 1. Press ENTER and hold it down. The first digit on the left will flash and then begin to cycle through all the possible entries for the function you are changing. 2.
Highs and Lows 4. Release ENTER when the current hour appears. 5. Press ENTER again and hold it down to change the tens position in minutes (the third digit from the left). The digits cycle from 0 to 5 as you hold down ENTER. 6. Release ENTER when the correct number appears. 7. Press ENTER again and hold it down to change the ones position in minutes (the fourth digit from the left). The digits cycle from 0 to 9 as you hold down ENTER. 8. Release ENTER when the correct number appears. 9. Press TIME twice.
Using the Weather Functions Highs and lows are stored in memory along with the time and the date at which they occurred. To see what time a high or low was recorded, wait a few seconds after pressing RECL. The time the high or low occurred will appear. Wait a few more seconds and the date will appear. N HIGH NW N OUTSIDE TEMPERATURE NE HIGH NW NE F W E W E MPH MPH SW SE SW SE BAROMETRIC TREND S S SPEED High Outside Temperature: 92.
Temperature To Change the Time Format 1. Press TIME once or twice to select the time. 2. Press UNITS. The console switches from the 12-hour to the 24-hour format (or vice versa) and the symbol changes from AM or PM to 24 HR (or vice versa). To return to the original format, press UNITS again. N NW NE 24HR W E MPH SW SE BAROMETRIC TREND S 24-HOUR TIME DISPLAY To Change the Time 1. Press TIME once or twice to select the time. 2. Press UNITS to select the 12-or24-hour format, as desired. 3.
Using the Weather Functions To Display Current Temperatures 1. To display inside temperature, press TEMP. The inside temperature reading and the word INSIDE appear on the display. 2. To display outside temperature, press TEMP again. The outside temperature reading and the word OUTSIDE appear on the display. N N OUTSIDE NW TEMPERATURE NE NW INSIDE NE TEMPERATURE F W C E W E MPH SW MPH SE SW SE BAROMETRIC TREND S BAROMETRIC TREND S Outside Temperature: 68.
Wind Speed and Wind Direction 3. Press CLEAR and hold it down. The display will flash several times, and then the old reading will be replaced by the current temperature. As the temperature rises and falls, the high and/or low will be updated. 4. Press any key to exit. Note: High and low temperatures are independent of each other. Clearing the high temperature does not clear the low temperature, and vice versa. You must clear each individually.
Using the Weather Functions To Display Current Wind Speed and Wind Direction 1. To display wind speed, press WIND. The current wind speed and the word SPEED appear on the display. 2. To display wind direction, press WIND again. The current wind direction and the word DIRECTION appear on the display.
Wind Chill To Use the High Wind Speed Alarm For instructions on how to use the high wind speed alarm, see “Alarms” on page 30. W IND C HILL Wind chill is a measure of the effect of wind on our perception of temperature. Through a process known as convection, wind cools off your body by transferring heat more quickly into the surrounding air. As a result, when the wind is blowing, you perceive the temperature to be cooler than it actually is.
Using the Weather Functions To Clear the Low Wind Chill 1. Press WIND CHILL. 2. Press RECL. 3. Press CLEAR and hold it down. The display will flash several times, and then the low wind chill will be replaced by the current wind chill. As the wind chill falls, the low will be updated. 4. Press any key to exit. To Use the Low Wind Chill Alarm For instructions on how to use the low wind chill alarm, see “Alarms” on page 30.
Barometric Pressure To Set the Barometric Pressure 1. Find the current local barometric pressure. You may be able to get local barometric pressure readings fromTV and radio weather reports, or your local airport control tower. Barometric pressure readings are also available on the internet. • For baromeric pressure readings in the U.S., go to http://iwin.nws.noaa.gov Choose “Text version” and then choose “State Data”. • For barometric pressure readings outside the U.S., a good place to check is www.wmo.
Using the Weather Functions To Change the Unit of Measure 1. Press BAR. 2. Press UNITS until the desired unit of measure (IN, MM or MB) appears in the display. N N NW NW NE MM E W MPH W E MPH BAROMETER SE SW NE SW BAROMETRIC TREND S BAROMETER Barometer: 758.7 mm of Hg MB SE BAROMETRIC TREND S Barometer: 1011.5 mb BAROMETRIC PRESSURE IN MILLIMETERS AND MILLIBARS To Display the Stored Barometric Pressure 1. Press BAR to display barometric pressure. 2.
Humidity The Barometric Trend Function The barometric trend arrow, which appears on the bottom right hand corner of the display, BAROMETRIC gives you an indication of which way baroTREND metric pressure is moving. If barometric pressure changed by less than 0.02 inches of Hg BAROMETRIC TREND ARROW (1 millibar 0.75 millimeters of Hg) over approximately the past hour, the arrow will be horizontal—steady barometric pressure. If barometric pressure rose by 0.
Using the Weather Functions 2. To display outside humidity, press HUM again. The outside humidity reading and the word OUTSIDE appear on the display. N OUTSIDE NW N HUMIDITY NW NE W E W E MPH SW HUMIDITY INSIDE NE MPH SE SW BAROMETRIC TREND S Outside Humidity: 65% SE S BAROMETRIC TREND Inside Humidity: 26% HUMIDITY DISPLAYS To Display High and Low Humidities 1. Press HUM once or twice to select inside or outside humidity, as desired. 2. Press RECL to display the high.
Dew Point D EW P OINT Dew point is a measure of the absolute amount of water vapor in the air expressed as a temperature reading. The temperature reading represents the temperature at which water condenses from the air. If temperature and dew point are the same, the result will be fog and/or dew. Dew point can be displayed in either ˚F or ˚C, in increments of 1˚.
Using the Console Functions 6. USING THE CONSOLE FUNCTIONS A LARMS The Weather Monitor II features a set of alarms which can be programmed to sound whenever a reading passes a particular point. Check the chart below to determine which functions have alarms and what kind of alarms they have. All alarms (except barometric pressure, dew point, and time) behave in basically the same way. The general procedure for displaying and setting alarms is covered below.
Alarms If more than one alarm is sounding at once, the Weather Monitor II will scan through all of the triggered alarms, displaying each for approximately four seconds before moving to the next.
Using the Console Functions 3. Press ALARM twice to display the low alarm setting. 4. Use ENTER to set the alarm to 40˚F (see “Using the Enter Key” on page 16 for instructions). N LOW OUTSIDE NW NE ALARM TEMPERATURE F W E MPH SW SE BAROMETRIC TREND S LOW OUTSIDE TEMPERATURE ALARM (EXAMPLE) 5. Press TEMP to exit. The alarm is now set and will sound when the outside temperature drops below 40˚F. To Set the Barometric Trend Alarm 1. Press BAR. 2. Press UNITS to select the desired unit of measure.
Total Clear To Clear an Alarm 1. Since the function triggering the alarm is already on the display, simply press ALARM once or twice to get the desired alarm setting (high or low) for that function. If more than one alarm is sounding, wait until the function you want to clear appears before you press ALARM. 2. Press and hold down CLEAR until the display shows a series of dashes. N LOW OUTSIDE NW NE W HUMIDITY ALARM E MPH SW SE BAROMETRIC TREND S CLEARING AN ALARM 3. Press any key to exit.
Using the Console Functions To Use Total Clear 1. Display any function except highs or lows, alarms, or daily accumulated rainfall. 2. Press CLEAR and hold it down. The unit will beep and the display will flash seven times and then stop. When this happens, the functions listed above have been cleared. A UTO S CAN The Weather Monitor II can be set to perform an automatic scan of the weather functions.
Display Lamp To Program a Customized Scan Routine 1. Press SCAN. 2. Press ENTER. The compass rose and barometric trend arrow disappear and the word SCAN appears. After a few seconds, the display will begin to alternate between the word SCAN and the normal display to let you know you are in scan entry mode. OUTSIDE TEMPERATURE SCAN ENTRY MODE 3. Press the appropriate keys to display the first function you wish to scan. For example, press HUM twice and RECL once for High Outside Humidity. 4.
Calibration Numbers 7. CALIBRATION NUMBERS Calibration (CAL) numbers are used to turn raw data from the sensors into meaningful readings on the display. The standard or default CAL numbers are automatically entered by the unit when it is first powered up and whenever power is lost and later restored. Calibration numbers should not be changed except for certain specialized applications.
Rainfall R AINFALL Each station uses a rainfall calibration number (CAL) to determine how much water each bucket tip (i.e., pulse) represents. The default calibration number for rainfall assumes that you use a 0.01” rain collector. CALIBRATED RAINFALL = # OF PULSES X (1 / CAL) Default CAL = 100 (for 0.01" rain collector). If you have a 0.2 mm rain collector, you must change the calibration number. First adjust the console to display rainfall in millimeters and then change CAL to 0005.
Calibration Numbers R ESETTING C ALIBRATION N UMBERS TO D EFAULT 1. Write down the current barometric pressure, accumulated rainfall, and all alarm settings. You will need to reenter these values later. 2. Also write down all highs, lows, and daily rainfall. These values will be lost and cannot be restored. 3. Remove the battery, if applicable, and unplug the power adapter from the console. All power must be removed from the unit. 4. Reattach the power adapter and insert the battery.
Console Tips 8. T R O U B L E S H O O T I N G G U I D E While the Weather Monitor II is designed to provide years of trouble-free operation, occasional problems may arise. If you are having a problem with your unit, please check the following guide before sending the unit in for repair. You will be able to solve many of the problems yourself. If, after checking this guide, you are unable to solve the problem, please call the factory at 1-510-7327814 for further instructions.
Troubleshooting Guide Display "locks up" • Insufficient power during power up or a power surge may cause the console to lock up. If this occurs, remove all power—disconnect any battery backup and the AC/DC power cord. Wait for 1 minute with all of the power removed. Then, while the battery is removed, reconnect the AC power cord and listen for 2 beeps within 10 seconds.
Humidity Tips H UMIDITY T IPS Inside humidity seems too high or low • Make sure the console is not near a humidifier or de-humidifier. • Check calibration number and adjust if necessary. W IND T IPS Wind speed reading seems lower than expected • Check installation by spinning wing cups. If you get a reading, the wind cups are installed correctly. Wind speed reads 0 either all the time or intermittently • Make sure anemometer cable is plugged into jack marked WIND on junction box.
Warranty and Repairs 9. WARRANTY AND REPAIRS O NE Y EAR L IMITED W ARRANTY For details on Davis’ warranty policy, please refer to the Maintenance, Service, and Repair Information brochure included with your station. Q UESTIONS ? C ALL THE D AVIS S ERVICE C ENTER If you have any questions about our products, please call our Service Center at 1-510-732-7814. We'll be glad to help. Most questions can be answered while you're on the phone. Sorry, we’re unable to accept collect calls.
Specifications S PECIFICATIONS Inside Temperature Range: -5˚ to 140˚ F (-20˚ to 60˚ C) Accuracy: ± 1˚F (± 0.5˚C) Outside Temperature Range: -50˚ to 140˚ F (-45˚ to 60˚ C) Accuracy: ± 1˚F (± 0.5˚C) Wind Direction Display Resolution: 16 points (22.
3465 Diablo Avenue, Hayward, CA 94545-2778 510-732-9229 • Fax: 510-732-9188 E-mail: info@davisnet.com • www.davisnet.
