3500 Delta T Pocket Weather ®Meter
Contents
1. modifications or attempted repairs by someone other than an authorized NK repair agent impeller failure not caused by a manufacturing defect normal wear from use of the product failed batteries and re calibration beyond 30 days from your date of purchase Your warranty period will be measured from your date of purchase The best way to ensure full warranty coverage is to REGISTER your NK product promptly on our website www kestrelweather com We keep your registration information strictly confidential and do not sell it share it or use it for anything but product related information bulletins which you may decline receiving If you do not register and cannot provide proof of purchase your warranty period will be measured from our date of manufacture determined by serial number We request that you contact NK if you feel your product is not working properly We can often solve product issues by phone or e mail saving you the time and expense of returning the unit If we require the product to be returned we will issue a Return Authorization to expedite the handling of your warranty claim The Kestrel Pocket Weather Meters are covered by the following patents 5 783 753 5 939 645 6 257 074 and 7 059 170 LIFETIME CUSTOMER CARE WARRANTY NK wants you to be an NK customer for life so we take care of you even beyond the terms of the above warranty with our Customer Care Program Trade in any Kestrel Pocket Weather Meter no matter th2. and as long after as component availability permits If we can t repair a product we will offer you a brand new replacement under our Customer Care Program even for accidental damage and misuse Register your Kestrel Pocket Weather Meter online at www kestrelweather com NIELSEN KELLERMAN 21 Creek Circle Boothwyn PA 19061 Phone 610 447 1555 Fax 610 447 1577 Web www kestrelweather com Email kestrel nkhome com 14 ADDITIONAL INFORMATION What is a Kestrel The American Kestrel is the smallest North American falcon Beautiful and highly adaptable it can be found virtually everywhere in North America It is unique among falcons for its ability to both hover at very low speeds and dive at very high speeds A Da Addsil lt mia lp ar ia N N Assembled in the USA The Kestrel 3500 Delta T is protected by US Patent 5 783 753 5 939 645 and 6 257 079 Nielsen Kellerman reserves the right to change product specifications 2007 Kestrel the Kestrel logo Pocket Wind NK and the NK logo are trademarks of the Nielsen Kellerman Co
3. hold the unit into the wind or wave the unit side to side for 15 seconds Readings should be taken in the shade Water and snow temperatures can be taken by hold the unit in the water or snow Relative Humidity amount of moisture in the air compared to the amount of moisture the air can hold for the given temperature represented as a percent Because relative humidity is also a function of the temperature the response time will be dependent on the temperature response time see temperature section above Readings should be taken in the shade First you will need to obtain either a the current barometric pressure or b the altitude of your location You can obtain your current barometric pressure by contacting a local airport or weather service Set this value as your reference pressure on the ALTITUDE screen to determine your altitude Otherwise you can obtain your altitude from a topographic map or local landmark Set this value as your reference altitude on the BAROMETRIC PRESSURE screen to determine your barometric pressure There are two examples for when and how to use the BAROMETRIC PRESSURE and ALTITUDE screens First assume that you know the altitude from one of the sources above Set the reference altitude on the BAROMETRIC PRESSURE screen to this elevation As long as you remain at home you can accurately track changes in the barometric pressure However the measurement on the ALTITUDE screen also changes This value will flu
4. Kestrel 3500 Delta T Pocket Weather Meter with Backlight Thank you for purchasing the Kestrel 3500 Pocket Weather Meter This instrument will measure the following environmental conditions e wind speed delta T e maximum wind gust e dewpoint average wind speed e wet bulb temperature e temperature air water snow e barometric pressure e relative humidity altitude Plus additional features e clock 3 hour pressure trend e data hold function e backlight e automatic power down function INSTRUCTION MANUAL Revised 05 08 3 Mode Hint Icon Units of Measure Humidity r h Delta T dELt l C F Dewpoint d P kN C F Wet Bulb Temp bulb l C F Barometric Pressure bAro te hPa inHg Altitude Alt m ft Only one of the pressure icons will be displayed indicating the 3 hour pressure trend ft pressure rising quickly rise more than 0 18 inHg pressure rising rise within 0 06 inHg and 0 18 inHg pressure stable remain within 0 06 and 0 06 inHg a pressure falling drop within 0 06 inHg and 0 18 inHg pressure falling quickly drop more than 0 18 inHg Hold mode While holding press to hold the time and all of the measured values The word HOLD will blink to indicate the Hold Mode Press J or D3 to view the other measurements in Hold Mode While holding press to exit the Hold Mode This mode can be useful for taking measurements when unable to view the display 2 OPERA
5. TION 1 Slide off cover 2 Turn on Press the center button to turn on the unit 3 Select operating mode Press the right arrow D3 to scroll through the measurements listed below Press the left arrow J to scroll through the measurements in reverse order The instantaneous measurements will be displayed Each measurement screen is preceded by a brief hint to clarify which measurement is being displayed See Understanding the Measurements section for more information 4 Select the unit of measure While holding press D to scroll through the units of measure listed below Mode Hint Icon Units of Measure Clock 12 hr 24 hr Wind Speed SPd m s ft min km h mph kt B Max Gust SPd MAX m s ft min km h mph kt B Avg Speed SPd AVG m s ft min km h mph kt B Temperature dEG C F 6 Turn on the backlight Press to activate the backlight for 10 seconds If or Q are pressed while the backlight is illuminated the backlight will remain illuminated for another 10 seconds Press while the backlight is illuminated to manually turn off the backlight 7 Adjust the clock Simultaneously press and D3 to adjust the clock While the clock is blinking press amp J or D3 to adjust the clock Hold amp J or to adjust the times quickly Simultaneously press and D3 to exit the clock adjustment 8 Adjust the reference altitude Obtain your altitude from a topographic map or landmark to use as
6. assembly When inserting the new impeller be sure the arrow is facing the display side of the unit and is aligned with the top of the meter Press on the sides of the housing rather than Replacing the Impeller the center 11 BEAUFORT SCALE lt a Description The Beaufort Scale is a system for estimating 0 Calm wind force without the use of instruments based 1 Light Air on the visible effects of the wind on the physical 2 Light Breeze environment The behavior of smoke waves trees 3 Gentle Breeze etc is rated on a 13 point scale The scale was K Moderate Breeze devised in 1805 by the British naval Commander aa ance Sir Francis Beaufort 1774 1857 and is still 4 Near a commonly used by mariners 8 Gale Strong Gale KESTREL POCKET WEATHER METERS omi Violent Storm Hurricane WARRANTY NK does not believe in disposable electronics We know that Kestrel Meters don t typically lead pampered lives and we design them for years of performance in tough conditions Every Kestrel is designed and manufactured at NK s facility in Boothwyn PA We guarantee every Kestrel Pocket Weather Meter to be free of defects in materials and workmanship for a period of FIVE YEARS from your date of purchase We will repair or replace any defective product or part when notified within the warranty period and will return the product via domestic ground shipping at no charge Additionally each Kestrel has a 30 day money back guarantee The f
7. ctuate as pressure fronts pass through your location Since you know your house in not changing elevation you can ignore this screen Now let s assume that you are planning a day hike and you d like to track your altitude Before starting you ll need to adjust the reference pressure on the ALTITUDE screen You can do this by simply adjusting the reference pressure until you reach the elevation of your house The reference pressure will be the same as the pressure reading on the BAROMETRIC PRESSURE screen You can now track the altitude as you hike You can ignore the values on the BAROMETRIC PRESSURE screen since the pressure changes are predominantly due to changes in elevation 2 Dewpoint calculated based on temperature and humidity measurements as a measure of moisture content in the air If the dewpoint is very close to the temperature the air is humid If the temperature and dewpoint are the same dew will form If this happens below freezing frost will form Wet Bulb Temperature calculated based on temperature and humidity measurements as a measure of evaporation rate If the wet bulb temperature is very close to the air temperature the air is humid Wet bulb temperature is typically measured by swinging a mercury thermometer with a wet sock on its end for several minutes Delta T calculation of the dry bulb temperature minus the wet bulb temperature as a measure of evaporation rate Primarily used in spraying applications t
8. d through the large opening in the over and out the slot Replace the poplock on the lanyard Replacing the Battery When your display becomes dim or disappears replace the battery Use a large coin to open the battery compartment Use only new CR2032 coin cell batteries available where Replacing the Battery watch batteries are sold Wipe the battery clean of any fingerprints and insert the positive pole up angling the battery downward and pressing it firmly into place When replacing the battery door be sure to keep the black rubber o ring seated in the groove on the case back Why does the Impeller Appear Imbalanced It is NORMAL for the impeller to oscillate as it comes to a stop It is NOT imbalanced Rather it contains a very small magnet that responds to the earth s magnetic fields This does not affect the accuracy of the wind speed readings because the magnetic field applies both a braking and an accelerating force which cancel each other The impeller has been calibrated to provide wind speed readings accurate to within at least 3 High Speed Use After several hours of sustained operation over 25 M S 49 KT 90 KM H 56 MPH or 4 923 FPM the Kestrel will lose some accuracy due to wear of the sapphire bearings in the impeller Replacing the Impeller You may recalibrate the wind speed readings by replacing the impeller Press FIRMLY on the sides of the black impeller housing with your thumbs to remove the entire
9. e age or condition and receive a generous discount on the replacement 13 product same model only Our Customer Care Program applies only as long as we manufacture the product and does not cover product upgrades CALIBRATIONS CERTIFICATIONS AND SERVICE Every NK product is tested and calibrated before it leaves our factory We guarantee that it will perform within specifications when you receive it Each Kestrel comes with a Certificate of Conformity with the stated specifications for that product on the back If you feel an NK product is not meeting specs when you receive it call us and we ll make sure you are operating it correctly If it still appears that it may be out of spec return it to us within 30 days of purchase and we will test and recalibrate all values at no charge Beyond 30 days we offer reasonably priced tests calibration services and N I S T certified calibrations as well as Kestrel tune ups All of our measurements are traceable to the National Institute of Standards and Technology ensuring the highest level of accuracy Our primary Calibration Standards are sent for calibration in accordance with N I S T requirements and based on a regular schedule Only approved laboratories and N I S T themselves are used for these calibration services Incoming and outgoing data is supplied with the certificate of calibration We also offer full factory service on every product we manufacture for as long as we make the product
10. his measure provides an indication of droplet survival For example it is not recommended to apply pesticides when Delta T is above 10 A range of 2 to 8 degrees C is ideal The Kestrel 3500 Delta T uses a pressure corrected wet bulb temperature ensuring accuracy in all conditions Altitude and Barometric Pressure the Kestrel 3500 will measure station pressure in order to calculate barometric pressure and altitude Changes in either air pressure or altitude will affect these readings so it s important to make adjustments as necessary 8 As with all pressure altimeters it must be assumed that any change in pressure due to weather is small over the course of one day If you were to encounter an elevation landmark you can adjust the reference pressure until the altitude matches the landmark elevation This will correct the altitude for any pressure changes due to weather MAINTENANCE amp TROUBLESHOOTING Environmental Every Kestrel Meter is fully waterproof and floats and has passed mil spec drop testing Storing Your Kestrel Avoid storing your Kestrel where it will be exposed to temperatures below 30 C 22 F or above 60 C 176 F for extended periods of time Doing so may cause permanent damage Note that the inside of a car parked in the hot sun can reach very high temperatures Use of the Lanyard and Cover The cover can be captured on the lanyard to avoid loss First remove the cord poplock Then feed the lanyard en
11. ollowing issues do not result from a manufacturing defect and are not covered under this warranty damage due to improper use or neglect including corrosion impact damage 10 Taking Accurate Humidity and Dewpoint Measurements The patented system for measuring relative humidity allows for extremely fast and accurate readings The sensor is located in the large hole on the rear of the unit Even extreme and abrupt changes in the surrounding humidity will be measured within several minutes To test this place your hand around the rear of the unit Within several seconds the humidity will increase dramatically After removing your hand the humidity will quickly begin to decrease Next place your hand near the rear of the unit and wave the unit back and forth The humidity will not change because the air flow is diluting the humidity from your hand This example shows the importance of keeping air flow past the sensor while taking a measurement If there is no natural air flow past the sensor wave the unit back and forth It is also reasonable to lay the unit down on a solid surface for several minutes to allow the sensor to adjust Sensor Calibration All the sensors have been factory calibrated to be accurate within specifications For recalibration you may either return it to Nielsen Kellerman for factory calibration or contact NK for field calibration instructions Humidity Field Calibration Kits are also available for sale online 12
12. your reference altitude From the barometric pressure screen simultaneously press and D buttons to adjust the reference altitude Press amp J or to adjust the reference altitude or hold amp J or to adjust the value quickly Simultaneously press and D3 to exit the reference altitude adjustment 9 Adjust the reference pressure Obtain your barometric pressure reading from a local weather source to use as your reference pressure From the altitude screen simultaneously press amp and D buttons to adjust the reference pressure Press or D to adjust the reference pressure or hold or to adjust the value quickly Simultaneously press and D3 to exit the reference pressure adjustment 10 Turn off Hold for 2 seconds to manually turn off the unit The unit will automatically turn off if no buttons have been pressed for 45 minutes UNDERSTANDING THE MEASUREMENTS Wind Speed average over the previous three seconds The measurement will be accurate for air flow through the front or rear of the unit Maximum Wind Gust maximum 3 second wind speed since the unit was turned on Average Wind Speed average wind speed since the unit was turned on Temperature instantaneous temperature of the thermistor which is located at the end of the long coiled leads in the open cavity below the impeller The exposed thermistor will respond quickly to changes in temperature when air flows past it For fastest response either
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