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- Page 1 4250 Racing Weather Tracker with Backlight In a hurry? Be sure to read pages 5-7 to ensure that your Kestrel is setup properly! Instruction Manual for Kestrel 4250 Racing Weather Tracker www.kestrelweather.com 800.784.4221 Revised 09/07 Revised 07/29/10...
- Page 2 Kestrel 4250 Racing Weather Tracker ® ® TEMPERATURE SENSOR IMPELLER Zytec™ Hermetically sealed precision V-bearings on a user- thermistor coiled to isolate replaceable impeller. from case temperature. IMPELLER COVER Swivel HUMIDITY SENSOR Capacitive cover protects impeller MANUAL MEMORY sensor with secondary when not in use.
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Page 3: Table Of Contents
NK, manufacturer of Kestrel Pocket Weather Meters, is available to answer questions The first time that you turn on your Kestrel Meter, as well as after a battery change, you will need to set the and provide support. Contact NK by phone: 610.447.1555, fax: 610.447.1577, email: date and time. -
Page 4: Navigation
2 default User Screens and the Date/Time Screen. Any of these screens can be turned off so that you can customize your The Kestrel 4250 is capable of storing up to 2000 data points for each measurement. To review the data, press Density Altitude Kestrel Meter to show the screens that your application requires. -
Page 5: Special Functions
Max/Avg for Wind Speed & Wind Chill The Kestrel Meter is capable of measuring RH to a high accuracy: +/– 3% RH between 5 and 95%. To ensure The Max/Avg values for the wind speed and wind chill values are measured independently from the stored operation within these specifications, please follow these recommendations: and charted data. - Page 6 In order to provide meaningful readings for activities where altitude changes quickly, the Kestrel Meter features rapid altitude response. This is why the altitude readings tend to fluctuate by a few feet.) After obtaining a current altitude from the ALTITUDE screen, move to the BARO screen and enter Station Pressure, Barometric Pressure and Altitude Adjustment this value as your reference altitude by following the same procedure.
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Page 7: Main Setup Menu
Custom settings and data will be stored when the batteries are removed. every airfield by entering the field’s “altimeter setting” or reference pressure. Accordingly, if accurate altitude readings are your primary interest, you should reset the reference pressure on your Kestrel Meter regularly. Memory Options If you encounter an elevation landmark, you can adjust the reference pressure until the altitude matches the These settings control the data storage properties. - Page 8 Graph Scale Moisture (Water Grains) grains per pound These settings control the chart limits of your Kestrel Meter. Depending on the conditions, the lower and g/kg grams per kilogram upper limits of the chart scale may need to be adjusted in order to get the best view of the data. Highlight...
- Page 9 Kestrel 4250 Racing Weather Tracker ® ® User Screens Pressure Adjustment section for instructions). Then adjust the calibrating setting on the Baro Cal screen to The three User Screens can be reconfigured to display the most appropriate information for your the known mean sea level barometric pressure.
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Page 10: Application Examples
Kestrel 4250 Racing Weather Tracker ® ® APPLICATION EXAMPLES This section provides examples of applications where a Kestrel Racing Meter might be used, and the appropriate memory settings. Weather Monitoring for Race Weekend Auto Store MEMORY CAPABILITIES Store Rate 1/2 hr... -
Page 11: Glossary
The ratio between the actual mass of water vapor present in moist air — to the mass of the dry air. The distance above sea level. The Kestrel Meter calculates altitude based on the measured station pressure and the input barometric pressure — or “reference pressure”. -
Page 12: Default Settings
The cooling effect of combining wind and temperature. The wind chill gives a more accurate reading of SETTING FACTORY DEFAULT how cold it really feels to the human body. The Kestrel Meter’s wind chill is based on the National Weather Automatic Data Store On Service standards as of November 1, 2001. -
Page 13: Frequently Asked Questions
Think again. Why is it important to know the weather conditions, and how can the Kestrel 4250 help me win races? Weather affects your performance. Period. If you are not using something to measure the weather conditions Even slight changes in air density, water grains, and density altitude can dramatically affect a machine’s... - Page 14 Why doesn’t my Kestrel Meter match the local Weather Report? on the sides of the impeller), and turn the unit on to the wind speed screen. Hold the Kestrel Meter near a Obtaining a weather report from a local television station, airport or internet site will give you the weather television, computer monitor or some electronic device and it will display a wind speed.
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Page 15: Customer Service
(which you may decline receiving). If you do not register and cannot your Kestrel meter in the first 30 days, you may return it to your place of purchase for a full refund. provide proof of purchase, your warranty period will be measured from our date of manufacture, deter- mined by serial number. - Page 16 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 the age or...
- Page 17 Kestrel 4250 Racing Weather Tracker ® ® Kestrel® Pocket Weather® Meters are designed and manufactured in the USA by: NIELSEN-KELLERMAN 21 Creek Circle, Boothwyn, PA 19061 Phone: (610) 447-1555 Fax: (610) 447-1577 Web: www.kestrelweather.com Email: kestrel@nkhome.com PleaseregisteryourKestrelMeteratwww.KestrelWeather.com...
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