Rev’d 9/23/04
Sensors
Impeller: 25 mm. [1 in.] diameter, sapphire bearings, light weight. User-replaceable
impeller/housing assembly.
Temperature Sensor: Hermetically sealed precision thermistor.
Humidity Sensor: Capacitive sensor.
Pressure Sensor: Monolithic Silicon Piezoresisitive sensor.
Display
Type: Reflective 4.5 digit LCD.
Digit Height: 8 mm. [0.31 in.].
Update: 1 second.
Temperature Limitations: Normal operation from -15°C to 50°C [5°F to 122°F]. Below
-15°C [5°F] the display fluid will freeze. Above 50°C, the display will turn black. This is
temporary and display will function properly when unit is returned to normal temps.
Accurate readings may be taken by keeping the unit warmer than -15°C [5°F], or
cooler than 50°C [122°F] and exposing it for the minimum time necessary to take a
reading (less than one minute).
Auto Shutdown: After 45 minutes of no button presses.
Environmental
Sealing: Electronics enclosure IP67 – water resistant to 1 m. [3 ft.]. Floats.
Shock: Drop tested to 2 m. [6 ft.].
Storage Temperature: -30°C to 80°C [-22°F to 176°F].
Physical
Buttons: Three sealed tactile rubber buttons control all functions.
Battery: User-replaceable CR2032 coin cell. Typical life, 300 hours.
Impeller: 25 mm. [1 in.] diameter, sapphire bearings, light weight. User-replaceable
impeller/housing assembly.
Case: Slip-on case prevents damage to display and moving parts.
Dimensions: Unit: 4.8 x 1.7 x 0.7 in [122 x 42 x 18 mm]; case: 4.8 x 1.9 x 1.1
(122 x 48 x 28 mm].
Weight: Unit 2.3 oz [65g]; case 1.3 oz [37 g].
For more information or more detailed specifications, please visit www.nkhome.com.
Force Description Kts
0 Calm 0
1 Light Air 1-3
2 Light Breeze 4-6
3 Gentle Breeze 7-10
4 Moderate Breeze 11-16
5 Fresh Breeze 17-21
6 Strong Breeze 22-27
7 Near Gale 28-33
8 Gale 34-40
9 Strong Gale 41-47
1 0 Storm 4 8- 55
11 Violent Storm 56-63
12+ Hurricane 64+
Why does the Impeller Appear Imbalanced?
It is NORMAL for the impeller to oscillate as it comes to a stop. It is NOT improperly balanced.
Rather, it contains a very small magnet which 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
Press FIRMLY on the sides of the black impeller housing with your thumbs to remove
the entire 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 the center.
Taking Accurate Humidity, Heat Stress 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.
BEAUFORT SCALE
The Beaufort Scale is a system for estimating wind force
without the use of instruments based on the visible effects
of the wind on the physical environment. The behavior of
smoke, waves, trees, etc., is rated on a 13 point scale. The
scale was devised in 1805 by the British naval Commander
Sir Francis Beaufort (1774-1857) and is still commonly used
by mariners.
WARRANTY & SERVICE
Warranty
Every unit is fully tested at our factory for measurement accuracy and waterproof integrity.
Your Kestrel is covered by a full parts and labor warranty for two years from your date
of purchase. The provisions of this warranty do not apply to: a) batteries, whether
contained in a unit or sold individually; b) units which have been subjected to misuse,
negligence, accident or improper maintenance or application; c) humidity sensors
damaged by excess contact with salt water; or d) units which have been repaired or
altered by a party other than Nielsen-Kellerman’s employees or agents without Nielsen-
Kellerman’s prior written consent.
Parts and Service
To order replacement parts for your Kestrel or obtain service please contact Nielsen-
Kellerman or your original place of purchase.
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.
Assembled in the USA. The Kestrel 3500 is protected by US Patents
5,783,753, 5,939,645 and 6,257,079. Other patents pending. Nielsen-
Kellerman reserves the right to change product specifications. © 2004.
Kestrel, the Kestrel logo, Pocket Weather, NK and the NK logo are
trademarks of the Nielsen-Kellerman Co.
AVERAGE HOUSEHOLD INCOME: <$25,000 $26,000-45,000
46,000-75,000 $76,000-100,000 $100,000+
WHERE DID YOU PURCHASE YOUR KESTREL?
HOW DID YOU LEARN ABOUT KESTREL POCKET WEATHER METERS?
PRIMARY USE (CAMPING, FIRE FIGHTING, AGRICULTURE, ETC.):
SECONDARY USE:
FAVORITE MAGAZINE:
NAME:
ADDRESS:
CITY: STATE: ZIP:
COUNTRY: TELEPHONE NUMBER:
EMAIL ADDRESS:
SERIAL NUMBER: DATE OF PURCHASE:
MODEL: 1000 2000 3000 4000
MALE: FEMALE:
AGE: 18-24 25-36 37-48 49-56 57+
Please fill out the product registration below and mail it to: Kestrel Registration, 21 Creek Circle, Boothwyn, PA 19061.
NIELSEN
-
KELLERMAN
21 Creek Circle, Boothwyn, PA 19061 USA
Phone (610) 447-1555 • Fax (610) 447-1577
Web www.nkhome.com
E-mail kestrel@nkhome.com
SPECIFICATIONS
Accuracy (Within OPERATIONAL RANGE at right)
Wind Speed ±3% of reading
Temperature ±1°C
Wind Chill ±2°C
Wet Bulb Temp ±2°C
Dewpoint ±3°C (above 20% RH)
Heat Index ±3°C
Relative Humidity ±3%
Pressure ±3hPa
Altitude ±30m (at standard atmospheric conditions)
Altitude Resolution 1m
Response Time
Wind Speed, Pressure, Altitude 1 Second
Temperature, Relative Humidity <1 Minute
Wind Chill, Heat Index, under most conditions.
Dewpoint, Wet Bulb
Operational Range
Units of Measure Low High
Knots 0.6 78
Meters per Second 0.3 40
Kilometers per Hour 1.0 144
Miles per Hour 0.7 89
Feet per Minute 59 7877
Beaufort Force 1 16
Celsius -29 70
Fahrenheit -20 158
Percent Humidity 5 95
Meters -500 9000
Feet -1500 30000
Hectopascal (or mbar) 870.0 1080.0
Inches Mercury 25.70 31.90
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