Kestrel 4500 with Wind Direction   |    Ref: NK-4500

It also calculates crosswind and headwind/tailwind with reference to a user-set target heading, and stores the information along with all the other environmental readings in its 2000 data point memory.

Pair the 4500 with the Kestrel Vane Mount (to be released Summer 2007) and you have a data-logging weather station that sets up in seconds and rotates in the slightest of breezes. This system packs down into a 2 x 6 inch pouch and weighs under 8 ounces.

Features and Specifications
Wind Speed
Accuracy	±3%
Response Time	1 second
Calibration Drift	<1% after 100 hours use at 7m/s

Units	Display	Res'n	Range
Knots	KTS	0.1	0.6 to 118.3
Meters per Second	M/S	0.1	0.4 to 60
Kilometers per Hour	KM/H	0.1	1.0 to 218
Miles per Hour	MPH	1	0.8 to 135
Feet per Minute	FPM	1	59 to 7877
Beaufort Force	BEAU	0.1	0 to 12

Wind Direction / Forward Heading

Operational Range	360 degrees
Accuracy	+/- 5 degrees
Specification Range	0 to 360 degrees

Temperature
Accuracy
Temperature	±1°C
Wind Chill	±1°C
Dew Point	±2°C
Heat Index	±2°C
Response Time	1 minute for most conditions

Units	Display	Res'n	Range
Celsius	°C	0.1	-45 to 125
Fahrenheit	°F	0.1	-49 to 257

Relative Humidity
Accuracy	±3%
Response Time	approximately 1 minute for most conditions
Calibration Drift	±2% over 24 months (can be field calibrated)

Units	Display	Res'n	Range
Percent	%	0.1	0 to 100%

Barometric Pressure
Accuracy	±3hPa (between -10°C and 60°C)
Calibration Drift	±1hPa over 12 months (can be field calibrated)

Units	Display	Res'n	Range
hectoPascal (mb)	hPa	0.1	300.0 to 1100.0
Inches Mercury	inHg	0.01	8.86 to 32.48

Altitude, Density Altitude

Units	Display	Res'n	Range
Meters	M	1	-2000 to 9000
Feet	FT	1	-6000 to 30000

Please see manufacturer's barometer and altitude help page for more information.

Display
Update	1 second
Temperature Range	Normal operation from -10°C to 55 °C [14°F to 131°F]. Below -20°C [-4°F], accurate readings may be taken by keeping the unit warmer than -20°C [-4°F] and exposing it for the minimum time necessary to take a reading (less than 1 minute).
Storage Temperature	-30°C to 60°C [-22°F to 140°F].
Auto Shutdown	After 45 minutes of no button presses. (This feature can be disabled.)

Physical
Battery	Two AAA alkaline batteries (included). Typical life, 400 hours.
Impeller	25 mm. [1in.] diameter, sapphire bearings, light weight. User-replaceable impeller/housing assembly.
Temperature Sensor	Hermetically sealed precision thermistor.
Humidity Sensor	Solid state silicon capacitive sensor.
Pressure Sensor	Monolithic silicon piezoresistive sensor.
Dimensions	12.7 x 4.5 x 2.8 cm. [5 x 1.8 x 1.1 in.]
Weight	102 g. [3.6 oz.]
Warranty	Standard 1-year warranty 2nd-year after registration.
The manufactures reserve the right to amend the specification and therefore the information in this document may be subject to change.