Kestrel 2500 Weather Meter Sensor Specifications

Sensor Specifications

Wind Speed
Selections:	mph \| kt \| B \| m/s \| ft/min / km/h
Specification Range:	0.6 to 40.0 m/s 118 to 7,874 ft/min 2.2 to 144.0 km/h 1.3 to 89.5 mph 1.2 to 77.8 knots 0 to 12 B* 2-131.2 F/S*
Operational Range:	0.6 to 60.0 m/s 118 to 11,811 ft/min 2.2 to 216.0 km/h 1.3 to 134.2 mph 1.2 to 116.6 knots 0 to 12 B* 2-196.9 F/S*
Resolution:	0.1 m/s 1 ft/min 0.1 km/h 0.1 mph 0.1 knots 1 B
Accuracy (+/-):	Larger of 3% of reading, least significant digit or 20 ft/min
Notes:	1 inch\|25 mm diameter impeller with precision axle and low-friction Zytel® bearings. Startup speed stated as lower limit, readings may be taken down to 0.4 m/s \| 79 ft/min \| 1.5 km/h \| .9 mph \| .8 kt after impeller startup. Off-axis accuracy -1% @ 5º off-axis; -2% @ 10º; -3% @ 15º. Calibration drift < 1% after 100 hours use at 16 MPH \| 7 m/s. Replacement impeller (PN-0801) field installs without tools (US Patent 5,783,753). Wind speed calibration and testing should be done with triangle on impeller located at the top front face of the Kestrel. *F/S only in Ballistics units. Beaufort not available in Ballistics units.
Ambient Temperature
Selections:	Fahrenheit, Celsius
Specification Range:	-20.0 to 158.0 °F -29.0 to 70.0 °C
Operational Range:	14.0.0 to 131.0 °F -10.0 to 55.0 °C
Resolution:	0.1 °F 0.1 °C
Accuracy (+/-):	0.9 °F 0.5 °C
Notes:	Hermetically sealed, precision thermistor mounted externally and thermally isolated (US Patent 5,939,645) for rapid response. Airflow of 2.2 mph\|1 m/s or greater provides fastest response and reduction of insolation effect. Calibration drift negligible. Thermistor may also be used to measure temperature of water or snow by submerging thermistor portion into material -- remove impeller prior to taking submerged measurements and ensure humidity sensor membrane is free of liquid water prior to taking humidity-based measurements after submersion.
Pressure
Selections:	inHg, hPA, mb
Specification Range:	25°C/ 77°F 750-1100 hPa\|mbar 22.15-32.48 inHg 10.88-15.95 PS
Operational Range:	0.30 to 48.87 inHg 10.0 to 1654.7 hPa\|mbar 0.14 to 24.00 PSI 14.0 to 131.0 °F -10.0 to 55.0 °C
Resolution:	0.1 hPa\|mbar 0.01 inHg 0.01 PSI
Accuracy (+/-):	1.5 hPa\|mbar 0.044 inHg 0.022 PSI
Notes:	Monolithic silicon piezo-resistive pressure sensor with second-order temperature correction. Between 1100–1600 mbar, unit will operate with reduced accuracy. Sensor may not operate above 1600 mbar and can be damaged above 6,000 mbar or below 10 mbar. Calibration drift is negligible for the life of the product.

Calculated Measurements

Wind Chill
Accuracy (+/-):	1.6 °F 0.9 °C
Resolution:	0.1 °F 0.1 °C
Sensors employed:	Wind Speed Temperature
Barometric Pressure
Accuracy (+/-):	0.07 inHg 2.4 hPa\|mbar 0.03 PSI
Resolution:	0.01 inHg 0.1 hPa\|mbar 0.01 PSI
Sensors employed:	Pressure User Input (Reference Altitude)
Altitude
Accuracy (+/-):	typical: 23.6 ft/7.2 m from 750 to 1100 mBar max: 48.2 ft/14.7 m from 300 to 750 mBar
Resolution:	1ft 1m
Sensors employed:	Pressure User Input (Reference Pressure)

Downloads:

Kestrel 2500 Manual and Complete Sensor Specifications

Kestrel 2500 Weather Meter Sensor Specifications

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