Description

Large liquid crystal display which is easy to read under almost any conditions.
Track maximum and average wind speeds along with current readings.
Three operating modes: wind speed, average wind speed, and maximum wind speed.
Temperature and wind chill can be displayed in °C or °F.
The display units can be changed at any time, with choices to suit a wide variety of applications (knots, meters per second, kilometers per hour, miles per hour, feet per minute, or Beaufort scale).
All functions are controlled with only two buttons.
A precision ultra-light impeller mounted in jewel bearings measures wind speed.
This impeller yields high accuracy (± 3%) and a low startup speed (0.3 M/S).
For temperature readings, the Kestrel uses a fast-responding thermistor accurate to +/-1° C.
Wind chill is calculated from wind and temperature data using the U.S. National Weather Service’s official tables.
Shock-mounted in a glass reinforced plastic housing which can simply be popped out and replaced with a new assembly in the event that the impeller mechanism becomes worn or damaged.
The Kestrel is waterproof and floats.
The hard case slips on and off easily, protecting the display and all moving parts from damage.
Performance is guaranteed for one full year.
US Patent Nos. 5,783,753 and 5,939,645.

Performance Specifications

On-axis Accuracy: +/-3% of reading or +/-least significant digit, whichever is greater.
Off-axis Response: -1% @ 5°, -2% @ 10°, -3% @ 15°.
Calibration Drift: <2% after 100 hours operation at 7 M/S.
Minimum Speed: 0.3 M/S (~0.6 KT, 1KM/H, 0.7 MPH, 60 FPM).
Maximum Speed: 40 M/S (~78 KT, 144 KM/H, 89 MPH, 7830 FPM). Some loss of accuracy from bearing wear may occur with sustained operation over 25 M/S.
Temperature, wind chill: update: 1 second.
Accuracy: +/-0.1° C temperature, +/-0.1° C wind chill.

Additional Description

Display Specifications

Operating Modes: Moving three second average (wind speed), average since power-on (AV) or maximum three second gust since power-on (MAX).
Type: Reflective LCD.
Digit Height: 0.36” (9 mm).
Update: 1 second.
Range: 0.0 to 19.9, 20 to 199.
Units: Knots (KT), meters per second (M/S), kilometers per hour (KM/H), miles per hour (MPH) or feet per minute (FPM).

Operation Specifications

Buttons: Two sealed tactile rubber buttons control all functions.
Auto Shutdown: 30 minutes after last key press.
Battery: User-replaceable CR2032 coin cell. Typical life is 400 hours.

Environmental Specifications

Sealing: Electronics enclosure IP67, water resistant to 3’ (1 meter). Unit floats.
Shock: Drop tested to 6’ (2 meters).
Temperature: Operating range: -5° F to 122° F (15° C to 50° C). Storage range: -4° F to 176° F (20° C to 80° C).

Physical Specifications

Impeller: Diameter 1” (25mm). High precision jewel bearings. User replaceable impeller assembly.
Hermetically sealed thermistor.
Case: Slip-on hard case protects display, buttons and impeller.
Dimensions: Unit, 4.8” x 1.7” x 0.6” (122 x 42 x 14 mm); case, 4.6” x 1.8” x 0.7” (117 x 46 x 19 mm); lanyard, 10” (0.5 m).
Weight: Unit, 1.5 ounces (43 grams); case, 0.8 ounces (23 grams).

Temperature Limitations

The Kestrel temperature sensor is able to measure temperatures as low as -30° C (-22° F) and as high as 70° C (158° F). The sensor and electronics won’t measure beyond this range. The Kestrel is able to display wind chill measurements lower than -30° C, depending on wind conditions. It is also able to display heat index measurements above 70° C, depending on humidity conditions. Furthermore, the Kestrel display will not function if the display itself gets below -15° C. However, if the unit is kept in a pack, pocket or other warm area, the temperature of the display itself should not get cold enough for the unit to stop functioning.

Full one-year warranty on entire system covers manufacturing defects.