Kestrel® 3500DT Pocket Weather® Meter
9
Why does the Impeller Appear Imbalanced?
It is NORMAL for the impeller to oscillate as it comes to a stop. It is NOT imbalanced. Rather,
it contains a very small magnet that 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 Zytec™ V-bearings in
the impeller.
Replacing the Impeller
You may recalibrate the wind speed readings by 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
will correct the altitude for any pressure changes due to weather.
MAINTENANCE & TROUBLESHOOTING
Environmental
Every Kestrel Meter is fully waterproof and floats, and has passed mil-spec drop testing.
Storing Your Kestrel
Avoid storing your Kestrel where it will be exposed to temperatures below -30°C [-22°F] or
above 60° C [176° F] for extended periods of time. Doing so may cause permanent damage.
(Note that the inside of a car parked in the hot sun can reach very high temperatures.)
Use of the Lanyard and Cover
The cover can be captured on the lanyard to avoid loss. First, remove the cord poplock. Then
feed the lanyard end through the large opening in the over and out the slot. Replace the
poplock on the lanyard.
Replacing the Battery
When your display becomes dim or disappears, replace the
battery. Use a large coin to open the battery compartment. Use
only new CR2032 coin cell batteries (available where watch
batteries are sold). Wipe the battery clean of any fingerprints
and insert the positive (+) pole up, angling the battery
downward and pressing it firmly into place. When replacing the
battery door, be sure to keep the black rubber o-ring seated in
the groove on the case back.
Replacing the Battery
Replacing the Impeller
Shop for Kestrel products online at:
1.877.766.5412
www.
WeatherMeters-Direct
.com
