Kestrel 4600 Heat Stress Meter - Manual (Page 10)

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Replacing the Kestrel impeller
Press only the sides of the impeller when removing and inserting to avoid damaging the precision
hub bearing. ( Figure 1 ) .
• Press FIRMLY on the impeller module to remove it.
• Insert the new impeller so the side that has the small triangle (close to the perimeter)
faces the front of the Kestrel when installed. Orient one “arm” of the module straight up .
( Figure 2 ). The impeller can be pushed in from either side.
IMPELLER REPLACEMENT
Kestrel
Figure 1
Figure 2
In addition to Wind Speed and Wind Chill, the Kestrel 4600 also measures Direction,
Headwind/Tailwind and Crosswind.
Digital Compass Calibration
The digital compass must be calibrated to correct for the AAA batteries’ magnetic field. It must be
re-calibrated every time the battery door is opened, and it will not display or log any direction values until
calibration is complete.
**Impeller should be removed during calibration for best results.
• Remove the impeller by pressing the edges to pop it out (reinsert after calibration
is complete).
• Place the Kestrel meter in the foam stand provided so it remains balanced and vertical
[ Figure 1 ]. You may also hold the Kestrel meter vertically in your hand and turn
your body.
To Calibrate:
• In Main Setup Menu, use
or to highlight “System”, then press .
• Press to highlight “Compass Cal”, then press .
Follow the prompts on screen:
• Press to start.
• Slowly spin the upright meter around three (3) full times.
• Each rotation should take approximately 10 seconds.
• When calibration is finished, the screen will read “Cal Complete”.
• Press to exit to Main Menu.
To verify the digital compass’ accuracy, test it against a compass; the Kestrel meter
readings should be within ±5° of the reference compass or better. If readings appear
incorrect, simply run the calibration routine again.
Calibration Error Messages
There are three error messages that the meter may display during calibration. Press
to exit the error screen and run the calibration again.
• Magnetic Batteries: The magnetic field of the Kestrel’s batteries is interfering with calibra-
tion. Simply open the battery door, rotate one or both batteries, and run the calibration
again.
• Too Slow: The unit was spun too slowly during calibration.
• Too Fast: The unit was spun too quickly during calibration.
COMPASS CALIBRATION ( 4600 ONLY)
3x
Figure 1