Kestrel 4000 User Manual
Page 18
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KESTREL 4250 RACING WEATHER TRACKER:
The Kestrel 4250 will display the actual air pressure,
or Absolute Pressure, of your location on the “Pressure”
screen. If your racing software asks for Station Pressure
or Absolute Pressure, use the data from the Kestrel’s
“Pressure” screen. If it asks for Barometric Pressure and
Altitude, scroll to the Baro or Alt screen and follow the
steps on page 12.
Relative air Density
Relative Air Density is the ratio of measured air density
compared to standard air density and expressed as a
percentage. Standard air density conditions are defined
by the ICAO as 29.92 inHg, 0% relative humidity, and 59
degrees F. The Kestrel 4250 will display this value on the
RAD screen.
Moisture Content
Moisture content is a measure of the relative humidity of
the air, expressed as grains of water per pound of dry air.
This is displayed on the “Moisture” screen.
KESTREL 4200 AIR FLOW ENVIRONmENTAL
mETER:
air Flow Volume & Max/avg for air Flow
In addition to full Kestrel 4000 measurements, the
Kestrel 4200 also measures Volume Air Flow.
Measuring Volume air Flow
The unit will display Air Flow Volume based on instan-
taneous data of Air Velocity and the Dimensions of the
opening through which the air is flowing.
to set opening Dimension & obtain air Flow data:
• Press
while on the Air Flow screen to enter the
“Dimensional Setting” screen.
• Use or to change the “Shape” setting of your
opening to “Round” or “Rectangular”.
• Scroll down then use or to set the size of the open-
ing to the appropriate Diameter or Length and Width.
• Press
to exit the Dimensional Setting screen and
view Air Flow data.
Max/avg for air Flow
Follow the same steps listed to obtain “Max/Avg
Wind Speed & Wind Chill” to acquire this additional
data. The routine will work simultaneously for all 3
measurements, regardless of which one is displayed
when running. No other Min/Max/Avg or stored data
will be affected.
Humidity Ratio
Humidity ratio is a measure of the relative humidity of
the air, expressed as grains of water per pound of dry
air. This is displayed on the “Hum Ratio” screen.
spECIaLtY KEstRELs