Kestrel 4300 (Construction) - Manual (Page 14)

Kestrel ® 4300 Construction Weather Tracker 27
Heat Index
A practical measure of how hot the current combination of relative humidity and temperature feels to a
human body. Higher relative humidity makes it seem hotter because the body’s ability to cool itself by
evaporating perspiration is reduced.
Reference Pressure
The local barometric pressure. Input to the altitude screen to provide correct altitude readings. Also known
as the altimeter setting.
Relative Humidity
The amount of water vapor actually in the air divided by the maximum amount of water vapor the air could
hold at that temperature, expressed as a percentage.
Station Pressure
The air pressure of your location, NOT reduced to the sea level equivalent.
Temperature
The ambient air temperature.
Wet Bulb Temperature
The lowest temperature to which a thermometer can be cooled by evaporating water into the air at constant
pressure. This measurement is a holdover from the use of an instrument called a sling psychrometer. To
measure wet bulb temperature with a sling psychrometer, a thermometer with a wet cloth covering over
the bulb is spun rapidly through the air. If the relative humidity is high, there will be little evaporative
cooling and the wet bulb temperature will be quite close to the ambient temperature. Some exercise
physiology guides use wet bulb temperature, rather than heat index, as a measure of the safety of exercise in
hot and humid conditions.
Wind Chill
The cooling effect of combining wind and temperature. The wind chill gives a more accurate reading of
how cold it really feels to the human body. The Kestrel Meter’s wind chill is based on the National Weather
Service standards as of November 1, 2001.
DEFAULT SETTINGS
UNIT METRIC IMPERIAL
Wind Functions M/s mph
Temperature Functions °C °F
Barometric Pressure hPa inHg
Altitude Functions M Ft
Time Format 24 hour 12 hour
Date Format Day/month/year Month/day/year
SETTING FACTORY DEFAULT
Automatic Data Store On
Data Store Rate 1 hour
Data Overwrite On
Manual Data Store On
User Screen 1 Wind speed, temperature, humidity
User Screen 2 Humidity, dewpoint, wet bulb
User Screen 3 Pressure, altitude, density altitude
Display Contrast 10
Automatic Shutdown 15 minutes
Language English
PC Upload
Stored data may be uploaded to a PC with the optional Kestrel Interface.