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HVAC - Environmental Monitoring
Auto Store
On
Store Rate 5 min
Overwrite On
Man Store Off
These settings will record conditions every five minutes, for a total storage of almost 2 days. You can monitor the
conditions in a laboratory or manufacturing plant, both day and night, to determine if the climate control is
working properly. Or you can examine the effect on the environment when employees enter and exit the
building.
HVAC/R - System Balancing
Auto Store Off
Store Rate —
Overwrite Off
Man Store On
These settings will require you to press the Manual Store Button in order to store any data at a duct, hood, vent,
or other air system. The meter will not store any data automatically. Be sure to record the location and date/time
of storage for reference when reviewing the data. After storing the conditions at each location, simply review
the data and balance the system.
The below definitions have been greatly simplified in order to keep this section brief. We strongly recommend
that anyone who wishes to make use of these measurements refer to one of the many excellent weather
references available for a more in-depth definition. On the internet, visit www.usatoday.com or www.noaa.gov.
Or, locate the USA Today publication, The Weather Book. Please note that any words in a definition printed in
italics are themselves defined in this glossary.
Altimeter Setting: An aviation term for the local barometric pressure. Same as reference pressure.
Altitude: The distance above sea level. The Kestrel 4500 calculates altitude based on the measured station
pressure and the input barometric pressure - or "reference pressure" .
Barometric Pressure: The air pressure of your location reduced to sea level. Pressure will change as weather
systems move into your location. Falling pressure indicates the arrival of a low pressure system and expected
precipitation or storm conditions. Steady or rising pressure indicates clear weather. A correct altitude must be
input for the Kestrel to display barometric pressure correctly.
Density Altitude: The altitude at which you would be, given the current air density. Often used by pilots in order
to determine how an aircraft will perform. Also of interest to individuals who tune high performance internal
combustion engines, such as race care engines.
Dewpoint: The temperature to which air must be cooled in order for condensation to occur. The difference
between dewpoint and temperature is referred to as the "temperature/dew point spread" . A low dewpoint
spread indicates high relative humidity, while a large dewpoint spread indicates dry conditions.
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 our ability to cool ourselves 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.
Store Rate
Total Memory
2 sec
59 min, 44 sec
5 sec
2 hr, 2 min, 20 sec
10 sec
4 hr, 58 min, 40 sec
20 sec
9 hr, 57 min, 20 sec
30 sec
14 hr, 56 min
1 min
1 day, 5 hr, 52 min
2 min
2 days, 11 hr, 44 min
5 min
6 days, 5 hr, 20 min
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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 wind chill is based on the National Weather Service
standards as of November 1, 2001.
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Store Rate
Total Memory
10 min
12 days, 10 hr, 40 min
20 min
24 days, 21 hr, 20 min
30 min
37 days, 8 hr
1 hr
74 days, 16 hr
2 hr
149 days, 8 hr
5 hr
373 days, 8 hr
12 hr
896 days
18
20
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