Factory Default - Kestrel 4000 Instruction Manual

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.
Store Rate Total Memory
2 sec 1 hr, 6 min, 40 sec
5 sec 2 hr, 46 min, 40 sec
10 sec 5 hr, 33 min, 20 sec
20 sec 11 hr, 6 min, 40 sec
30 sec 16 hr, 30 min
1 min 1 day, 9 hr, 20 min
2 min 2 days, 18 hr, 40 min
5 min 6 days, 22 hr, 40 min
UNIT METRIC
Wind Functions m/s
Temperature Functions °C
Barometric Pressure hPa
Altitude Functions m
Time Format 24 hour
Date Format day/month/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
Stored data may be uploaded to a PC with the optional Kestrel PC Interface, NK part number 0830.
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.
Store Rate Total Memory
10 min 13 days, 21 hr, 20 min
20 min 27 days, 18 hr, 40 min
30 min 41 days, 16 hr
1 hr 83 days, 8 hr
2 hr 166 days, 16 hr
5 hr 416 days, 16 hr
12 hr 1000 days
IMPERIAL
mph
°F
inHg
ft
12 hour
month/day/year
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 4000 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 4000 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.
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 4000's wind chill is based on the National Weather Service standards as of November 1, 2001.
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Measurement Units
Response Time
Wind Speed MPH
1 second fpm
Knots
Beaufort
m/s
KPH
1 inch diameter impeller with precision axle and sapphire bearings, individually tested in NIST-traceable wind tunnel. Calibration
drift < 1% after 100 hours use at 16 MPH / 7 m/s. Sustained operation above 60 MPH / 27 m/s will wear impeller rapidly and may
cause destruction of impeller. Replacement impeller, PN-0801, may be field-installed without tools (US Patent 5,783,753).
Temperature °F
1 minute °C
Thermally isolated, hermetically sealed, precision thermistor mounted externally (US Patent 5,939,645). Calibration drift negligible.
Relative Humidity %RH
1 minute
Polymer capacitive humidity sensor mounted in thin-walled chamber external to case for rapid, accurate response (US Patent
6,257,074). Response specification is time to achieve 95% or better of stated accuracy. Calibration drift +/- 2% over 24 months.
Relative humidity may be recalibrated at factory or in field using Kestrel Humidity Calibration Kit, PN-0824.
Pressure inHg
1 second hPa
millibars
Monolithic silicon piezoresistive pressure sensor with second-order temperature correction. Maximum error beyond specified
temperature, +/- 0.09 inHg / 3.0 hPa. Calibration drift typically -0.03 inHg / -1.0 hPa per year. Pressure sensor may be recalibrated
at factory or in field (facilitated by Kestrel Computer Interface, PN-0830).
Dewpoint °F
1 minute °C
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Operational Accuracy Specification
Resolution
Range (+/-) Range
0.8 to 89.0 MPH
0.8 to 135.0 0.1
59 to 11,948 1 59 to 7877
0.6 to 118.3 0.1 0.6 to 78
3% of
reading
0 to 12 1 0 to 12
0.4 to 40.0 m/s
0.4 to 60.0 0.1
1.0 0.1 1.0 to 144
-50.0 to 260.0 0.1 1.8 -20 to 158
-45.0 to 125.0 0.1 1 -29 to 70 °C
0.0 to 100.0 0.1 3.0 %RH 5 to 95 % non
8.86 to 32.48 0.01 0.05 At 77°F, <19,700 ft
300.0 to 1100.0 0.1 1.5 At 25 °C, <6,000 m
300.0 to 1100.0 0.1 1.5 At 25 °C, <6,000 m
0.0 to 100.0 %RH, -20 to 158 °F, 20 to
0.1 3.6
-50.0 to 260.0 °F 95% RH
0.0 to 100.0 %RH, -29 to 70 °C, 20 to 95
0.1 2
-45.0 to 125.0 °C %RH
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