13
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.
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.
METRIC
IMPERIAL
Automatic Data Store
On
On
Data Store Rate
1 hour
1 hour
Data Overwrite
On
On
Manual Data Store
On
On
Wind Functions
m/s
mph
Temperature Functions
°C
°F
Barometric Pressure
hPa
inHg
Altitude Functions
m
ft
User Screen1
wind speed, temperature, humidity
User Screen 2
humidity, dewpoint, wet bulb
User Screen 3
pressure, altitude, density altitdue
Display Contrast
10
10
Automatic Shutdown
15 minutes
15 minutes
Time Format
24 hour
12 hour
Date Format
day/month/year
month/day/year
Language
English
English
14
15
ACCURACY
(Within OPERATIONAL RANGE stated below)
Wind Speed
±3% of reading
Temperature
±1°C
Wind Chill
±2°C
Wet Bulb Temp
±2°C
Dewpoint
±3°C
(above 20% RH)
Heat Index
±3°C
Relative Humidity
±3%
Pressure
±3hPa
Altitude
±30m
(at standard atmospheric conditions)
Altitude Resolution
1m
Density Altitude
±75m
UNITS AND OPERATIONAL RANGE
Units
Low End
High End
Knots
0.6
78
Meters per Second
0.3
40
Kilometers per Hour
1.0
144
Miles per Hour
0.7
89
Feet per Minute
59
7877
Beaufort Force
1
16
Celsius
-29
70
Fahrenheit
-20
158
Percent Humidity
5
95
Meters
-500
9000
Feet
-1500
30000
Hectopascal (or mbar)
870.0
1080.0
Inches Mercury
25.70
31.90
RESPONSE TIME
Wind Speed 1 Second
Temperature, Relative
Humidity, Wind Chill,
<1 Minute
Heat Index, Dewpoint
DISPLAY
Update 1 second
Temperature Range Normal operation from -20°C to 60°C [-4°F
to 140°F]. Below -20°C [-4°F], accurate
readings may be taken by keeping the unit
warmer than -20°C [-4°F] and exposing it
for the minimum time necessary to take a
reading (less than one minute).
Storage Temperature -30°C to 60°C [-22°F to 140°F].
PHYSICAL
Battery Two AAA alkaline batteries (included).
Impeller 25 mm. [1in.] diameter, sapphire
bearings, light weight. User-replaceable
impeller/housing assembly.
Temperature Sensor Hermetically sealed precision thermistor.
Humidity Sensor Capacitive sensor.
Pressure Sensor Monolithic Silicon Piezoresisitive sensor.
Dimensions 12.7 x 4.5 x 2.8 cm. [5 x 1.8 x 1.1 in.]
Weight 102 g. [3.6 oz.]
For more information or more detailed specifications, please visit
www.nkhome.com.
Nielsen-Kellerman
610.447.1555
www.nkhome.com
Instruction Manual for Kestrel 4000 versions: 1.04 EFS 1A, 1.05 EFS 1A
