Nielsen-Kellerman
610.447.1555
www.nkhome.com
Instruction Manual for Kestrel 4100 version: 4.01 ALL
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Data Display and
Storage
Minimum, maximum, average and logged history stored and displayed for every
measured value. 480-point data logger with graphical display. Auto data storage; interval
settable from 2 seconds to 12 hours. Manual data capture.
Display Digits
Multifunction, multi-digit programmable dot-matrix display.
Display Update
1 second
Display Languages
English, French, German, Italian, Spanish
Display Backlight
Aviation green electroluminescent backlight. Automatic or manual operation.
Operational
Temperature Range
The operational temperature range of the liquid crystal display and batteries is 0° F to
131° F / -18 °C to 55 °C. Beyond the limits of this range, the unit must be maintained
within range and exposed for minimum time necessary to take reading.
Storage Temperature
-22 °F to 140 °F / -30 °C to 60 °C
Auto Shutdown
User-selectable: 15 minutes, 60 minutes or disabled
Batteries
AAA Alkaline, two, included. Average life, 400 hours of use, +/-depending on backlight
use.
Sealing
Waterproof (IP69 standard)
Dimensions
5.0 x 1.8 x 1.1 in / 12.7 x 4.5 x 2.8 cm
Weight
3.6 oz / 102 gm
Color
Safety orange.
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Measurement
Units
Operational
Range
Resolution
Accuracy
(+/-)
Specification Range
Temperature
°F
-50.0 to 260.0
0.1
1.8
-20 to 158
1 minute
°C
-45.0 to 125.0
0.1
1
-2 to 70 °C
Relative Humidity
%RH
0.0 to 100.0
0.1
3.0 %RH
5 to 95 % non condensing
1 minute
Wind Chill
°F
0.7 to 135.0 MPH, -
50.0 to 260.0 °F
0.1
1.8
1.8 to 89 MPH, -20 to 158 °F
1 second
°C
0.4 to 60.0 m/s, -45.0
to 125.0 °C
0.1
1
0.4 to 40 m/s, -29 to 70 °C
Dewpoint
°F
0.0 to 100.0 %RH, -
50.0 to 260.0 °F
0.1
3.6
-20 to 158 °F, 20 to 95% RH
1 minute
°C
0.0 to 100.0 %RH, -
45.0 to 125.0 °C
0.1
2
-29 to 70 °C, 20 to 95 %RH
Heat Index
°F
0.0 to 100.0 %RH, -
50.0 to 260.0 °F
0.1
3.6
-20 to 158 °F, 20 to 95% RH
1 minute
°C
0.0 to 100.0 %RH, -
45.0 to 125.0 °C
0.1
2
-29 to 70 °C, 20 to 95 %RH
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.
The above values are calculated from the primary measurements of wind speed, temperature and relative humidity.
Thermally isolated, hermetically sealed, precision thermistor mounted externally (US Patent 5,939,645). Calibration drift negligible.
Measurement
Units
Operational
Range
Resolution
Accuracy
(+/-)
Specification
Range
Response Time
Air Velocity
MPH
0.8 to 135.0
0.1
0.8 to 89.0 MPH
1 second
fpm
59 to 11,948
1
59 to 7877
Knots
0.6 to 118.3
0.1
0.6 to 78
Beaufort
0 to 12
1
0 to 12
m/s
0.4 to 60.0
0.1
0.4 to 40.0 m/s
KPH
1.0
0.1
1.0 to 144
Air Flow
cfm
0 to 99,999
1
0 to 99,999
1 second
m
3
/h
0 to 99,999
1
0 to 99,999
m
3
/m
0 to 99,999
1
0 to 99,999
m
3
/s
0 to 99,999
0.1
0 to 99,999
L/s
0 to 99,999
1
0 to 99,999
3% of
reading
3% of
reading
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).
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