Certificate of Conformity
© 2015. The enclosed Kestrel Weather & Environmental Meter was manufactured by Nielsen-Kellerman Co. at its facilities located at 21 Creek Circle, Boothwyn, PA 19061 USA.
This instrument was produced under rigorous factory production control and documented
standard procedures. It was individually inspected and leak tested and the functioning of the
display, backlight, buttons and firmware were verified. The accuracy of each of its primary
measurements was individually calibrated and /or validated according to documented standard
test procedures against the standards detailed below. This instrument is warrantied to perform
at the date of first consumer purchase in compliance with the published specifications, including
stated drift since the date of manufacture, for the specific measurements and features of its model
number. (See Kestrel Limited Warranty for full warranty terms.)
Standards Used in Testing
Wind Speed:
The Kestrel Weather & Environmental Meter
impeller installed in this unit was individually
tested in a subsonic wind tunnel operating at
approximately 300 fpm (1.5 m/s) and 1200 fpm
(6.1 m/s) monitored by a Gill Instruments Model
1350 ultrasonic time-of-flight anemometer. The
Standard’s maximum combined uncertainty is
±1.04% within the airspeed range 706.6 to
3923.9 fpm (3.59 to 19.93 m/s), and ±1.66%
within the airspeed range 166.6 to 706.6 fpm
(0.85 to 3.59 m/s).
Temperature:
Temperature response is verified in comparison
with an Ametek DTI-050 Digital Temperature
Indicator and STS Reference Sensor. The
DTI-050 is calibrated annually and is traceable
to NIST with a maximum relative expanded
uncertainty of ± 0.40C.
Direction / Heading
The sensitivity of the magnetic directional sensor
is verified after assembly by orienting the unit
to the cardinal directions and confirming the
magnetic field output. The compass output is
accurate to within ± 5 degrees as compared to a
Suunto KB-14/360R G precision compass.
Relative Humidity:
Relative humidity is verified in comparison with
an Edgetech HT120 Humidity Transmitter. The
HT120 is calibrated annually and is traceable
to NIST with a maximum relative expanded
uncertainty of ±1.0%RH.
Barometric Pressure:
Pressure response is verified against a Vaisala
PTB210A Digital Barometer. The Vaisala
Barometer is calibrated annually and is traceable
to NIST with a maximum relative expanded
uncertainty of ± 0.3hPa.
Approved By:
Nils Steffensen, Director of Engineering
329000_1_16.03.02
Product Specifications for Kestrel 5400 Heat Stress Trackers
SENSORS
SENSOR ACCURACY (+/-) RESOLUTION SPECIFICATION RANGE NOTES
Wind Speed | Air
Flow
Larger of 3% of reading, least
significant digit or 20 ft/min
0.1 m/s
1 ft/min
0.1 km/h
0.1 mph
0.1 knots
1 B*
0.1 F/S*
0.6 to 40.0 m/s
118 to 7,874 ft/min
2.2 to 144.0 km/h
1.3 to 89.5 mph
1.2 to 77.8 knots
0 to 12 B*
2-131.2*
1 inch|25 mm diameter impeller with precision axle and low-friction Zytel® bearings.
Startup speed stated as lower limit, readings may be taken down to 0.4 m/s | 79 ft/
min| 1.5 km/h | .9 mph | .8 kt after impeller startup. Off-axis accuracy -1% @ 5º offaxis;
-2% @ 10º; -3% @ 15º. Calibration drift < 1% after 100 hours use at 16 MPH
| 7 m/s. Replacement impeller (NK PN-0801) field installs without tools (US Patent
5,783,753). Wind speed calibration and testing should be done with triangle on
impeller located at the top front face of the Kestrel. Measuring wind speeds above
60 m/s / 134.2 mph can damage the impeller.
Ambient
Temperature
0.9 °F
0.5 °C
0.1 °F
0.1 °C
-20.0 to 158.0 °F
-29.0 to 70.0 °C
Airflow of 2.2 mph|1 m/s or greater provides fastest response and reduction of
insolation effect. For greatest accuracy, avoid direct sunlight on the temperature
sensor and prolonged sunlight exposure to the unit in low airflow conditions.
Calibration drift is negligible for the life of the product. For further details, see
Display & Battery Operational Temperature Limits.
Globe Temperature 2.5 °F
1.4 °C
0.1 °F
0.1 °C
-20.0 to 140.0 °F
-29.0 to 60.0 °C
Temperature inside 1in|25 mm black powder coated copper globe converted to
Tg equivalent for standard 6 in|150 mm globe. Closest equivalence obtained with
airflow greater than 2.2 mph|1 m/s.
Relative Humidity ±2%RH 0.1 %RH 10 to 90% 25°C non-condensing To achieve stated accuracy, unit must be permitted to equilibrate to external
temperature when exposed to large, rapid temperature changes and be kept out of
direct sunlight. Calibration drift is typically less than ±0.25% per year.
Pressure ±1.5 mbar at 25°C, 700-1100
mbar/ ±0.044inHg at 77°F 20.67-
32.48 inHg/
±0.022 PSI 10.15-15.95 PSI
0.01 inHg
0.1 hPa|mbar
0.01 PSI
25°C/77°F,
700-1100 mbar/20.67-32.48 inHg/10.15-
15.95 PSI
Monolithic silicon piezoresistive pressure sensor with second-order temperature
correction. Between 1100–1200 mbar, unit will operate with reduced accuracy.
Sensor may not operate above 1200 mbar and can be damaged above 6,000 mbar
or below 10 mbar. Calibration drift is negligible for the life of the product.
Compass ±5° 1°
1/16th Cardinal Scale
0 to 360° 2-axis solid-state magnetoresistive sensor mounted perpendicular to unit plane.
Accuracy of sensor dependent upon unit’s vertical position. Self-calibration routine
eliminates magnetic error from batteries or unit and must be run after every full
power- down (battery removal or change). Readout indicates direction to which the
back of the unit is pointed when held in a vertical orientation. Declination/variation
adjustable for True North readout.
CALCULATED MEASUREMENTS
MEASUREMENT ACCURACY (+/-) RESOLUTION SENSORS
EMPLOYED
Altitude typical: 23.6 ft/7.2 m
- 50 to 1100 mBar
max: 48.2 ft/14.7 m
– 300 to 750 mBar
1 ft
1 m
Pressure
User Input (Reference
Pressure)
Barometric Pressure 0.07 inHg
2.4 hPa|mbar
0.03 PSI
0.01 inHg
0.1 hPa|mbar
0.01 PSI
Pressure
User Input (Reference
Altitude)
Crosswind & Headwind/
Tailwind
7.1% 1 mph
1 ft/min
0.1 km/h
0.1 m/s
0.1 knots
Wind Speed Compass
Density Altitude 226 ft
69 m
1 ft
1 m
Temperature Relative
Humidity Pressure
Dew Point 3.4 °F
1.9 °C
15-95% RH. Refer to Range for
Temperature Sensor
0.1 °F
0.1 °C
Temperature Relative
Humidity
Heat Index 7.1°F
4.0°C
0.1 °F
0.1 °C
Temperature Relative
Humidity
Outdoor Wet Bulb Globe
Temperature (WBGT)
3.2 °F
1.8 °C
0.1 °F
0.1 °C
Wind Speed Temperature
Globe Temperature
Relative Humidity
Pressure
Thermal Work Limit (TWL) 10.9W/m2 0.1 °F
0.1 °C
Wind Speed Temperature
Globe Temperature
Relative Humidity
Pressure
Wet Bulb Temperature -
Psychrometric
1.3 °F
0.7 °C
0.1 °F
0.1 °C
Temperature Relative
Humidity Pressure
Wet Bulb Temperature -
Naturally Aspirated (NWB
TEMP)
1.4 °F
0.8 °C
0.1 °F
0.1 °C
Wind Speed Temperature
Globe Temperature
Relative Humidity
Pressure
Wind Chill 1.6 °F
0.9 °C
0.1 °F
0.1 °C
Wind Speed Temperature
ADDITIONAL PRODUCT INFO
Display & Backlight Multifunction, multi-digit monochrome dot-matrix display.
Choice of white or red LED backlight.
Response Time & Display
Update
Display updates every 1 second. After exposure to large
environmental changes, all sensors require an equilibration
period to reach stated accuracy. Measurements employing
RH may require longer periods particularly after prolonged
exposure to very high or very low humidity. WBGT requires
about 8 minutes to reach 95% accuracy and about 15 minutes
to reach 99% accuracy after exposure to large environmental
changes.
Data Storage & Graphical
Display, Min/Max/Avg
History
Logged history stored and displayed for every measured value.
Manual and auto data storage. Min/Max/Avg history may be
reset independently. Auto-store interval settable from 2 seconds
to 12 hours, overwrite on or off. Logs even when display off
except for 2 and 5 second intervals. Kestrel 5 series units hold
over 10,000 data points.
Data Upload & Bluetooth®
Data Connect Option
Wireless range up to 100ft. Connection requires optional USB
data transfer cable or Kestrel Link Dongle or Kestrel LiNK app.
Employs Kestrel Link protocol for data transmission with Link
supported devices. (Kestrel LiNK for iOS/Android, Kestrel Link
for PC/MAC).
Clock / Calendar Real-time hours:minutes:seconds clock, calendar, automatic
leap-year adjustment.
Auto Shutdown User-selectable – Off, 15-60 minutes with no key presses.
Languages English, French, German, Spanish.
Certifications CE certified, RoHS and WEEE compliant. Individually tested to
NIST-traceable standards.
Origin Designed and manufactured in the USA from US and imported
components. Complies with Regional Value Content and Tariff
Code Transformation requirements for NAFTA Preference
Criterion B.
Battery Life AA Lithium, included. Up to 400 hours of use, reduced by
backlight, alert light and buzzer, or Bluetooth radio transmission
use.
Shock Resistance MIL-STD-810g, Transit Shock, Method 516.5 Procedure IV; unit
only; impact may damage replaceable impeller.
Sealing Waterproof (IP67 and NEMA-6)
Display & Battery
Operational Temperature
Limits
14° F to 131° F | -10 °C to 55 °C Measurements may be taken
beyond the limits of the operational temperature range of
the display and batteries by maintaining the unit within the
operational range and then exposing it to the more extreme
environment for the minimum time necessary to take reading.
Storage Temperature -22.0 °F to 140.0 °F | -30.0 °C to 60.0 °C.
Size & Weight 6.5 x 1.9 x 1.1 in / 16.5 x 4.5 x 2.8 cm, 4.8 oz / 136 g. (Lithium
battery included)
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