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)