Name: Kestrel 5400 Heat Stress Tracker (0854ORA)
Brand: Kestrel

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SENSORS

ACCURACY

RESOLUTION

SPECIFICATION RANGE

NOTES

Wind Speed |Air

Larger of 3% of reading, least significant digit or 20 ft/min Speed

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 off axis; -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 noncondensing

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 hPa|mbar
0.044 inHg
0.022 PSI

0.1 hPa|mbar
0.01 inHg
0.01 PSI

25°C/77°F
700-1100 hPa|mbar
20.67-32.48 inHg
10.15-15.95 PSI

Monolithic silicon piezo-resistive pressure sensor with second-order temperature correction. Between 1100–1600 mbar, unit will operate with reduced accuracy. Sensor may not operate above 1600 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 magneto-resistive 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

AHLU

AHLU Accuracy derived from HLI accuracy accumulated over time.

1.0

Wind Speed,
Temperature Globe Temperature,
Relative Humidity

Altitude

typical: 23.6 ft/7.2 m
from 750 to 1100 mBar
max: 48.2 ft/14.7 m
from 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

HLI

2.7

1.0

Wind Speed, Temperature Globe Temperature, Relative Humidity

Outdoor Wet Bulb Globe Temperature (WBGT)

1.3 °F
0.7 °C

0.1 °F
0.1 °C

Wind Speed, Temperature Globe Temperature, Rative Humidity, Pressure

Probability of Ignition (PIG)

PIG Accuracy dependent on proximity of inputs to reference table steps.

10%

Temperature, Relative Humidity

THI (NRC)

1.5 °F
0.8 °C

0.1 °F
0.1 °C

Temperature, Relative Humidity

THI (Yousef)

2.3 °F
1.3 °C

0.1 °F
0.1 °C

Temperature, Relative Humidity

Thermal Work Limit (TWL)

10.9W/m2

0.1 °F
0.1 °C

TWind Speed,
Temperature Globe Temperature,
Relative Humidity,
Pressure

Wet Bulb Temperature - Psychrometric

3.2 °F
1.8 °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, multidigit 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, FCC, IC tested 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 516.6 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

5.0 x 1.9 x 1.1 in | 12.7 x 4.5 x 2.8 cm, 4.3 oz | 121 g. (Lithium battery included)