Kestrel 5400 User Manual

20
The Kestrel 5400 also displays a measure of human heat
stress known as “Thermal Work Limit,” or “TWL.” Unlike WBGT,
which is a measure of the environment, TWL is an estimate
of the cooling capacity of a human body in given conditions.
Accordingly, a higher TWL is safer because a person is able to
eliminate more heat from their body. TWL provides four work
level recommendations (Unrestricted, Acclimatization, Buer,
and Withdraw) to help guide work management in thermally
dangerous conditions.
THERMAL WORK LIMIT TWL
TWL w/m
2
154.2
Acclime
TWL CURRENT MEASUREMENT SCREEN
*Unacclimatized workers are dened as new workers who have been o work for more than 14 days due to illness or leave (outside the tropics).
» Measurement & Icon
» Units
» TWL Measurement
» Working Zone
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Kestrel 5400 Specifications

General

Measurement Functions	Wind speed, Temperature, Humidity, Pressure
Temperature Range	-20 to 70°C (-4 to 158°F)
Humidity Range	0 to 100%
Battery Type	AA battery
Waterproof	Yes, IP67
Data Logging	Yes, up to 10, 000 data points
Bluetooth	Yes, Bluetooth Low Energy
Display	Monochrome LCD
Battery Life	400 hours
Operating Temperature	-10 to 55 °C
Wind Speed Range	0.6 to 40 m/s (1.3 to 89 mph)
Accuracy	Varies by measurement function
Resolution	Wind speed: 0.1 m/s, Temperature: 0.1°C, Humidity: 0.1% RH, Pressure: 0.1 hPa