Kestrel 5500 - Thermal Work Limit (TWL); TWL Measurement and Interpretation; Configuring TWL Clothing Settings

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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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