Heat Stress Meters

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Heat Stress, WBGT, and Thermal Work Limits Explained

In Australia's diverse work environments, from warehouses to sun-exposed construction sites, keeping your team safe from the risks of heat stress is a constant priority. It's not just about comfort; it's about ensuring on-site environmental factors—both indoors and out—are within safe working limits

To help you effectively measure and manage this risk, professionals in the field rely on three key parameters, see our detailed metric guide below.

Understanding Heat Stress Key Metrics

Heat Index (HI)

Think of Heat Index (HI) as a baseline. It provides a simple, foundational measurement of heat stress by combining air temperature with relative humidity. In essence, it tells you what the ambient conditions feel like to the human body, providing a quick reference point for how conditions will affect your team.

Wet-Bulb Globe Temperature (WBGT)

Taking it a step further, the Wet-Bulb Globe Temperature (WBGT) is a more specialised and widely adopted heat stress index. It provides a comprehensive risk assessment by factoring in not just temperature and humidity, but also wind speed and solar radiation. This makes it an essential tool for guiding exposure limits and managing on-site heat risk.

Thermal Work Limit (TWL)

For the most comprehensive heat stress measurement, the Thermal Work Limit (TWL) takes all the data points of WBGT and adds even more, including atmospheric pressure and clothing type. By considering these additional variables, a TWL reading can provide dynamic work-rest schedules, giving you precise, data-driven recommendations to ensure your team's safety and maintain compliance throughout the workday.

By moving from a simple baseline like the Heat Index to more comprehensive metrics like WBGT and TWL, you gain a powerful, data-driven perspective on heat risk. With the right tools you can simplify the process of gathering and acting on this critical data, ensuring your team is always protected.

Frequently Asked Questions

What is heat stress?

Heat stress occurs when the body's internal heat regulation system is overwhelmed and thermal work load has been exceeded. This occurs when the heat in the environment is larger than the physical exertion of a body's ability to dissipate it through sweating or respiration methods. Leading the core temperature of the body to rise. 

How to combat heat stress in cattle?

Similar to humans, livestock are also susceptible to heat stress, resulting in reduced milk production, poor weight gain, and increased mortality. To combat heat stress in livestock, the Kestrel Drop D2 Livestock Heat Stress Monitor is a handy device that can monitor conditions while grazing or during transport. With a dedicated cattle measurement mode of when external conditions will affect milk production. 

What is WBGT?

WBGT stands for Wet Bulb Globe Temperature, considered by some to be the industry standard for heat stress monitoring. Unlike a heat index that only considers temperature and humidity. WBGT factors in other parameters to ensure readings are more reflective of work conditions being experienced, factoring in ambient temperature, the radiant heat from the sun, and wind. Creating a more realistic picture of what workers are experiencing.  

Heat Stress Meter Buyers Guide

With 3 main parameters used by professionals in the field. We’ll show you the best meters that can serve as powerful tools to proactively mitigate heat stress and ensure a safer workplace.

Kestrel 5400 Heat Stress WBGT Meter | IC-0854ORA, This powerful meter is designed for on-site use, measuring both WBGT and TWL to give you a more in-depth overview of heat stress factors in the field. 

Scarlet Heat Stress Detector | IC-TWL-1S, For the most precise and detailed analysis, the IC-TWL-1S takes heat stress measurement one step further. While measuring both WBGT and TWL like similar meters, its unique design includes an optimised globe that considers Mean Radiant Temperature (MRT).

TWL-1SV Online Heat Stress Weather Station | IC-TWL-1SV, For the ultimate proactive heat stress solution, the IC-TWL-1SV monitors all three key metrics: HI, WBGT, and TWL. With its real-time connectivity to the Scarlet Cloud portal and app allows various stakeholders to remotely access on-site data and heat stress trends.

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