Measure heat stress with WBGT and Thermal Work Limit from one compact weather station.
The MaxiMet GMX552 is our first compact weather station to deliver both Wet Bulb Globe Temperature (WBGT) and Thermal Work Limit (TWL) from a single integrated instrument. One installation. Two internationally recognised heat stress indices. No additional hardware.
One station. Two internationally recognised heat stress indices.
Whether you’re reporting against WBGT, Thermal Work Limit or both, the MaxiMet GMX552 delivers the environmental data you need from a single compact weather station.
The latest firmware adds Thermal Work Limit calculations alongside existing WBGT capability, extending the GMX552 without changing the hardware.
One instrument. One installation. Two recognised methodologies.
WBGT and Thermal Work Limit
WBGT tells you how stressful the environment is. TWL estimates how much work can be sustained safely. The GMX552 calculates both onboard.
Wet Bulb Globe Temperature
Onboard WBGT calculation to ISO 7243:2017, up to 70°C. Derived or true measurement, with an optional wet bulb sensor for increased accuracy. It tells you how stressful the environment is.
Thermal Work Limit
Onboard TWL calculation in watts per square metre (W/m²), added via the latest firmware. It estimates the safe, sustainable work rate for the prevailing conditions.
What the GMX552 measures
Six environmental measurements generate WBGT, Thermal Work Limit and multiple additional weather outputs, all from a single integrated weather station.
Why measure both?
Different industries and regions specify different approaches to heat stress monitoring. WBGT remains the global benchmark for occupational heat stress assessment. Thermal Work Limit is increasingly specified across mining and heavy industry, particularly in Australia and the Middle East.
Supporting both enables organisations to meet regional requirements, compare methodologies and make better-informed operational decisions from the same environmental measurements.
Extend capability. Not hardware.
Because the GMX552 already measures the environmental parameters required to calculate both indices, no additional hardware is required. Compatible units already in the field can simply be updated, and new systems include both WBGT and TWL as standard.
Update existing units
Compatible GMX552 instruments in the field update with the latest firmware.
Both indices as standard
New systems ship with WBGT and TWL ready to deploy.
No extra sensors
One compact station, no moving parts, both indices from the same dataset.
Typical applications
Wherever people work in the heat, accurate measurement supports safety, productivity and compliance.
Farm worker safety
Protects the health and safety of farm workers while sustaining productivity.
Demanding environments
Heat stress measurement for safety, productivity and legal compliance in extreme heat.
Hot work sites
Protects workers and supports compliance across plants, foundries and sites.
Public health
Accurate local data to report, manage and maintain public health during heat events.
Mission readiness
Safeguards health, mission readiness and operational effectiveness in training.
Athlete & spectator safety
Protects athletes and spectators, and supports safe event management.
Built for the field
Protect people sooner
Spot dangerous heat conditions early, reducing sickness and supporting long-term productivity.
Meet recognised standards
WBGT to ISO 7243:2017, plus TWL, supporting occupational heat action plans and compliance.
Built for harsh environments
Low-maintenance solid components deliver long operational life and reduced upkeep.
Trust every measurement
High-quality, extensively tested solid state sensors provide accurate, dependable data.
Fits existing systems
Single data string output, comprehensive software and a range of communication protocols.
Deploy almost anywhere
Runs on battery or solar power, built to perform wherever you need it.
Discover how the MaxiMet GMX552 delivers both WBGT and Thermal Work Limit from a single compact weather station.
Tell us about your application and environment, and we will help you specify the right configuration.
Prefer to read up first? Read the WBGT vs TWL guide.