Thermal Work Limit Monitoring System

Environmental Monitoring for Thermal Work Limits

Heat stress poses a significant health and safety risk for workers in industries such as construction, public safety, military, and mining. Traditional heat indices, such as the Heat Index (HI) and Wet Bulb Globe Temperature (WBGT), offer guidance but may fall short in accounting for critical environmental factors such as wind and shade, potentially leading to overly conservative and/or insufficient mitigation.

Thermal Work Limit calculates the maximum safe metabolic rate (energy expenditure) for workers while maintaining a safe core body temperature and sweat rate. TWL incorporates parameters including dry and wet bulb temperature, black globe temperature, wind speed, and atmospheric pressure. The CWS monitoring technologies determine TWL with calculated wet bulb temperature.

TWL System Components

• – ​Select a CWS Weather Station Model with wind, temperature, humidity, and barometric pressure
• – Black Globe Temp Sensor - 150 mm diameter hollow copper sphere with a matte black finish with temperature probe (ISO 7243) 
• – Sensors include 50-feet of cable each
• – Select a CWS monitoring option: Weather MicroServer, WeatherMaster Software, and/or Weather Display

Click to Better Understand Thermal Work Limit with this White Paper