Heat Stress and Thermal Comfort Monitoring System

When Heat Becomes a Hazard

Air temperature alone does not tell you how hot it actually feels, or how dangerous the heat is. Humidity, wind, and radiant heat from the sun all change how the body experiences temperature. In Singapore’s climate, this difference can be the line between safe and hazardous conditions for people working or active outdoors.

The Wet Bulb Globe Temperature (WBGT) is the internationally recognized measure of heat stress, combining air temperature, humidity, wind speed, and solar radiation into a single index. Singapore’s Ministry of Manpower requires WBGT monitoring for outdoor work, with on-site heat stress monitoring and warning system mandatory for larger construction sites, shipyards, and the process industry.

• WBGT and ISO 7243 compliance — the standard heat stress index, derived from air temperature, humidity, wind speed, and a black globe sensor compliant with ISO 7243, the international standard for hot environments.

• Compact all-in-one heat stress weather station — a professional-grade integrated weather station, combining all heat stress measurements in a single compact unit. Suitable for microclimate deployment. 

• Handheld thermal comfort meter — a portable instrument delivering direct readings of PMV (Predicted Mean Vote), PPD (Predicted Percentage Dissatisfied), and UTCI (Universal Thermal Climate Index) for thermal comfort assessment in any setting.

• ISO 7726 compliance (optional) — The international standard for instruments measuring physical quantities for thermal comfort — for research and specialised applications.

• Automatic alerts — when WBGT crosses defined thresholds, the system sends alerts by email or message, and triggers on-site audio and visual warnings prompting workers to take breaks and rehydrate in line with MOM requirements.