Black globe temperature
Accurately measures environmental radiant heat (including direct sunlight and radiant heat from hot machinery)
Workplace Heat Stress Alert System
See heat hazards
before they hit.
Calculates the WBGT heat index in real time and triggers audible-visual alarms and real-time push notifications the moment a threshold is exceeded.
Solar-powered with NB-IoT connectivity, so no wiring is needed on site.
Heat Safety Guardian is a heat hazard alert system developed in-house by YenProtek. It calculates the WBGT heat stress index in real time and, when limits are exceeded, triggers an on-site audible-visual alarm along with SMS, Email and App push notifications.
Legal Obligation
The Work Health and Safety Act of each Australian state and territory requires a person conducting a business or undertaking (PCBU) to eliminate heat risks so far as is reasonably practicable and, where that is not possible, to minimise them, and to provide cool drinking water, training and an emergency response plan. Australia has no nationwide statutory maximum working temperature.
The Australian Capital Territory has applied the Managing the Risks Associated with Extreme Temperatures Code of Practice since 14 November 2025. It requires employers to consult with workers on a temperature management plan and to decide in advance the conditions under which work must stop; in construction, the stop-work threshold should take into account whether the temperature is forecast to exceed 37°C. A code of practice can be used as evidence in legal proceedings.
Requirements vary by country and industry; always confirm your actual obligations against the local regulations in force. This system supports monitoring, alerting and record-keeping, but it does not replace statutory workplace environmental measurements.
Precision Sensing
Simultaneously measures air temperature, humidity, black globe temperature, wind speed, and wind direction, and displays the WBGT heat stress index in real time.
Accurately measures environmental radiant heat (including direct sunlight and radiant heat from hot machinery)
High-sensitivity digital sensing with fast response and low error
Anti-condensation design for stable operation in high-humidity environments
Assesses microclimate heat dissipation and can assist facility ventilation control
The system computes WBGT in real time and proactively issues alerts when readings become abnormal, supporting effective heat hazard management
Three-Layer Synchronised Alerts
When monitored readings reach your custom alert thresholds, the system simultaneously activates on-site warnings, remote notifications, and cloud logging.
A high-decibel, high-brightness audible-visual alarm is triggered immediately on site, alerting workers to heat hazard risk.
The system simultaneously notifies managers of alarms via SMS, Email, App push notifications or LINE, making it easy to monitor site conditions remotely; other messaging apps are coming online progressively.
Environmental data and event records from before and after each alert are retained automatically for later review, tracking, and auditing.
No Wiring Needed
The standard kit includes a solar power module and an NB-IoT communication module, so no additional power or network cabling is required. Installation is quick and easy, making it ideal for temporary construction sites or work areas where equipment is frequently relocated.
Cloud Command Center
Integrated AIoT monitoring makes hard-to-detect heat hazard risks visible in real time.
API & MCP Integration
API and MCP are available to connect monitoring data to existing management systems or AI tools.
Illustrative screen
Standard Kit
A standard kit with flexible expansion modules.
Beyond core heat hazard monitoring, additional sensors can be added to suit your site:
* The brand, appearance, and model of the audible-visual alarm may vary by supply batch; the actual shipped contents shall prevail.
Warranty & Service
As simple as a phone or home appliance: use it straight out of the box, and if it fails under warranty, we replace it.
For one year after purchase, we cover any fault in the product itself, and an extended warranty is available. Actual warranty terms are subject to your quotation.
If it fails under warranty, there's no repair trip and no waiting: we ship a replacement right away, so heat hazard monitoring never stops.
If equipment fails, we ship a replacement unit directly to overseas customers; shipping method and cost are as stated in the quotation.
Solar-powered with NB-IoT wireless transmission, so even temporary sites can be set up quickly.
Designed and manufactured by our team in Taiwan, with remote technical support for overseas customers.
Track Record & Applications
WBGT (Wet Bulb Globe Temperature) is an index that takes into account environmental factors such as air temperature, humidity, wind speed, and radiant heat to assess the risk of heat stress that hot environments pose to the human body. It is also the heat stress assessment index adopted by the ISO 7243 international standard. Heat Safety Guardian calculates WBGT in real time from air temperature, humidity, and globe temperature, and proactively issues alarms when readings become abnormal.
Australia has no nationwide statutory maximum working temperature. The Work Health and Safety Acts of the states and territories require a person conducting a business or undertaking to eliminate or reduce heat risks so far as is reasonably practicable. Since 14 November 2025, the Australian Capital Territory has applied the Managing the Risks Associated with Extreme Temperatures Code of Practice, which requires a temperature management plan to be agreed with workers and stop-work conditions to be decided in advance. In construction, the stop-work threshold should take into account whether the temperature is forecast to exceed 37°C; at 35–37°C, if heat stress is still possible after controls are applied, workers should be moved to a place unaffected by the heat or to an air-conditioned site shed.
Heat Safety Guardian uses a three-tier synchronised alarm mechanism: on site, high-decibel, high-brightness audible and visual alarms alert workers immediately; at the same time, the system sends alarm notifications to managers via SMS, Email and App push notifications (LINE is also supported, and other messaging apps are coming online progressively) so they can keep track of site conditions remotely; and in the cloud, environmental data and event records from before and after each alarm are retained for later review and auditing.
The standard kit includes a solar power module and an NB-IoT communication module, so no additional power or network cabling is required. Installation is quick and easy, making it ideal for temporary construction sites or work areas where equipment is frequently relocated.
Yes. Alert thresholds can be customised to local regulations, guidelines or site needs. When a reading reaches a threshold, on-site alarms and real-time push notifications (LINE, SMS, Email, App) are triggered at the same time.
Yes. Besides outdoor work such as construction sites, road paving, and elevated rooftops, it is also suitable for high-temperature workplaces such as steel mills and high-temperature industrial plants.
The system automatically retains environmental data and event records from before and after each alert for later review, tracking, and auditing.
It comes with a one-year warranty, and an extended warranty is available. If the product fails during the warranty period, there's no need to send it in and wait for repairs: we ship you a replacement right away so your heat hazard monitoring is back up and running as quickly as possible. After the warranty expires, units can be returned to our factory for repair. Actual warranty terms are subject to your quotation.
Connection frequency bands, local telecoms networks, and certification requirements vary by country. Please tell us the country and site where the product will be used, and we will confirm the suitable communication version and supply arrangements.
NB-IoT communication module
Solar power module No power or network wiring needed
On-site audible-visual alarm SMS, Email and App alert push notifications Cloud data and event records
App and cloud management system Viewable on phones, tablets and computers
Air quality (PM2.5/PM10) Decibel noise sensor Rainfall sensor UV index sensor
API and MCP are available to connect monitoring data to existing management systems or AI tools
Designed and manufactured by our team in Taiwan Remote technical support for overseas customers
One-year warranty Faulty units replaced with new ones during warranty Extended warranty available Actual terms subject to quotation
Ideal for outdoor work and high-temperature workplaces that are prone to heat and localised microclimate effects and require stronger heat hazard management:
High-temperature work risks should not go unnoticed until someone feels unwell. With real-time monitoring and proactive alerts, managers can spot risks early and arrange rest and protection in time, so every hardworking outdoor worker can go home safely.