ABSTRACT
Too much exposure in a very hot environment can cause heat stress which leads to the fatal heat stroke. To prevent heat stress related diseases, flexible self adhesive patch for professional heat stress monitoring service has been developed. By using flexible printed circuit board (PCB) and silicone based packaging, high level of robustness and ease of usage has been accomplished. This patch can be repeatedly attached to the chest of the user with comfort. And it can stand the sweat and be washed with water to reuse. For this patch is small in size (9 cm triangle shape) and light in weight (55g), it can be used in the most demanding situation. To analyze the heat stress of user, it records 1 lead electrocardiogram, body temperature, humidity and 2-axis acceleration. It's Bluetoothtrade communication module can connect various terminal device according to the configuration. With the body weight input by user and 3 week work log it can estimate user work load, acclimatization, total amount of work done, wet bulb globe temperature (WBGT) index, which is the screening criteria for heat stress exposure.