Abstract: Heat exhaustion is a common disease of firefighters, mainly manifested by the loss of body fluids and electrolytes, leading to the failure of peripheral vascular circulation, and then life‒threatening. In this work, a multi‒channel electrochemical sweat sensing fabric was designed. The preparation methods of pH, sodium ion and potassium ion sensor fibers were studied, and their sensing properties to sweat components were analyzed. The results show that the pH, sodium ion and potassium ion sensors based on fiber materials show good sensitivity, linearity and anti‒interference. Among them, the sensitivity of pH sensor fiber is 53.33 mV pH‒1, the sensitivity of sodium ion sensor fiber is 30.83 mV dec‒1, and the sensitivity of potassium ion sensor fiber is 49.16 mV dec‒1, which provides an effective guarantee for preventing heat exhaustion.

Key words: fireman, heat exhaustion warning, sensing fiber, sweat sensor