Use the overtemperature protective device together in the case that you use it as temperature adjustment tool. If the temperature control thermostat gets brake (liquid leakage due to the heat-sensitive part, damage of capillary tube or diaphragm portion), not available to open and close the contacts and it may cause fire. Do not use it that ambient temperature is 80 deg C or higher environment. Do not install it in locations across the water to the main body. Install it in a location to be always controlled the whole sensitive parts. In the case of partial insertion or partial contact, not available to detect normal temperature sensing and it exceeds the set temperature. Fire or burns may occur.