The aviation airproof technology is advanced in China. Upon making vacuum inside temperature-sensitive probe, the inert gas is injected to effectively avoid arc generation at contact, the reliability of movement of moving contract, under guarantee of QS9000quality system. They utilize overseas high-quality dished dual metallic piece as temperature gathering element, install thermal protector at the temperature sensitive position of water tanks, collect the temperature changes of water tanks on real-time basis and take the action of safe protection to water tanks of cars.