A tranter plate heat exchanger is a thermal device that transfers the heat of a hot fluid to a cold fluid. According to the law of conservation of energy, heat transfer is also an energy balance. The heat transfer process of heat exchangers is generally divided into three types, namely conduction, convection and radiation.The heat exchanger for the food industry should absolutely avoid the incorporation of foreign matter such as heat medium into the product, but cracks will inevitably occur due to the structure and life limit of the tranter plate heat exchanger. Usually cracks cannot occur on most or all of the plates in a short period of time, but slowly and gradually appear one by one. Therefore, once a crack occurs on the board, the pressure on the side of the product can be increased to be larger than the fluid pressure on the side of the heat medium to prevent the heat medium from entering the product, thereby extending the operation period. When the crack is continuously enlarged, the product enters the fluid on the side of the heat medium, so that the backflow of the heat medium is blocked, thereby judging that cracks appear on the board. Therefore, plate heat exchange equipment must be regularly repaired.