A refrigeration and heating cycle device refers to a circulation device that provides heat and cold sources for reaction vessels, tanks, etc. It is a laboratory instrument and equipment with dual functions of heating and cooling. The high and low temperature circulators produced by our company guide the circulation of heat medium in a closed circulation system to heat or cool the required objects, that is, to establish a second constant temperature place. They are mainly used in the fields of chemical, pharmaceutical, and biological industries to support glass reaction vessels, rotary evaporators, fermentation tanks, and calorimeters; Widely used in research departments such as petroleum, metallurgy, medicine, biochemistry, physical properties, testing, and chemical synthesis, universities, factory laboratories, and metrology and quality inspection departments. Intelligent control system (conventional type): The intelligent control system adopts self-tuning PID algorithm, which can be applied to various environments and devices, with high temperature control accuracy. The device has temperature correction function, which is more accurate than ordinary temperature controllers for temperature measurement. A prominent control panel with simple and quick operation.