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. Local and remote control system (program control type): You can choose to connect to a PC through RS232, RS485 interface or aviation plug, and modify and control the parameters of the equipment through the computer. You can also transmit various parameters of the equipment operation to the computer in a timely manner. These signals are all standard relay node types, which can easily exchange information with online supporting equipment. Through online signals, they provide protection for user devices and effectively improve the safety of equipment operation. At the same time, this device also supports external device control signal input, which can receive TTL signals or contact signals. External devices can independently control the chiller.