HR series a kind of heating & cooling circulator device that can provide heating source or cold source. It usually consists of a main control system and two independent temperature control systems, respectively used to control the temperature of high and low temperature areas. It’s widely used in scientific research laboratories, industrial production, pharmaceutical manufacturing, and other fields. It can provide a high-temperature environment for baking, heat treatment, drying and other operations, as well as a low-temperature environment for freezing, cooling, refrigeration and other applications.The fully enclosed pipeline design and high-efficiency plate heat exchange,while reducing the demand for heat transfer fluid and improve the heat utilization rate cf the system.While reducing the demand for thermal fluid,improve the heat utilization rate of the system to achieve rapid temperature rise and fall.The heat transfer medium is in a closed system with an expansion vessel,and the heat transfer medium in the expansion vessel does not participate in the circulation,whether it is high temperature or low temperature.The temperature of the expansion tank keep at 60℃ which effectively reduces the risk of moisture absorption and volatilization of the heat transfer medium during the operation.