An isolator is a device used to completely isolate two circuits or systems, preventing current or signal transmission between them and thereby achieving electrical isolation and protection. The principle of the isolator is to use independent power supplies and various coupling methods, such as magnetic, optical, or capacitive coupling, to achieve circuit isolation. It usually consists of two main aspects: electrical isolation between the input and output ends, and signal coupling between the input and output ends. When selecting an isolator, you should consider the actual application requirements, such as temperature, pressure, flow, and other parameters, and choose a suitable isolator model. It is important to select an isolator with high precision and good stability that meets the application requirements. Additionally, choose an isolator that is easy to install, debug, and maintain to reduce the overall cost of use.