英語翻譯
To accurately control process temperature without extensive operator involvement,a temperature control system relies upon a controller,which accepts a temperature sensor such as a thermocouple or RTD as input.It compares the actual temperature to the desired control temperature,or setpoint,and provides an output to a control element.The controller is one part of the entire control system,and the whole system should be analyzed in selecting the proper controller.The following items should be considered when selecting a controller: