This course introduces students to basic process instrumentation system in chemical engineering. The course emphasizes two main systems of process instrumentation, i.e. analog and digital system, which its contents cover the basic control system, analog and digital controller and final control elements. At the end of the course students should be able to explain the instrumentation process characteristics as well as to explain the knowledge of the main elements used in the instrumentation, which are transducers and signal modifier, and hence its applications in chemical and gas engineering processes.