Abstract: The RFA-300 chemical analyzer system is the product of ALPKEM analytical company. It is comprised of the following modules: auto-sampler, peristaltic pump,analytical cartridge, detectors and recorder. Because of its high accuracy and precision, rapid analytical speed, it is widespread applied in industries, such as food, pharmaceutical, water industries etc. In order to operate the system properly, I summerise the following experiance of the principle operation and troublelocating of system.