How to troubleshoot if the mass flow controller fails

The mass flow controller is a new type of flow measuring instrument, which is composed of a sensor and a transmitter for signal processing, and is equipped with a flow totalizer to form a flow measurement system. There are a pair of parallel measuring tubes (various shapes depending on the manufacturer) in the shell of the mass flow controller. Under the action of the electromagnetic drive coil installed at the end of the tubes, the tubes vibrate similarly to a tuning fork. The mass flow controller can be directly used to measure the mass flow, density and temperature of the medium. It has the characteristics of high measurement accuracy, wide range ratio, good stability and low maintenance, and has been widely used in the petrochemical industry. When the mass flow controller fails, the fault location can be analyzed according to the different measurement parameters, so as to eliminate the fault. 1. When it is found that the mass flow controller is not working properly, you can go to the site to check the indication values ​​of the same intuitive instrument. If they are very different, it is likely that the mass flow controller system is faulty. 2. Before analyzing and checking the failure of the mass flow controller system, it is necessary to learn about the production load and parameter changes of raw materials from the on-site operators, check the record curve of the faulty instrument, and conduct a comprehensive analysis to determine the cause of the failure of the mass flow controller . 3. When changing the process parameters, it is found that the record curve has a sudden change or jumps to a large or small value. At this time, the fault is often in the instrument system. 4. Before the fault occurs, the record curve of the instrument has always been normal. After the fluctuation, the record curve becomes irregular or makes the system difficult to control, even manual operation cannot be controlled. At this time, the fault of the mass flow controller may be caused by the process operating system . 5. Before analyzing the failure of the mass flow controller, it is necessary to thoroughly understand the production process, production process and conditions of the relevant instrument system, understand the design plan and design intention of the mass flow controller, the structure, characteristics, performance and parameter requirements, etc. When analyzing the cause of the failure of the mass flow controller, we must comprehensively consider and analyze carefully from the two aspects of the field instrument system and the process operating system, and check the cause.

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