The mass flow controller can analyze the fault according to the different measurement parameters

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. Mass flow controllers have high precision and high prices, which requires careful maintenance, such as equipping them with high-quality regulated power supplies, frequent inspections of on-site vibration and operating conditions, etc., to ensure the accuracy and instrument performance. Safety. During the use of the mass flow controller, it is necessary to carry out accurate zero point calibration under the conditions of use. The mass flow controller belongs to the height measuring instrument used online. The drift of the zero point will affect the measurement results. It must be calibrated regularly during long-term use. It is necessary to avoid the occurrence of exceeding the range of the instrument used, which will cause a decrease in the measurement accuracy of the instrument, and in severe cases, it will cause damage to the instrument. For example, operations such as steam sweeping that exceed the operating temperature range of the instrument will damage the detection coil and make the instrument unusable. When using the mass flow controller at ordinary times, it is necessary to prevent artificial power failure and disconnection. The mass flow controller does not measure for a short period of time by cutting off the power and disconnecting the signal line, which will cause measurement disputes. Such problems should be paid attention to. The solution is to lock the instrument box, and a special person is responsible for the management.

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