Correct installation is the key to successful mass flow meter operation

Abstract: Correct installation is the key information for the successful operation of mass flow meters. Mass flow meter is a new type of flow meter developed according to the Coriolis principle that directly measures the mass flow of fluid in closed pipes. It has high measurement accuracy, good long-term stability, and measurement accuracy is not affected by changes in medium density. Basically ignore it. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the key article details of the successful operation of mass flowmeters. Mass flow meter is a new type of flow meter developed according to the Coriolis principle that directly measures the mass flow of fluid in closed pipes. It has high measurement accuracy, good long-term stability, and measurement accuracy is not affected by changes in medium density. Basically, the influence of medium temperature and pressure change on measurement accuracy can be ignored. thus. It is widely used in many fields requiring high measurement accuracy. Mass flow meters can also be used as high-precision online density meters to measure the real-time density and temperature of fluids. At the same time, it can also calculate other parameters such as volume flow, medium content, concentration and so on. Main application fields of mass flow meters: Food industry: mass flow measurement of dairy products, alcohol, beverages, syrup, chocolate, edible oil, etc. Petrochemical: olefins, light olefins (including gasoline and diesel), aromatic hydrocarbons and liquefied petroleum gas, etc. Mass flow measurement of petrochemical products Fine chemical industry: mass flow measurement of raw materials and products in salt chemical, resin chemical, chemical auxiliaries and other industries Pharmaceutical industry: mass flow measurement of raw materials and finished products of pharmaceutical products Storage and operation industry: various chemicals On-line mass flow measurement for storage, loading, and shipping of raw materials and oil products. Although the quality control and monitoring of on-line measurement products and monitoring of fast and variable fluid density and monitoring of mass flow meters have many advantages, experience has proved that their installation is correct or not, it has a considerable impact on the successful operation of mass flow meters. . In a new project of 600,000 tons of caustic soda in Shandong Province, users have selected three brands of mass flow meters as measuring instruments. Among them: 4 sets of American Emerson brand DN50 are used for liquid chlorine measurement, 3 sets of German E+H DN80 are used for 50% caustic soda measurement, and 4 domestic Zhonglong brand DN100 are used for 32% caustic soda measurement. However, due to problems in communication between users and suppliers, these 12 mass flow meters were not installed as required. As a result, after all 12 mass flow meters are in operation, the minimum error with the weighing scale is 1%, and the maximum measurement of liquid chlorine reaches 8.5%. This real case shows that whether it is a mass flow meter product of a domestic brand or a world famous brand, whether it is installed correctly or not has a great impact on its successful operation. First, the following aspects should be understood before installation: 1. The problem of bubbles. When used for liquid flow measurement, when the content of mist gas exceeds 1% to 5% of the volume content, the mass flow meter will stop working. These bubbles damp the vibration of the flow tube used to generate the Coriolis force and should dissipate the gas before the sensor. If this is difficult to achieve, minimize the gas content (increase the pressure within the sensor as much as possible) to ensure that the bubbles are evenly dispersed into smaller bubbles (maintain a high liquid flow rate). The measurement error of liquid chlorine in the above-mentioned case is related to this. Bubbles are created when the pressure of a liquid is lower than its vapor pressure. The pressure drop across the sensor caused by the geometry of the flow tube and the flow of the liquid can reduce the effective pressure of the liquid below its vapor pressure, and gas in the liquid in the pipe can have the same effect on the sensor as a fog bubble. Once the sensor is sized, the back pressure required to maintain the liquid state can be calculated. Install the sensor in a location that can meet the required back pressure. 2. Sediment and suspended matter. Mass flow meters can calculate the mass content of one component in a solution or slurry of two components. Accurate density measurement must avoid situations where sediment adheres to the measuring tube wall or solid particles settle out of the suspension (flow rate too low). 3. Installation direction. Theoretically, the mass flow meter can be measured in both directions. However, because the outflow coefficients of the two flow directions are different, they should be installed according to the flow direction given by the manufacturer when they leave the factory. Mass flow meters can be installed on horizontal or vertical pipes. Mounting orientation depends on the application

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