Mass flow meters are generally only used to measure liquid flow

Mass flowmeter is a relatively accurate, fast, reliable, efficient, stable and sensitive flow measuring instrument, which has a wide range of application values ​​in gas and other fields. As long as the mass flowmeter is properly installed and used, it can effectively improve the measurement accuracy, reduce manpower input, and improve economic benefits. The mass flowmeter is generally only used for the measurement of liquid flow, and its verification is usually done in the laboratory (flow standard device) and its specific conditions. This is what we usually call offline verification. We know that the verification purpose of the mass flowmeter is to determine the measurement performance of the meter in actual use. There are the following problems in laboratory verification: ①The verification medium is different from the actual measured medium, and its physical parameters are also different; ②The working conditions during the verification, such as temperature and pressure, are inconsistent with the application conditions of the flowmeter; ③The installation type of the flowmeter There are also big differences in the same field. Reasons why the mass flowmeter stops measuring when it is in use: 1. Oscillation. The introduction of the U-shaped double-pipe flowmeter design has greatly reduced, but it has not completely eliminated the impact of common-mode oscillation on the mass flowmeter, because the external oscillation introduced by the pipeline system can cause the sensor to oscillate in an undesired manner. If the external oscillation frequency is equal to or close to the frequency of the sensor drive system, it will interfere with the drive control system of the instrument, causing the flow tube to vibrate unstable or stop. 2. Sediment and suspended matter. Mass flow meters can calculate the mass content of one component in a two-component solution or slurry. The situation that must be avoided for accurate density measurement is: the sediment is attached to the measuring tube wall or the solid particles are deposited from the suspension, and the phenomenon of too low flow rate should be minimized. 3. Entrained air bubbles. When the flowmeter is used for liquid flow measurement, the mass flowmeter will stop working when the mist-like gas content reaches a certain volume content. These bubbles dampen the vibration of the measuring tube used to generate the Coriolis force and should eliminate the gas before the sensor. If this is difficult to achieve, minimize the gas content, i.e. increase the pressure in the sensor as much as possible, and keep the liquid flow rate high to ensure that the gas bubbles are evenly dispersed into smaller bubbles.

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