Basic knowledge of mass flow meters

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A mass flow meter is a measuring instrument that can accurately and directly measure the mass flow rate of fluid in closed pipelines. Its working principle is simple. The principle behind mass measurement in a Coriolis mass flow meter is Newton’s second law, F=Ma. When fluid flows through the vibrating tube, a Coriolis force is generated that is proportional to the mass flow rate. When no fluid is flowing, the vibrating tube does not twist, and the signals detected by the electromagnetic sensors on both sides of the tube are in the same phase ； When fluid flows through, the vibrating tube twists under the action of torque, resulting in a phase difference between the two detectors. The transmitter measures the time lag between the signals from these detectors; by multiplying this time difference by a flow calibration coefficient, the mass flow rate can be determined. The principle behind density measurement in Coriolis mass flow meters is that the vibration frequency is inversely proportional to the square root of the fluid density; the fluid density is determined by measuring this vibration frequency. Therefore, a mass flow meter can measure both the mass flow rate of a fluid and its density. Advantages of mass flow meters: 1. Mass flow meters have a relatively high range; generally, it can reach a ratio of 20:1 to 50:1, and some instruments even have a range of over 100:1 ； 2. Mass flow meters that can effectively perform direct measurement of flow rate, featuring high measurement accuracy and good stability ； 3. It can be used with a wide range of media; mass flow meters are suitable for measuring dirty natural gas ； 4. The mass flow meter can be effectively maintained and cleaned, thereby extending its service life further ； 5. Mass flow meters are particularly suitable for process control applications involving trade handover measurements.