Working principle of mass flowmeter and precautions to be avoided during use

The working principle of the mass flowmeter and the precautions to be avoided during the use of the mass flowmeter When the mass flowmeter measures the fluid flowing in the rotating tube, it will generate a force on the tube wall. It was discovered by Coriolis in 1832 when he was studying the water turbine, referred to as Coriolis force. The mass flowmeter is based on the Coriolis force, in the sensor'>There are two parallel T-shaped vibrating tubes inside the sensor, with a driving coil in the middle and a pickup coil at both ends. When the excitation voltage provided by the transmitter is applied to the driving coil, the vibrating tube vibrates periodically in a reciprocating cycle. , the fluid medium in the industrial process flows through the vibrating tube of the sensor, which will produce a Coriolis force effect on the vibrating tube, causing the two vibrating tubes to vibrate torsionally, and the pickup coils installed at both ends of the vibrating tube will generate two sets of signals with different phases , the difference between these two signals is proportional to the mass flow rate of the fluid passing through the sensor. The computer calculates the mass flow through the vibrating tube. When different media flow through the sensor, the main vibration frequency of the vibrating tube is different, and the density of the media is calculated accordingly. The platinum resistance installed on the vibration tube of the sensor can indirectly measure the temperature of the medium. Therefore, we should avoid the following events during the measurement process: 1. The rigidity and stress-free support of the sensor 2. Avoid installing the sensor at the highest position of the pipeline, because the air bubbles will gather and stay, causing measurement errors in the test system; 3. If the excessively long downstream pipeline (generally not greater than 3M) ​​cannot be avoided, an additional flow valve should be installed; 4. The distance from the delivery pump should be at least 4 times the length of the sensor itself (the distance between the two flanges). If the pump Unnecessary vibrations must be isolated with coils or connecting pipes. 5. Additional devices such as regulating valves and inspection windows should be installed at least 1X away from the sensor.“L”Far away (L is the distance between the sensor mounting flanges) 6. The bracket cannot be installed on the flange or the shell, and the distance from the flange is generally 20~200mm;

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