Principle of mass flow meter to measure density

Principle of mass flowmeter to measure density Can mass flowmeter measure density? The answer is yes. The principle is explained below. One end of the flow tube is fixed, while the other end is free. This structure can be regarded as a weight/spring system composed of a weight suspended on a spring. Once a movement is applied, the weight/spring system will vibrate at its resonant frequency, which is the same as the resonant frequency of the weight. quality is concerned. The flow tube of the mass flowmeter vibrates at its resonant frequency through the driving coil and the feedback circuit. The resonant frequency of the vibrating tube is related to the structure, material and quality of the vibrating tube. The quality of the vibrating tube consists of two parts: the quality of the vibrating tube itself and the quality of the medium in the vibrating tube. After each sensor is produced, the quality of the vibrating tube itself is determined. The mass of the medium in the vibrating tube is the product of the density of the medium and the volume of the vibrating tube, and the volume of the vibrating tube is fixed for each caliber sensor, so the vibration frequency is directly related to the density. Then, for determining the structure and For material sensors, the density of the medium can be obtained by measuring the resonant frequency of the flow tube. A pair of signal detectors used for flow measurement can obtain a signal representing the resonant frequency. A temperature sensor signal is used to compensate for changes in flow tube rigidity caused by temperature changes. The vibration period is measured by measuring the vibration period of the flow tube and The temperature is obtained, and the measurement of the medium density utilizes the linear relationship between the density and the vibration period of the flow tube and the standard calibration constant. When the mass flow sensor vibrates the tube to measure the density, the rigidity of the pipeline, the geometric structure and the quality of the fluid flowing through together determine the natural frequency of the pipeline device, so the fluid density can be deduced from the measured pipeline frequency. The transmitter uses a high-frequency clock to measure the time of the vibration cycle. The measured value is digitally filtered. After compensating for the change of the natural frequency caused by the change of the pipeline rigidity caused by the operating temperature, the sensor density calibration coefficient is used to calculate the process fluid density. .

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