Do Vibration and Electromagnetics Affect Mass Flow Meter Accuracy

In oil transfer, mass flowmeters are often used. Although the measurement of mass flowmeters is relatively accurate and reliable, there will be some abnormal phenomena in practical applications, which will bring unnecessary errors. Therefore, we need to analyze these abnormal phenomena. Economy reduces the influence of unfavorable factors. So what are the factors that affect the accuracy of the mass flowmeter? In the state of vibration, it is very sensitive to external vibration. If there are other vibration sources in the installation area of ​​the flowmeter, it will also affect the vibration frequency of the mass flowmeter and cause measurement errors. The best way is to avoid vibration interference, if it is unavoidable. , so that the flowmeter is isolated from the source of vibration interference. The second is the influence of electromagnetic interference on the accuracy of the mass flowmeter. Since the sensor vibrates the measuring tube through the excitation coil, if there is relatively large magnetic field interference near the working area of ​​the flowmeter, it will also affect the accuracy of the mass flowmeter. Affect the measurement results. The third is the influence of installation stress on the accuracy of the mass flowmeter. During the installation of the mass flowmeter, if the sensor flange of the flowmeter is not aligned with the central axis of the pipeline, the stress generated by the pipeline will also Deviations will occur. The gas mass flow sensor is based on the heat transfer principle that the heat taken away by the gas flowing through the sensor is proportional to its output voltage. The pressure sensor is that the gas pressure is proportional to the output voltage, that is, the gas mass flow and gas pressure are simultaneously converted into analog signals for output. The function of the digital display integrator is to convert the analog electrical signal output by the gas mass flow sensor into a digital signal through the A/D inside the single-chip microcomputer, and then convert the mass flow rate of the gas into the corresponding standard state gas after calculation and processing. The volumetric flow rate or the mass flow rate under the standard state are calculated by data processing and operation to calculate the real-time flow rate and cumulative flow rate respectively, and send them to the four-digit and eight-digit digital tubes for display. In addition, the single-chip microcomputer can store various calibration data, conversion coefficients, artificially set upper and lower limits of real-time flow, and accumulated flow data in the EEPROM of the single-chip microcomputer for storage. It can be automatically saved after power failure. , these data information can be restored automatically.

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