Industry new

Factors Affecting the Accuracy of Mass Flow Meters - Focus on Microfluidic Control Technology

In the oil transfer, the mass flow meter is often used. Although the mass flow meter is accurate and reliable, there are some abnormal phenomena in the actual application, which bring unnecessary errors, so we need to analyze these anomalies. The economy reduces the influence of unfavorable factors. So what are the factors that affect the accuracy of the mass flowmeter? Xiaobian will tell the friends, the first is the influence of the accuracy of the vibration mass flowmeter, when the mass flowmeter works normally. The measuring tube is in a vibrating state and is very sensitive to external vibration. If there are other vibration sources in the flowmeter installation area, it will also affect the vibration frequency of the mass flow meter, causing measurement error. The best way is to avoid vibration interference. If it is unavoidable, let the flowmeter be isolated from the vibration interference source. The second is the influence of electromagnetic interference on the accuracy of the mass flowmeter. Because the sensor causes the measuring tube to vibrate through the excitation coil, if there is a relatively large magnetic field near the working area of the flowmeter. Interference also affects the measurement results. The third is the effect of mounting stress on the accuracy of the mass flow meter in the mass flow meter. Installation process, if the central axis of the sensor flow machine with duct flanges are not aligned, then the resulting stresses of variation will occur.
The gas mass flow sensor is based on the principle that the heat carried by the gas flowing through the sensor is proportional to the heat transfer of the output voltage. The pressure sensor is the pressure of the gas proportional to the output voltage, that is, the gas mass flow and the gas pressure are simultaneously converted into an analog signal output. The function of the digital display totalizer is to convert the analog electric signal outputted by the gas mass flow sensor into a digital signal through the A/D inside the single-chip microcomputer, and then perform the arithmetic processing to convert the mass flow rate of the gas into the corresponding standard state gas. The volume flow rate or the mass flow rate under the standard state is calculated by the data processing, and the instantaneous flow rate and the accumulated flow rate are respectively calculated and sent to the four-digit and eight-digit digital tube display. In addition, the MCU can store various calibration data, conversion coefficients, and manually set up, lower limit and accumulated flow data information in the EEPROM in the EEPROM for permanent storage. After power failure, it can be automatically saved and re-powered. After that, the data information can be automatically restored.

PREVIOUS：How to choose a mass flow meter? - Focus on mNEXT：Is the measurement mass flow selected from a