Common Error Solutions of Differential Pressure Flow Meter System

Abstract: The information on common error solutions of differential pressure flow meter system is provided by excellent flow meter and flow meter manufacturers and quotation manufacturers. If no correction is made, the flow result qvn calculated in this way is too small. Due to the error of the measuring instrument and the situation that the on-site use conditions do not fully meet the specifications, it is inevitable that the error brought by it often affects the settlement of metering trade. The common errors are analyzed below. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the article on common errors in differential pressure flowmeter system. If no correction is made, the flow result qvn calculated in this way is small. Due to the error of the measuring instrument and the situation that the on-site use conditions do not fully meet the specifications, it is inevitable that the error brought by it often affects the settlement of metering trade. The common errors are analyzed below. That is, the maximum flow rate and minimum flow rate used to calculate the aperture of the orifice deviate from the actual maximum flow rate and minimum flow rate of the user, and the user's gas consumption is not accurately grasped. This causes the calculated aperture of the orifice plate to be larger, resulting in errors. The AvnCEFGεFZFT constant is now based on the formula used in the SY/T61432004 natural gas flow measurement method: qvn=AvnCEd2FGεF2FTP1△P analysis: under the condition of constant pressure, temperature and composition. The differential pressure measurement range is unchanged, the variables are d and △P△P are small, and the large orifice flowmeter measures small flow. This makes the differential pressure gauge work below 10% of the range, which is not in line with the requirements of SY/T61432004, that is, the differential pressure value should work within the range of 10% and 90% of the full range. In particular, the erosion and corrosion of the right-angle inlet edge of the orifice plate and the inner wall of the straight pipe section are particularly serious. The manufacture and installation of the 2-orifice plate flowmeter should meet the requirements of SY/T61432004 before it can be put into use. The orifice plate is subject to different levels of gas erosion and corrosion during use. This will affect the arc radius rk of the right-angle inlet edge of the orifice plate and the arithmetic mean deviation Ra of the inner and outer surface roughness of the straight pipe section. The outflow coefficient C will change, and the uncertainty of the flow measurement will exceed the estimated value. In order to prevent this error, replace the new orifice plate and the new straight pipe section. If you want to continue to use it, you can calculate the rk and Ra to correct the outflow coefficient before use. The correction method is: multiply the original outflow coefficient C by the orifice sharpness coefficient bk and roughness coefficient rRe, or multiply bk and rRe at the same time, that is, C′=CbkrRe The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Solution to Common Errors of Differential Pressure Flow Meter System'

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