The Key Factors of Mass Flow Meters Leading to Measuring Errors

The key factors that lead to measurement errors of mass flowmeters are the influence of operating factors on (1) instrument parameters. Wrong flow coefficient, meter coefficient configured. (Problems occurred during the flowmeter verification process, such as: the accuracy of the standard scale decreased, the measurement medium contained gas, the valve leakage, etc.), the output signal did not match the range setting (during remote display). (2) Quantity and correction. Inappropriate unit of measure, low flow cutoff configured. (3) Zero point. Incorrect zeroing of flowmeter. (When zeroing, the medium in the measuring tube is not full, the medium is in a flowing state, and the medium is in a two-phase state) Performance impact (1) Sensor. Corrosion, wear, etc. of the flowmeter sensor lead to performance degradation. (2) Transmitter. Flowmeter transmitter components are aging. (3) Terminals. The cable inlet hole is not tightly sealed, causing water vapor to enter (causing zero drift or equipment damage). Process factors affect (1) gas-liquid two-phase. (2) The valve leaks. (3) Low pressure leads to gasification. (4) The operating flow rate changes too much. The influence of temperature on the sensor (1) The influence on the flow tube, the elasticity of the metal will change with the change of temperature. (2) The effect on the zero point of the sensor, all mechanical structures will be affected by temperature, due to the asymmetry of geometry and structure, the change of temperature amplifies this effect. The definition of this effect is the maximum deviation that may occur when the medium temperature is not consistent with the zeroing temperature. (3) The correction coefficients of flow tubes with different materials, shapes, and wall thicknesses are also different. The influence of temperature on the transmitter The definition of the influence of ambient temperature on the analog output is that every 1 °C deviation from the calibration temperature, the change is the span±0.005%. The influence of pressure on the sensor can increase the wall thickness of the flow tube to reduce the pressure influence. Increasing the wall thickness will reduce the sensitivity, and the reduction of sensitivity will reduce the measurement accuracy. Flow tube wall thickness must be optimized to ensure maximum performance.

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