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Flow meter operating conditions

by:Sure     2021-08-10
The operating conditions or operating conditions of a flow meter directly affect its measurement performance. The most direct impact of operating pressure or temperature changes on the flow meter is the change of its metering cavity. The indirect influence of the electromagnetic flowmeter is the change of the measured medium viscosity, density and other physical parameters, but the indirect influence can be considered when correcting the physical influence. Due to the complexity of the structure and shape of the flow meter and the operating conditions or operating conditions of the processing flow meter directly affect its measurement performance, the most direct impact of the operating pressure or temperature change on the flow meter is the change of its metering cavity. The indirect influence of the electromagnetic flowmeter is the change of the measured medium viscosity, density and other physical parameters, but the indirect influence can be considered when correcting the physical influence. Due to the complexity of the structure and shape of the flow meter and the discreteness of processing and assembly, it is almost impossible to use calculation methods to accurately correct the cavity with the changes in operating conditions, and it is impossible to fit all flow meters based on test data. An empirical formula that meets the accuracy requirements. Turbine flowmeter For positive displacement flowmeters, in the type appraisal, prototype test or quality inspection of flow meters, after the naturally aspirated engine is converted into a supercharged engine, whether it is an exhaust gas turbocharger or a mechanical Superchargers will encounter the problem of high intake air temperature. Because the compressed air temperature of the vortex flowmeter is definitely higher than that of uncompressed air. The intake air temperature of a naturally aspirated engine does not change much regardless of the state of the engine, whether it is installed in an air flow meter, or on the intake manifold not far from the throttle valve or at the air compartment. Not much; For speed turbine flowmeters, changes in operating conditions will cause changes in its flow area, which will lead to changes in meter coefficients. If the operating conditions of the flow meter during verification can be the same or close to those in actual use, offline verification can meet the requirements. However, due to the complexity and variability of operating conditions, offline verification often cannot reproduce actual operating conditions. Only online real-flow verification can solve the problem of high-accuracy flow measurement, otherwise additional errors must be considered.
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