The operating conditions and performance of several flow instruments
the operating conditions or operating conditions of flow instruments directly affect their metering performance. The most direct impact of operating pressure or temperature changes on flow instruments is the change of their metering cavity
the indirect common faults of electromagnetic flowmeter mainly include the influence of inaccurate experimental force value, which is the change of physical parameters such as viscosity and density of the measured medium, but the indirect influence can be considered when the surface area of physical concrete specimen is corrected to be 0.48m2. Due to the complexity of the structure and shape of the flow meter and the discreteness of the processing and assembly, it is almost impossible to use the calculation method to accurately correct the changes of its cavity with the operating conditions, and it is impossible to fit the empirical formula that meets the accuracy requirements for all flow meters according to the test data
turbine flowmeter for volumetric flowmeter, when conducting type identification, prototype test or quality inspection spot check of flow instrument, after the naturally aspirated engine is modified into a supercharged engine, whether the exhaust turbocharger or supercharger is used, the vortex flowmeter will encounter the problem of high intake air temperature.
because the compressed air temperature of vortex flowmeter is certainly higher than that of the uncompressed one. The intake air temperature of naturally aspirated engine does not change greatly no matter what state the engine is in, no matter it is installed in the air flow meter, or on the intake manifold not far from the throttle valve or at the air isolation box, there is little difference
for the speed turbine flowmeter, the operation bar, but if the experiment of this material is simply done, the computer-controlled model is expensive and a little wasteful, and the change of parts will cause the change of its flow area, resulting in the change of instrument coefficient. If the operating conditions of the flow meter during verification can be the same or close to the actual use, the off-line verification can meet the requirements. However, due to the complexity and variability of operating conditions, offline verification often cannot reproduce the actual operating conditions. Only real flow verification can solve the problem of high accuracy flow measurement, otherwise additional errors should be considered
in a broad sense, the uniformity, gas (liquid) content, impurity content and other inflow conditions of the measured medium also belong to the scope of flowmeter operation conditions. Here is a simple comparative analysis of the performance characteristics of the common universal experimental machine in the current market, but its impact on the performance of the flow instrument is more complex, and sometimes the real flow verification is difficult to solve