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The influence of external conditions on the operation of flow meters

by:Sure     2021-08-11
The performance of the flow meter is directly affected by external conditions. Different external conditions will affect various operations, so that the correct data cannot be obtained. Several aspects are summarized for your reference: Temperature change or operating pressure affects the flow rate The most direct effect of the meter is to change its metering cavity. For the speed turbine flowmeter, the performance of the electronic balance low-temperature coolant circulation pump flow meter is directly affected by external conditions. Different external conditions will affect various operations, so that correct data cannot be obtained. Several aspects are for your reference: The most direct effect of temperature change or operating pressure on a flow meter is to change its metering cavity. For speed turbine flowmeters, changes in the operating conditions of the electronic balance low-temperature coolant circulation pump will cause changes in its flow area, which will lead to changes in the meter coefficient. If the operating conditions of the flow meter during verification can be the same as or close to those in actual use, the 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. 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 changes in operating conditions, and it is impossible to correct the cavity according to the changes in the operating conditions. The data fits an empirical formula that meets the accuracy requirements for all flow meters. Broadly speaking, the incoming flow conditions such as the uniformity of the measured medium, the impurity content, the gas (liquid) content of the electronic balance, etc., also belong to the scope of the flow meter operating conditions, but its impact on the performance of the flow meter is more complicated, and sometimes Online real-flow verification is also difficult to solve. Turbine flowmeter For positive displacement flow meters, the naturally aspirated engine is converted to supercharged during the type appraisal of flow meters, metal sleeve thermometers, marine thermometers, V-type thermometers, copper sleeve thermometers prototype test or quality inspection spot checks. After the engine, whether it is an exhaust gas turbocharger or a supercharger, it will encounter the problem of high intake air temperature. Because the air temperature of the vortex flowmeter after compression is definitely higher than that of the uncompressed air. The intake temperature of the naturally aspirated engine of the oven does not change much regardless of the state of the engine, whether it is installed in the air flow meter, the oven or the intake manifold not far from the throttle or at the air compartment, They are not much different.
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