Vortex flow meter measurement selection factors

Abstract: The information on the measurement selection factors of the vortex flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. Vortex flowmeter needs to consider many aspects when selecting and measuring, such as: performance, fluid characteristics, installation specifications, environmental impact, etc. The measurement method and selection considerations are discussed in detail below. 1. Performance requirements and instrument specifications. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the measurement selection factors of vortex flowmeters. Vortex flowmeter needs to consider many aspects when selecting and measuring, such as: performance, fluid characteristics, installation specifications, environmental impact, etc. The measurement method and selection considerations are discussed in detail below. 1. Factors in performance requirements and instrument specifications After considering the vortex flowmeter to determine the measurement method, for the selected flow meter, the performance requirements that need to be considered include the following aspects: *, measured flow or total amount; The measurement of the flow and the measurement of the total amount are the two main purposes of the measurement of the object; for example, for the continuous proportioning production of pipelines or process control, the main measurement of the place of use is the instantaneous flow, while for the commercial accounting In terms of storage and transportation distribution, the main measurement of its use site is the total amount; second, accuracy; usually the accuracy level locked by the flow meter specification can be applied to a relatively wide flow range; third, repeatability; An important indicator in process control applications is repeatability, which is determined by the manufacturing quality of the instrument itself and its own principle; fourth, linearity; linearity and square root nonlinearity, which are the two main outputs of flow instruments, For most flow instruments, the nonlinear error is regarded as a component of the basic error, rather than being listed as a separate indicator; fifth, the upper limit flow and flow range; the so-called upper limit flow is usually referred to as the full-scale flow. , For the selection of the diameter of the flow meter, the diameter of the pipeline cannot be used for simple matching. It should be selected according to the upper and lower limit flow and flow range of the selected meter; sixth, the range; The ratio of the lower limit flow rate is the range degree, and its value is positively related to the flow range. Generally, the range degree of linear instruments is relatively large, while the range degree of nonlinear instruments is relatively small; seventh, pressure loss; for most flow sensors For example, when the flow direction is changed, or the static setting is set in its flow channel, there will be a pressure loss that changes with the flow and cannot be recovered; eighth, the output signal characteristics; the output that plays a decisive role in the selection of the instrument is the output. The factor of signal; ninth, response time; if the flow meter is applied to a pulsating flow place, the response time of the flow step change should be tested; tenth, maintainability; Disassembly for maintenance is cumbersome and time-consuming, so the factor of maintainability must be carefully considered. 2. Considering the factors of fluid characteristics The process department conducts investigations and visits to further verify the adaptability of the selected scheme; for the fluid category, there are many fluid properties to be considered, which can be summarized as follows: 1) temperature; 2) pressure; 3) density; 4) viscosity; 5) lubricity; 6) corrosiveness; 7) abrasiveness, etc.; in addition, for individual sites, relevant hygiene requirements must also be taken into account; for individual measurement methods, relevant The special parameters of the fluid characteristics must also be considered, such as the application of electromagnetic flowmeters, the relevant knowledge of the conductivity of the liquid must be carried out. Various parameters related to the physical properties of the fluid will have different effects on various flow instruments. Therefore, the selection of the flow instrument to be selected is largely dominated by the physical properties of the fluid. Therefore, for the selected flow instrument or measurement method In terms of fluid properties, it is not only necessary to adapt to the properties of the fluid to be measured, but also to be able to adapt to the amount of influence caused by the change of a certain parameter of the fluid's physical properties during the measurement process. The various parameters of the fluid under the conditions of use and the technical specification adaptability of the selected instrument can usually be found in the evaluation manual; for those who do not know the exact composition of the fluid, the relevant users must take the initiative to consult the manufacturer. , to confirm whether the selected instrument can be used normally. 3. Installation factors Considering the different principles of the vortex flowmeter measurement method, there are very different installation requirements.

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