Proper selection of vortex flowmeter

Vortex flowmeter, also known as vortex flowmeter or karman vortex flowmeter, is key to the flow measurement of material fluid mechanics in industrial pipelines.What should we pay attention to for the motor selection of vortex flowmeter?Today with the pegatron dashboard sister for everyone in detail.

Each flowmeter often has its available flow category, the general category ratio will be 20:1 up and down.One should not subjectively stipulate that it takes into account thoroughly the categories of traffic one sets.Appear such thing, ought to have take have shed, as far as possible often dosage falls in the common scope of the specification;In addition also have in specific application, if can encounter the temperature of material working pressure fluctuation is more at ordinary times, how to choose to use temperature, or use working pressure, still use temperature working pressure to compensate additionally, in order to exceed specific measure more accurate regulation.This conundrum can be analyzed in depth in that way:

Proper selection of vortex flowmeter

1. Investigate the range of traffic given first to see if it is valid.For example, the given high flow rate is based on whether the line of the specification exceeds the design standard, or whether the water flow rate in the matching pipe is too high.On the contrary, to be able to analyze, for the specification of the pipeline, such a small flow is not measured use value?The result of such discrimination is a fundamental preference for tending to small flows or for tending to large flows.

2. The next consideration is the difficulty of range ratio. Range ratio refers to the ratio between the precision given by a flowmeter and the larger flow rate that can be measured and the minimum flow rate within the linear range.However, people must be careful when it comes to the range ratio. Since the range ratio is based on the specific water flow, the larger allowable rate of the steam system software is 35m/s(the maximum measurement of steam and water flow in the flowmeter is 70m/ s), the higher flow rate will cause erosion and noise of the system software.However, the minimum allowable water flow of different flowmeters is different. Generally, the minimum vapor water flow measured by vortex flowmeters is about 3m/s. In view of insufficient range ratio, flowmeters with large range ratio should be selected.

3, if the analysis results, the flow category is not questioned, then generally choose the equivalent or lower than the pipeline specifications of the vortex flowmeter.That will ensure that the small flow can work properly.When the flow exceeds the limit a little, the dashboard still works fine, but the frictional resistance is more damaging.In general, the status of the super - gauge range is less in the industrial production field.The situation of too small flow is very extensive (therefore, when the motor selection, generally consider whether the low flow limit is more in line with the requirements).

4. Selection of compensation vortex street for temperature and pressure: nowadays, more and more trade meters are applied, and customers have higher and higher requirements on the application of the dashboard. At this time, two independent variables, temperature and working pressure, should be adopted to carry out immediate compensation adjustment for on-site measurement of the dashboard, so as to improve the actual measurement effect.In general, only one independent variable must be known for the measurement of saturated vapor, while two other independent variables must be known for saturated vapor and compressed air.Generally, in addition to the material's own temperature and working pressure base will not change, there is no need to carry out temperature and pressure compensation, other places (except material and liquid) are proposed to use temperature and pressure compensation, in order to improve the actual measurement effect.

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