The application of differential pressure flow meter below 30% of full scale

Abstract: The application information of differential pressure flowmeter below 30% of full scale is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Many technicians in the field may know that the standard throttling device should not be used at 30% of the full scale. The suitable range ratio is 3:1. If it is too large, it will seriously affect the accuracy. Although many differential pressure flowmeters have a large turndown ratio. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the application article details of differential pressure flowmeters below 30% of the full scale. Many technicians in the field may know that the standard throttling device should not be used at 30% of the full scale. The suitable range ratio is 3:1. If it is too large, it will seriously affect the accuracy. Although many differential pressure flowmeters can achieve a large range ratio, such as the widely used V-cone flowmeter can achieve 13:1, and the wedge flowmeter, which is good at measuring dirty media, has a larger range ratio. 15:1 can be achieved, these products directly make up for the insufficiency of the small measurement range ratio of the standard throttling device. So why is there only such a small flow rate when the throttling device measures the on-site flow? It is not difficult to find out by studying its principle, which is mainly determined by the flow calculation formula of the throttling device. Reason: In flow measurement, the national standard stipulates that the applicable flow ratio of the throttling device is 30% (that is, the maximum flow: minimum flow = 3:1). Here, because the differential pressure is proportional to the square of the flow, the flow ratio is lower than 30. %, the accuracy cannot be guaranteed. In addition, when the flow rate is lower than 30%, the Reynolds number is often lower than the limit Reynolds number, and the flow coefficient isαIt is not a constant, resulting in inaccurate flow measurement. So how to deal with such a situation. 1. First negotiate with the technician to reduce the maximum flow rate. If the Reynolds number is large enough, it can be solved by changing the orifice plate or differential pressure. 2. Use other differential pressure flow meters. When the measuring range is very large, we can choose the V-cone flowmeter. The V-cone flowmeter is currently widely used. The main features are: high precision, large measuring range, small pressure loss, and energy saving. For corrosive media, wedge flowmeter can be used. The main features are: low Reynolds number lower limit, wide application range and good stability. 3. For on-site measurement of large diameters, from the perspective of economy and installation, plug-in differential pressure flowmeters can be selected, such as: Annubar average velocity tube flowmeter, plug-in double Venturi, plug-in V-cone Flowmeters, etc., these instruments have absolute advantages when measuring large diameters. First of all, they are low in cost, simple in installation, and more importantly, they can ensure the effect of on-site measurement. No matter which flowmeter it is, it has certain limitations, and we should make up for its deficiencies through other methods. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Application of Differential Pressure Flow Meter Below 30% of Full Scale'

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