Differential pressure flow meter scale in the full range of less than 30% of the applications

Abstract: differential pressure flowmeter scale in the full scale application of less than 30% of the information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Field staff may know a lot of process, standard throttle device 30% should not be used, under the full scale range than the more appropriate is 3:1, if too much, seriously affect the accuracy. Although now a lot of differential pressure flowmeter range than can do a lot. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a differential pressure type flowmeter scale in the full range of less than 30% of the details in this paper. Field staff may know a lot of process, standard throttle device 30% should not be used, under the full scale range than the more appropriate is 3:1, if too much, seriously affect the accuracy. Although now a lot of differential pressure flowmeter range than can do much, as they are now more widely used V cone flowmeter can do it now, and is good at measuring the wedge of smudgy medium flow meter range than larger, can do it now, these products directly to make up for the standard throttle device measuring range than the disadvantages. So why throttling device measuring site traffic, only such a small flow? Study its principle, and you it's not hard to find, it is main or flow calculation formula determined by the throttle device, the following will give you detailed introduce the reason: the flow measurement, the applicable national standards: the throttle device of flow ratio is 30% ( Namely zui big traffic: zui small flow = 3:1) , here because of the square of the differential pressure and flow rate ratio, flow ratio is below 30%, the precision can't guarantee, in addition, the flow rate is lower than 30%, the Reynolds number is often lower than line Reynolds number, flow coefficient & alpha; Is not constant, the flow measurement is not allowed. So how to deal with this situation. 1. First and technological personnel to negotiate lower zui big traffic, such as the Reynolds number is large enough, then you can through the orifice or differential pressure to solve 2 instead. To switch to other differential pressure flowmeter, if meet the scope of parameters do not change the flow range and working conditions on site a lot of time, we can choose V cone flowmeter, V cone flowmeter was filled with a wide range of application at present, the main features are: high precision, wide range, small pressure loss, save energy, and for the corrosive medium, can choose wedge flowmeter, main characteristic: the lower limit of low Reynolds number, wide application range, good stability. 3. For the field of large diameter measurement, from economic, installation to consider, can choose insert type differential pressure flowmeter, such as: pig velocity-equalizing tube flowmeter, plug-in double venturi, plug-in V cone flowmeter, etc, these instrument in the measurement of large diameter, they have absolute advantages, first is of low cost, simple installation, more important is to guarantee the field measurement results. Either a flowmeter, has its limitations, we should be through other ways to make up for the deficiency. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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