天津压力表变送器,涡街流量计的精度有多少?-西安华恒变送器厂家
天津压力表变送器,涡街流量计的精度有多少?
信息来源: 华恒 | [ 2019-05-21 ] 点击量: 265

   涡街流量计作为工业现场普遍使用的流量仪表,可以测量气体液体流量,相比其他流量计的适用的范围更加广泛,涡街流量计的精度也是比较高的从0.5-2级的都是可以的,所以对于部分有计量要求的甚至都可以用,涡街流量计适用的工况大家也要清楚,每种工况对于精度的实现也是不一样的。

 
  Vortex flowmeter,as a flow meter widely used in industrial field,can measure the flow of gas and liquid.Compared with other flowmeters,it has a wider scope of application.The accuracy of Vortex flowmeter is higher from 0.5 to 2 level.So it is possible to use some flowmeters even if they have measurement requirements.The working conditions of Vortex flowmeter should be clear,and each working condition is right.The realization of accuracy is also different.
 
  涡街流量计的精确度
  Accuracy of Vortex Flowmeter
 
  涡街流量计的精确度对于液体大致在±0.5%R~±2%R,对于气体在±l%R~±2%R,重复性一般为0.2%~0.5%。由于涡街流量计的仪表系数较低,频率分辨率低,口径愈大愈低,故仪表口径不宜过大(DN300以下)。
 
  The accuracy of the vortex flowmeter is about(+)0.5%R to(+)2%R for liquid and(+)l%R to(+)2%R for gas.The repeatability of the vortex flowmeter is generally 0.2%-0.5%.Because the instrument coefficient of vortex flowmeter is low,the frequency resolution is low and the caliber is larger and lower,the caliber of instrument should not be too large(below DN300).
 
  范围度宽是涡街流量计的特点,但重要的是下限流量为多少。一般液体平均流速下限为0.5m/s,气体为4~5m/s。涡街流量计的正常流量最好在正常测量范围的1/2~2/3处
 
  Wide range is the characteristic of vortex flowmeter,but what matters is the lower limit flow rate.The lower limit of average liquid velocity is 0.5m/s and gas velocity is 4-5m/s.The normal flow rate of vortex flowmeter should be 1/2-2/3 of the normal measurement range.
 
  适用的情况
  Applicable circumstances
 
  涡街流量计不适用于测量低雷诺数(ReD≤2×104)流体。低雷诺数时斯特劳哈尔数随着雷诺数而变,仪表线性度变差,流体粘度高会显著影响甚至阻碍旋涡的产生,选型的一个限制条件是不能使用于界限雷诺数之下。涡街流量计适用的流体比较广泛,但对于流体的脏污性质要注意。含固体微粒的流体对旋涡发生体的冲刷会产生噪声,磨损旋涡发生体。若含有的短纤维缠绕在旋涡发生体上将改变仪表系数。
 
  Vortex flowmeter is not suitable for measuring low Reynolds number(ReD<2*104)fluid.When Reynolds number is low,Strauhal number varies with Reynolds number,instrumentation linearity becomes worse,and high fluid viscosity will significantly affect or even hinder the generation of vortices.One of the limitations of type selection is that it can not be used under the bounded Reynolds number.Vortex flowmeters are widely used for fluids,but attention should be paid to the fouling properties of fluids.The fluids containing solid particles will produce noise and wear whirlpool when they scour the whirlpool.The instrument coefficients will be changed if the short fibers are wound around the vortex generator.
 
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