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Industry Information
Verification methods commonly used in vortex flowmeters
2011-10-8 10:02:36

标准表法 First , the standard table method
   涡街流量计 作标准器与被检 流量计 进行 串联,可 用静态法或 动态法检定。 The vortex flowmeter is used as a standard device to be connected in series with the flowmeter to be tested, and the static method or the dynamic method can be used for verification. 得出 被检涡街流量计 误差。 By comparing the readings of the two flow meters , the error of the tested vortex flowmeter is obtained .
如下 The characteristics of the standard meter flowmeter standard device are as follows :
流体, 同时 也适用于各种粘度的液体。 1. The standard meter device is suitable for measuring a variety of liquids and gases , but also for liquids of various viscosities.
进行示值检定 ,作为标准表的流量计与被检流量计串联安装于同一个封闭管道系统中,一般 没有 时间测量误差。 2. When performing the indication verification , the flow meter as a standard meter and the flow meter under test are installed in the same closed pipeline system in series, and generally there is no time measurement error.
流量计 类相同,也可以不同。 3. As a standard meter, the vortex flowmeter can be the same as or different from the flowmeter being tested .
可以不 切断气流或 液流, 因此 适宜于在线检定, 同时 也适用于作密闭管路的计量标准器。 4. It is not necessary to cut off the air flow or liquid flow when verifying the flow meter by the standard meter method , so it is suitable for online verification, and it is also suitable as a measurement standard for closed pipelines.
5. The standard table method is easy to realize automation, sealed and safe, and does not pollute the environment.
    比较容 易,成本较低。 6. Small size, light weight, simple device structure, convenient operation, easy transportation and installation , and low cost.
    较差, 常需要定期或 不定期 进行比对,以监督 它的 计量性能。 7. The standard meter has a low accuracy and poor stability . It is often necessary to compare it regularly or irregularly to monitor its measurement performance. The calibration cycle of the standard table is short.
钟罩法 Second , the bell jar method
   形如钟罩的开口容器,倒放入装有密封液体(水或 其它液体)的上开口圆筒形储液槽内。 Pour an open container shaped like a bell jar into an upper-opening cylindrical liquid storage tank containing a sealing liquid (water or other liquid). 钟罩是浮在密封液体中 而且 钟罩内的容积已知, 因此 在测量时间间隔内,测量钟罩上升或 下降时吸入或 排出 气体体积量,可 以得出 气体流量。 Because the bell jar is floating in a sealed liquid and the volume inside the bell jar is known, the volume of gas that is drawn or discharged when the bell jar rises or falls during the measurement interval can be calculated .

装置。 Bell jar method is a volumetric gas flow meter . ,可以采用进气方式或 排出方式两种检定方法。 When the bell cup method is used for the verification of the vortex flowmeter , there are two methods of verification: intake method and exhaust method. 进气方式工作压力高于钟罩余压 的时候 ,流量较大。 When the working pressure of the air intake mode is higher than the residual pressure of the bell jar , the flow is large. 排气方式工作压力小于钟罩余压 的时候 ,流量较小。 When the working pressure of the exhaust mode is less than the residual pressure of the bell jar , the flow is small.

两种方 There are two types of bell cover: water seal and oil seal . 水封式 钟罩, 如果 用排气方式检定流量计,被检流量计的温度低于钟罩内的水温 应该 要考虑空气中的水蒸汽结露而产生的误差。 For a water-sealed bell jar, if the flow meter is calibrated by exhaust, the error caused by condensation of water vapor in the air should be considered when the temperature of the meter being tested is lower than the temperature of the water in the bell jar .
一般 用于计量接近大气压力的空气流量计。 The bell method is generally used to measure air flow meters close to atmospheric pressure. Gas meters and wet gas flowmeters are commonly used for this method. The flow range is relatively small, and flowmeters with an upper limit of 3000-5000 m3 / h can be verified .