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Relevant knowledge in the operation of vortex flowmeters
2011-9-8 9:43:38

日常 使用过程中 涡街流量计 存在的问题主要有: 1) 指示 长期不准 2) 指示 不回 3) 指示大范围波动, 没办 法读数; 4) 始终 没有 指示; 5) 大流量时指示还可以, 小流量时指示不准 6) 小流量时 没有 指示; 7) 流量变化时指示变化跟不上 变化 8) 仪表系数无法确定,多处资料均不一致。 In the daily use process , the main problems of the vortex flowmeter are: ( 1) the indicated value is not accurate for a long time ; ( 2) the indicated value does not return to zero ; ( 3) the indication has a wide range of fluctuations, and there is no way to read; ( 4) There is no indication at all times ; ( 5) The indication is OK at large flows, but the indication is not accurate at small flows ; ( 6) There is no indication at small flows ; ( 7) The indication changes cannot keep up with the changes in flow ; ( 8) ) The meter coefficient cannot be determined, and the data are inconsistent.   
      
问题的主要原因, 可能 涉及到以下 方面: The main reasons for the above problems may involve the following three aspects:   

由于工艺条件变动 ,某些 涡街流量计在口径选型上或者在设计选型之后,选择大 些的一 个规格, 实际选型应 选择尽可能小的口径, 以提高测量精度,这方面的原因主要同 上述 问题 1) 3) 5) 有关。 1. In terms of selection of vortex flowmeters : due to changes in process conditions , some vortex flowmeters choose a larger size on the caliber selection or after design selection , and the actual selection should be as much as possible The small diameter is used to improve the measurement accuracy. The reasons for this are mainly related to the above problems ( 1) , ( 3) , ( 5) . 可以 供几个设备使用, 由于工艺部分设备有时候 停止 使用,造成实际使用流量 减小, 原设计选型口径过大,相当于提高了可测的流量下限, 因此 工艺管道 小流量时指示无法保证,流量大时还可以使用 For example, a vortex street pipeline can be designed for several equipments, but because the process equipment is sometimes stopped , the actual flow rate is reduced, and the original design is too large, which is equivalent to increasing the measurable flow rate. Lower limit, so the indication cannot be guaranteed when the flow rate is small in the process pipeline , and it can be used when the flow rate is large . ,因此 工艺条件的变动只是临时的。 It is sometimes too difficult to rebuild , so changes in process conditions are only temporary. 结合参数的重新整定以提高指示准确度。 Can be combined with parameter re-tuning to improve the indication accuracy.   

      2   传感器前面的直管段长度 如果 不够, 影响测量精度,这方面的原因主要同问题 1) 有关。 Vortex flowmeter installation : if the length of the straight pipe section in front of the sensor is not enough, it will affect the measurement accuracy. The reason for this is mainly related to problem ( 1) . 看出 明显 不足, 由于FIC203 不用于计量,仅仅 用于控制, 因此 目前的精度可以使用相当于降级使用。 For example, the straight pipe section in front of the sensor shows obvious shortcomings, but since FIC203 is not used for measurement, it is only used for control, so the current accuracy can be used equivalent to degraded use.

     3. Reason for parameter setting direction. 由于参数错误, 那么 导致仪表指示有误. If the parameter is wrong, the instrument indication is wrong. 使得二次仪表满度频率计算错误,这方面的原因主要同问题 1) 3) 有关。 The parameter error will cause the calculation of the secondary meter full-scale frequency to be incorrect. The reason for this is mainly related to problems ( 1) and ( 3) . 使得指示长期不准, 实际满度频率大 计算的满度频率的使得指示大范围波动, 没有办 法读数,而资料上参数的不一致性又影响了 Similar full-scale frequency will make the indication inaccurate for a long time, but the actual full-scale frequency is greater than the calculated full-scale frequency, which will cause the indication to fluctuate widely. There is no way to read it.   Vortex flowmeter parameters .