1. Selection issues. 在口径选型上或者在设计选型之后由于工艺条件变动，使得选择大了—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问题①、③、⑥有关。 Some vortex flowmeters have a larger size in the selection of the caliber or after the design selection due to changes in process conditions. The actual selection should choose the smallest caliber as possible to improve the measurement accuracy. The main reason for this is Related to questions ①, ③, ⑥. For example, a vortex street pipeline is designed to be used by several equipments. Because the process equipment is sometimes not used, the current actual flow rate is reduced. The actual use causes the original design to be selected too large, which is equivalent to increasing the measurable flow rate. Lower limit, the indication cannot be guaranteed when the process flow is small, and the vortex flowmeter can be used when it is large, because it is sometimes too difficult to rebuild. Changes in process conditions are only temporary. Can be combined with parameter re-tuning to improve the indication accuracy.
2. Installation problems. The main reason is that the length of the straight pipe section in front of the vortex flowmeter is not enough, which affects the measurement accuracy. The reason for this is mainly related to problem ①. For example, the straight pipe section in front of the sensor is obviously insufficient. Since FIC203 is not used for metering, it is only used for control, so the current accuracy can be used equivalent to degraded use.
3. Reason for parameter setting direction. 指示有误． Due to the wrong parameters, the indication of the vortex flowmeter is incorrect. The parameter error causes the secondary meter full-scale frequency to be calculated incorrectly. The main reason for this is related to problems ① and ③. The full-scale frequency is similar, which makes the indication inaccurate for a long time. The full-scale frequency calculated by the actual full-scale frequency makes the indication fluctuate widely and cannot be read. The inconsistency of the parameters on the data affects the final determination of the parameters. Re-calibration combined with mutual comparison determined the parameters and solved this problem.
4. Secondary instrument failure. There are many faults in this part, including: there is a disconnection in the circuit board of the vortex flowmeter, the individual bit display of the range setting is bad, and the individual K bit setting is bad, making it impossible to determine the range setting and the K factor setting. This part of the problem is mainly related to questions 1,2. The problem was resolved by fixing the corresponding fault.
5, four-way line connection problems. 这部分原因主要同问题2有关。 Some circuits look good on the surface of the circuit. Carefully check that some connectors are actually loose and cause the circuit to be interrupted. Although some connectors are tightly connected, due to the problem of the auxiliary line, the fastening screws are fastened to the wire cover, which also makes the circuit The cause of the interruption is mainly related to question 2.