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Technical method of vortex flowmeter

by:Sure     2021-08-04
Vortex flowmeters are mainly used for flow measurement of industrial pipeline fluids, such as gases, liquids, vapors and other media. By setting a triangular column vortex generator in the fluid, regular vortices are alternately generated from both sides of the vortex generator, and the vortex arrays are arranged asymmetrically downstream of the vortex generator. The common problems of vortex flowmeter mainly include: 1. The indication is not accurate for a long time; 2. The vortex flowmeter is mainly used for the flow measurement of industrial pipeline fluid, such as gas, liquid, vapor and other media. By setting a triangular column vortex generator in the fluid, regular vortices are alternately generated from both sides of the vortex generator, and the vortex arrays are arranged asymmetrically downstream of the vortex generator. The common problems of vortex flowmeters mainly include: 1. Long-term inaccuracy of indication; 2. No indication at all times; 3. Large range of indication fluctuates and unable to read; 4. The indication does not return to zero; 5. There is no indication when the flow rate is small; 6. Large The indication is ok at the flow rate, but the indication is not accurate at the small flow rate; 7. The indication change cannot keep up when the flow rate changes; 8. The K coefficient of the instrument cannot be determined, and the data in many places are inconsistent. Summarizing the main reasons for these problems, mainly related to the following aspects:   1, the selection of the problem. Some vortex sensors have a larger selection in diameter selection or after design selection due to changes in process conditions. The actual selection should be as small as possible to improve measurement accuracy. The reasons for this are mainly the same. Questions ①, ③, and ⑥ are related. For example, a vortex pipeline is designed to be used by several equipment. Because some equipment in the process is sometimes not used, the current flow rate in actual use is reduced. The actual use causes the original design to select a diameter that is too large, which is equivalent to an increase in the measurable flow rate. The lower limit is not guaranteed when the process pipeline has a small flow rate, and it can be used when the flow rate is large, because it is sometimes too difficult to rebuild. Changes in process conditions are only temporary. It can be combined with the re-tuning of the parameters to improve the accuracy of the indication.  2. Problems with installation. The main reason is that the straight pipe section in front of the sensor is not long enough, which affects the measurement accuracy. The reason for this is mainly related to the problem ①. For example, the straight pipe section in front of the sensor is obviously insufficient. Since FIC203 is not used for measurement, but only for control, the current accuracy can be used equivalent to degraded use.   3. The reason for the parameter setting direction. Due to the parameter error, the indicator indication is wrong. The parameter error makes the calculation of the full-scale frequency of the secondary meter wrong. The reason for this is mainly related to the problems ① and ③. The same full-scale frequency makes the indication inaccurate for a long time, and the actual full-scale frequency is too much. The calculated full-scale frequency makes the indication fluctuate in a wide range and cannot be read. The inconsistency of the parameters in the data affects the final determination of the parameters, and finally passed Re-calibration combined with mutual comparison to determine the parameters and solve this problem.   4. The secondary instrument is faulty. There are many faults in this part, including: there is a disconnection on the circuit board of the instrument, the display of individual digits in the range setting is broken, and the display of individual digits in the K coefficient setting is broken, making it impossible to determine the range setting and K coefficient setting. Part of the reason is mainly related to problems ① and ②. The problem is solved by fixing the corresponding fault.   5. The four-way line connection problem. On the surface of part of the circuit, it seems that the circuit connection is very good. Check carefully. Some connectors are actually loose and the circuit is interrupted. Although some connectors are tightly connected, the fastening screws are fastened to the wire skin due to the problem of the secondary line, which also makes the circuit. Interruption, this part of the reason is mainly related to problem ②. 6. The connection problem between the secondary instrument and the follow-up instrument. The mA output loop of the secondary instrument is interrupted due to the problem of the follow-up instrument or the maintenance of the follow-up instrument. For this type of secondary instrument, this part of the reason is mainly related to the problem ②. Especially for the follow-up recorder, if the recorder is damaged for a long time and cannot be repaired, you must pay attention to short-circuit the output of the secondary instrument.  7. There is always no indication in the circuit due to the failure of the flat shaft cable of the secondary instrument. Due to the long-term operation and the influence of dust, the flat shaft cable fails. The problem can be solved by cleaning or replacing the flat shaft cable.   8. The problem ⑦ is mainly due to the loosening of the fixing screw of the secondary meter display meter coil, which causes the meter head to sink, the pointer and the case friction are large, and the action is not working properly. The problem is solved by adjusting the meter head and fixing it again.   9. Use environmental issues. Especially the part of the sensor installed in the underground well, due to the high humidity in the environment, causes the circuit board to get damp. This part of the reason is mainly related to the problems ② and ②. Through corresponding technical improvement measures, some sensors with high environmental humidity have been re-processed to separate the probe part from the conversion part and use a separate sensor. Therefore, the working environment has been improved. This part of the instrument has been running well recently.   10. Due to poor on-site adjustment, or due to further changes in the actual situation after adjustment. Due to the on-site vibration and noise balance adjustment and sensitivity adjustment is not good. Or, due to the further change of the site conditions after a period of operation after adjustment, the indication problem is caused. This part of the reason is mainly related to the problems ④ and ⑤. Use an oscilloscope and re-adjust according to the process operation.
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