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Do you know vortex flowmeters?
The main problems of vortex flowmeter are:
â‘ The instruction is not allowed for a long time;
â‘¡No instructions at all times;
â‘¢ Indicating a wide range of fluctuations, unable to read;
â‘£ The instruction does not return to zero;
⑤No indication at low flow rate;
â‘¥ The indication is ok when the flow is large, and the indication is not allowed when the flow is small;
⑦Indication change cannot keep up when the flow rate changes;
⑧ The K factor of the instrument cannot be determined, and the data in multiple places are inconsistent.
Analysis and solutions to the problems of vortex flowmeters: Summarize the main causes of these problems, mainly related to the following aspects:
1. Problems in selection. Some vortex sensors have larger selections in the caliber selection or after design selection due to changes in process conditions. The actual selection should select the smallest possible caliber to improve measurement accuracy. The reasons for this are mainly the same Questions â‘ , â‘¢, â‘¥ are related. For example, a vortex pipeline is designed to be used by several devices. Due to the sometimes unused parts of the process, the current actual flow rate is reduced. The actual use causes the original design to be too large, which is equivalent to increasing the measurable flow rate. The lower limit, the indication cannot be guaranteed when the flow rate of the process pipeline is small, and it can be used when the flow rate is large, because it is sometimes difficult to re-modify. The change in process conditions is only temporary. It can be combined with the re-setting of parameters to improve the indication accuracy.
2. Problems with installation. The main reason is that the length of the straight pipe in front of the sensor is not enough, which affects the measurement accuracy. The reason for this is mainly related to the problem â‘ . For example: the straight pipe section in front of the sensor is obviously insufficient. 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. The reason for the parameter setting direction. Due to the wrong parameter, the indicator of the instrument is wrong. The wrong parameter makes the calculation of the full-scale frequency of the secondary instrument wrong. The reason in this respect is mainly related to the problems â‘ and â‘¢. The similar full-scale frequency makes the indication inaccurate for a long time. The actual full-scale frequency greatly calculates the full-scale frequency so that the indication fluctuates widely and cannot be read, and the inconsistency of the parameters on the data affects the final determination of the parameter. Recalibration and comparison with each other determine the parameters to solve this problem.
4. Secondary instrument failure. There are many faults in this part, including: once the circuit board of the instrument is disconnected, the individual bit display of the range setting is broken, and the individual K bit setting is broken, making it impossible to determine the range setting and the K factor setting. Part of the reason is mainly related to questions â‘ and â‘¡. By repairing the corresponding fault, the problem can be solved.
5. Four-way line connection problem. On the surface of part of the circuit, the line connection is very good. Careful inspection. Some of the connectors have actually been loosened, causing the circuit to be interrupted. Although some of the connectors are tightly connected, the fastening screw is tightened on the wire due to the problem of the auxiliary line, which also makes the circuit Interruption, this part of the reason is mainly related to problem â‘¡.
6. The connection between the secondary instrument and the follow-up instrument. Due to the problem of the follow-up instrument or the maintenance of the follow-up instrument, the mA output circuit of the secondary instrument is interrupted. For this type of secondary instrument, this part of the reason is mainly related to the problem â‘¡. Especially for the follow-up recorder, when the recorder is damaged for a long time and cannot be repaired, it is necessary to pay attention to short-circuit the output of the secondary instrument.
7. Due to the failure of the flat shaft cable of the secondary instrument, the loop has no indication at all times. Due to the long-term operation, coupled with the influence of dust, the flat-axis cable malfunctions, and the problem can be solved by cleaning or replacing the flat-axis wire.
8. For the problem ⑦, it is mainly due to the loosening of the fixing screws of the coil of the display head of the secondary meter, which causes the head to sink, the pointer and the case friction is large, and the action is not effective. By adjusting the head and re-fixing, the problem is solved accordingly.
9. Environmental issues. Especially for the sensor part installed in the ground well, due to the high humidity of the environment, the circuit board is damp. This part of the reason is mainly related to the problem â‘¡, â‘¡. Through corresponding technical reform measures, some sensors with high ambient humidity were re-separated from the probe part and the conversion part, and a separate sensor was used. Therefore, the working environment was improved, and this part of the instrument has been operating well.
10. Because the on-site adjustment is not good, or because of the actual changes after adjustment. Due to the poor adjustment of vibration and noise balance and sensitivity adjustment on site. Or due to the changes in the site after a period of operation after adjustment, the indication problem is caused. This part of the reason is mainly related to problems ④ and ⑤. Use an oscilloscope, combined with the operating conditions of the process, readjust.