Vortex flowmeter is widely used due to its small pressure loss, large range, high accuracy, and almost no influence of fluid pressure, density, temperature, viscosity, and other parameters when measuring volume flow. At present, it is a relatively advanced and ideal measuring instrument. But in the long-term application will inevitably encounter problems, the following mainly introduces the vortex flowmeter in the application of possible problems and their treatment.
The main problems with vortex flowmeters are:
The main problems with vortex flowmeters are:
1 indicates long-term inaccuracy;
2 No indication at all times;
3 indicates a wide range of fluctuations, unable to read;
4 indicates no return to zero;
5 No indication when the flow rate is small;
The indication can also be 6 when the flow is large, and the indication is inaccurate when the flow is small.
7 Change in flow rate indicates that the change cannot keep up;
8 The K factor of the instrument cannot be determined, and the data are inconsistent in many places.
The main reasons for these problems caused by the application of vortex flowmeters mainly relate to the following aspects:
1, the problem of selection.
Some vortex flowmeters, open channel flowmeter sensors in the choice of caliber or after the design selection due to changes in process conditions, making a choice - a specification, the actual selection should choose the smallest possible diameter, in order to improve the measurement accuracy The reasons for this are mainly related to questions 1, 3 and 6. For example, a vortex flowmeter pipeline is designed to be used by several devices. Because some equipment of the process is sometimes not used, the actual actual use flow rate is reduced, and the actual use causes the original design selection aperture to be too large, which is equivalent to improving the measurability. The lower limit of the flow, the process pipeline can not guarantee when the small flow, the flow can also be used, because if you want to re-transformation sometimes too difficult. Changes in process conditions are only temporary. The re-tuning of the parameters can be combined to improve the indication accuracy.
2, the installation of the problem.
The main reason is that the length of the straight pipe section in front of the vortex flowmeter sensor is not 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 the FIC203 is not used for metering, it is only used for control. Therefore, the current accuracy can be equivalent to degraded use.
3, the reason for the parameter setting direction.
Due to an incorrect parameter, the instrument indicates an error. The erroneous parameters of the vortex flowmeter make the secondary instrument full-scale frequency calculation error. The reasons for this are mainly related to problems 1 and 3. The fact that the full-scale frequency is similar makes the indicator inaccurate for a long time. The full-scale frequency of the actual full-scale frequency large-scale calculation indicates that the full-scale frequency fluctuates and cannot be read. However, the inconsistency of the parameters on the data affects the final determination of the parameters. The recalibration combined with each other determines the parameters and solves this problem.
4, secondary instrument failure.
This part of the fault more, including: a meter circuit board where there is a broken line, the range setting has a bit of individual display is bad, K-factor is set to display a bad individual bits, making the meter can not determine the range setting and K-factor setting This part of the reason is mainly related to questions 1 and 2. By fixing the corresponding fault, the problem is solved.
5, four-way line connection problem.
The circuit is well connected on the surface of some loops. Carefully check that some of the connectors have actually been loosened and the loop is interrupted. Although some connectors are tightly connected, the fastening screws are fastened to the wire due to the problem of the secondary wires. The loop of the meter is interrupted. This part of the reason is mainly related to question 2.
6, the connection between the secondary instrument and the subsequent instrument.
Due to problems with the subsequent instrument or due to the overhaul of the subsequent instrument, the mA output circuit of the secondary instrument of the vortex flowmeter is interrupted. For this type of secondary instrument, this part is mainly related to the problem 2. Especially for the follow-up recorder, in the case of long-term damage to the recorder can not be repaired, we must pay attention to the output of the secondary short-circuit meter.
7. The loop has no indication due to the failure of the secondary meter flat cable.
Due to the long-term operation, coupled with the impact of dust, resulting in flat cable failure, by cleaning or replacing the flat cable, the problem can be solved.
8, for the problem 7 is mainly due to vortex flowmeter secondary instrument display head coil fixed screws loose, causing the head sink, the pointer and the case of friction, action is not working, by adjusting the header and re-fixed, the corresponding problem solve.
9, the use of environmental issues.
Especially in the sensor part installed in the well, due to the high humidity in the environment, the board is damp, which is partly related to problems 2 and 2. Through corresponding technological reform measures, the part of the sensor with a large ambient humidity was re-disposed of the probe part and the conversion part, and a separate sensor was used. Therefore, the working environment of the vortex flowmeter was good, and this part of the instrument was working well a few days ago. .
10, due to on-site adjustment is not good, or due to the actual situation after the adjustment and then change.
Due to live vibration and noise balance adjustment and sensitivity adjustment is not good. Or, due to the re-changing of the situation after the adjustment for a period of time after the adjustment, the vortex flowmeter indication problem is caused. This part of the reason is mainly related to questions 4 and 5. Use the oscilloscope, combined with the operation of the process, readjust. Huajiang Automation treats every customer with a professional attitude. If you have any questions, we will have professional technical personnel to help you answer and hope to help you!
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