Vortex flowmeter is mainly used for the flow measurement of medium fluids in industrial pipelines, such as gases, liquids, vapors and other media. It is characterized by low pressure loss, large measuring range, high accuracy, and almost no influence of parameters such as fluid density, pressure, temperature, and viscosity when measuring volume flow. No moving mechanical parts, so high reliability and low maintenance. Instrument parameters can be stable over a long period of time. Vortex Flowmeter This instrument adopts piezoelectric stress sensor and has high reliability. It can work in the operating temperature range of -20°C～+250°C. There are analog standard signal and digital pulse signal output. It is easy to use with digital systems such as computers. It is an advanced and ideal flow meter.
The main problems are: 1 indication of long-term inaccuracy; 2 no indication at all; 3 indication of wide-range fluctuations, inability to read; 4 indication of non-return to zero; 5 no indication of small flow; 8 indication of large flow, low flow When the indication is inaccurate; 7 indicates that the change in flow rate can not keep up; 8 K factor of the instrument can not be determined, and the data are inconsistent in many places.
Analysis and Solution of Major Problems
The main reasons for these problems are summarized as follows:
1, the problem of selection. Some vortex sensors in the caliber selection or after the selection of the design due to changes in process conditions, making a large selection - a specification, the actual selection should choose the smallest possible diameter, in order to improve the measurement accuracy, mainly in this regard Questions 1, 3, and 6 are relevant. For example, a vortex street line is designed for use on several equipment. Because some of the equipment in the process is not used sometimes, the current actual use flow rate is reduced, and the actual use causes the original design selection aperture to be too large, which is equivalent to increase the measurable flow rate. The lower limit indicates that the flow rate can not be guaranteed when the flow rate is small in the process piping, and can also be used when the flow rate is large, because it is sometimes too difficult to remodel. 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 sensor is not enough, affecting 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 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 a wrong parameter, the instrument indicates an error. The parameter error causes the secondary instrument full-scale frequency to be calculated incorrectly. The reasons for this are mainly related to problems 1 and 3. Full-scale frequency is similar to the indicator that the long-term inaccurate, the full-scale frequency of the actual full-scale calculation of the full-scale frequency indicates that a wide range of fluctuations, can not read, and the inconsistency of the parameters on the data has affected the final determination of the parameters, and finally passed The recalibration combined with each other determines the parameters and solves this problem.
4, secondary instrument failure. This part of the more failures, including: an instrument board circuit is broken, the range setting has a bit of individual display is bad, K coefficient is set to display a bad individual bits, making it impossible to determine the range settings and K-factor settings, which Some of the reasons are 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 circuits. Carefully check that some of the connectors have actually been loosened and the circuit is interrupted. Although some connectors are tightly connected, the fastening screws are fastened to the wire because of the problem of the secondary wires. Interruption, this part of the reason is mainly related to question 2. Solved the corresponding line problem, the existing problems are also resolved.
6. 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.
7, for the problem 7 is mainly due to the secondary instrument display head coil fixed screws loose, causing the head sink, the pointer and the case of friction, action does not work, by adjusting the header and re-fixed, the problem is resolved.
8, 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 technical reform measures, the part of the sensor with a large environment and humidity was re-disposed of the probe part and the conversion part, and a separate sensor was used. Therefore, the working environment was good, and this part of the instrument was running well a few days ago.
9. The reason why question 8 is proposed separately is because of the long-term problem analysis and solution to this problem. Because the eastern chemical plant does not have the K factor calibration condition, the K factor can only be based on the information provided by the manufacturer, due to the manufacturer's own Some changes have caused the K-factors on the several data provided to be inconsistent, which has affected the solution of the problem. By re-calibrating conditions, or by repeatedly modifying and contrasting, the unified instrument parameters are finally determined.
The main problems are: 1 indication of long-term inaccuracy; 2 no indication at all; 3 indication of wide-range fluctuations, inability to read; 4 indication of non-return to zero; 5 no indication of small flow; 8 indication of large flow, low flow When the indication is inaccurate; 7 indicates that the change in flow rate can not keep up; 8 K factor of the instrument can not be determined, and the data are inconsistent in many places.
Analysis and Solution of Major Problems
The main reasons for these problems are summarized as follows:
1, the problem of selection. Some vortex sensors in the caliber selection or after the selection of the design due to changes in process conditions, making a large selection - a specification, the actual selection should choose the smallest possible diameter, in order to improve the measurement accuracy, mainly in this regard Questions 1, 3, and 6 are relevant. For example, a vortex street line is designed for use on several equipment. Because some of the equipment in the process is not used sometimes, the current actual use flow rate is reduced, and the actual use causes the original design selection aperture to be too large, which is equivalent to increase the measurable flow rate. The lower limit indicates that the flow rate can not be guaranteed when the flow rate is small in the process piping, and can also be used when the flow rate is large, because it is sometimes too difficult to remodel. 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 sensor is not enough, affecting 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 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 a wrong parameter, the instrument indicates an error. The parameter error causes the secondary instrument full-scale frequency to be calculated incorrectly. The reasons for this are mainly related to problems 1 and 3. Full-scale frequency is similar to the indicator that the long-term inaccurate, the full-scale frequency of the actual full-scale calculation of the full-scale frequency indicates that a wide range of fluctuations, can not read, and the inconsistency of the parameters on the data has affected the final determination of the parameters, and finally passed The recalibration combined with each other determines the parameters and solves this problem.
4, secondary instrument failure. This part of the more failures, including: an instrument board circuit is broken, the range setting has a bit of individual display is bad, K coefficient is set to display a bad individual bits, making it impossible to determine the range settings and K-factor settings, which Some of the reasons are 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 circuits. Carefully check that some of the connectors have actually been loosened and the circuit is interrupted. Although some connectors are tightly connected, the fastening screws are fastened to the wire because of the problem of the secondary wires. Interruption, this part of the reason is mainly related to question 2. Solved the corresponding line problem, the existing problems are also resolved.
6. 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.
7, for the problem 7 is mainly due to the secondary instrument display head coil fixed screws loose, causing the head sink, the pointer and the case of friction, action does not work, by adjusting the header and re-fixed, the problem is resolved.
8, 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 technical reform measures, the part of the sensor with a large environment and humidity was re-disposed of the probe part and the conversion part, and a separate sensor was used. Therefore, the working environment was good, and this part of the instrument was running well a few days ago.
9. The reason why question 8 is proposed separately is because of the long-term problem analysis and solution to this problem. Because the eastern chemical plant does not have the K factor calibration condition, the K factor can only be based on the information provided by the manufacturer, due to the manufacturer's own Some changes have caused the K-factors on the several data provided to be inconsistent, which has affected the solution of the problem. By re-calibrating conditions, or by repeatedly modifying and contrasting, the unified instrument parameters are finally determined.