Detailed analysis of the vortex flowmeter in several aspects - Database & Sql Blog Articles

Jiangyin Baiyue Instrument Co., Ltd. Vortex flowmeter is mainly used for the flow measurement of industrial pipeline medium fluid, such as gas, liquid, steam and other media. Its characteristics are small pressure loss, large measuring range and high precision. It is not affected by parameters such as fluid density, pressure, temperature and viscosity when measuring the volumetric flow rate. No moving mechanical parts, so the reliability is high and the maintenance is small. Instrument parameters can be stable for a long time. The instrument adopts piezoelectric stress sensor, which has high reliability and can work in the working temperature range of -20 °C ~ +250 °C. There are analog standard signals and digital pulse signal output, which is easy to use with digital systems such as computers. It is an advanced and ideal flow meter. There are mainly the following problems: 1 indicates long-term inaccuracy; 2 indicates no indication; 3 indicates wide-ranging shake, unable to read; 4 indicates no return to zero; 5 indicates no indication when there is small flow; When the flow rate is small, the indication is not allowed; 7 the change of the liquid indicates that the change cannot keep up; 8 the K coefficient of the meter cannot be affirmed, and the materials are not different. Analysis and treatment of major problems These problems have been analyzed and processed for nearly half a year. Due to the confusing problems, there are different levels of problems from the juice setting device, parameter setting, daily maintenance and operating environment. Many problems are related to each other. In addition, the handling of some problems requires waiting for certain process operation opportunities, which brings great difficulties to the handling of the problems. Some problems are formed by different reasons, and some reasons are related to different problems. Summarizing the main reasons for these problems, mainly touched the following aspects: 1. Selection problems. Some vortex sensors are selected on the caliber type or after the design and selection, because the process conditions are changed, so that the selection is larger - the specification should be selected as small as possible to improve the measurement accuracy. The reason for this is mainly the same. Questions 1, 3, and 6 are related. For example, a vortex pipeline design is used for several equipments. Because the local equipment is sometimes not used, the current practice uses flow reduction, and the practical application forms the original design. The caliber is too large, which is equivalent to the improvement of the measurable flow. The lower limit, the indication of the small flow of the process pipeline can not be guaranteed, and the flow can be used when the flow is large, because it is too difficult to re-construct. Changes in process conditions are only temporary. The re-tuning of the separable parameters is done to improve the indication accuracy. 2. Problems with the device. 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 1. For example: the straight pipe section of the second-circle FIC203 sensor is obviously lacking. Since the FIC203 is not used for measurement, it is only used for control, so the current precision can be used equivalent to the downgrading operation. 3. The reason for the parameter setting direction. Due to a parameter error, the instrument indication was incorrect. The parameter error makes the secondary instrument full-scale frequency calculation error, and the reason for this is mainly related to questions 1, 3. The full-scale frequency is similar, which makes the indication of long-term inaccuracy. The full-scale frequency of the full-scale frequency and large-scale calculation makes the indication of wide-ranging shake and cannot be read, and the non-discrimination of the parameters on the material affects the final affirmation of the parameters. After re-calibration and separation, the parameters were affirmed and the problem was solved. 4, secondary instrument problems. There are many local problems, including: when the instrument board has a broken line, the range setting has individual bits appearing bad, and the K-factor setting has individual bits appearing bad, making it impossible to confirm the range setting and K-factor setting. The local cause is mainly related to questions 1, 2. After repairing the corresponding problems, the problem was dealt with. 5. The connection problem of four roads. On the external circuit, the line is well connected and carefully checked. Some joints have been loosely formed to form loop suffixes. Some joints are tightly connected, but the fastening screws are fastened to the wire due to the secondary line problem. The loop infix, this local cause is mainly related to question 2. The corresponding line problem is dealt with and the existing problems are handled accordingly. 6. The connection problem between the secondary instrument and the subsequent instrument. Due to the problem of the subsequent instrument or the maintenance of the subsequent instrument, the mA output circuit of the secondary instrument is suffixed. For this type of secondary instrument, this local reason is mainly related to the problem 2. In particular, regarding the subsequent recorder, in the case where the long-term damage of the recorder cannot be repaired, it is necessary to pay attention to the output of the secondary meter. 7. There is no indication because the secondary instrument flat-axis cable is faulty. Due to long-term operation, coupled with the impact of dust, the formation of flat-axle cable problems, after cleaning or changing the flat-axis wire, the problem can be dealt with. 8. About the problem 7 is mainly due to the secondary instrument showing that the fixed coil of the head coil is loose, forming the head sinking, the pointer and the case friction are large, the movement is not working, after adjusting the meter head and re-fixing, the problem is dealt with accordingly. 9. Use environmental issues. In particular, the local part of the sensor in the well is affected by the humidity of the environment, and the circuit board is damp. This local cause is mainly related to problems 2 and 2. After the corresponding technical reform measures, the sensitivity of the local environment with high humidity is newly added. The probe part and the conversion part are separately treated, and the separate type sensor is used. Therefore, the working environment is good, and the local instrument has been running well. 10, due to poor on-site adjustment, or due to changes in the practice after the adjustment. Due to the on-site vibration and noise balance adjustment and flexibility adjustment is not good. Or, due to the re-allocation of the on-site condition after a period of operation after the adjustment, an indication problem is formed, which is mainly related to the problems 4 and 5. Use the oscilloscope, plus the separation process to re-adjust. 11. The reason why question 8 is raised separately is that this problem has affected the analysis of the problem for a long time. Since many factories do not have the K-factor calibration conditions, the K-factor can only be based on the materials provided by the manufacturer, due to some of the manufacturers themselves. The change, the formation of several materials on the K coefficient is not - caused, affecting the problem processing. After re-calibration of the search conditions, or repeated corrections, the unified instrument parameters are finally confirmed. After a period of careful analysis and summary of the technical personnel of Jiangyin Baiyue Instrument Co., Ltd., the problems existing in the vortex flowmeter have been fundamentally dealt with. At present, the local instrument works well and fundamentally meets the needs of the factory process consumption. Vortex flowmeter is the main product of Jiangyin Baiyue Instrument Co., Ltd., the Wanli Yangtze River gives you a broad mind, and Tianzhu passes through the wings of your take-off. 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