Vortex flowmeter is mainly used for the flow measurement of medium fluids in industrial pipelines, such as gases, liquids, vapors and other media. By using a triangular column vortex generator in the fluid, a regular vortex is alternately generated from both sides of the vortex generator. This vortex is called a Karman vortex. As shown in the right figure, the vortex array is asymmetrically downstream from the vortex generator. arrangement.
The common problems of vortex flowmeters are: 1. Indication of long-term inaccuracy; 2. No indication at all; 3. Indications of wide-range fluctuations, inability to read; 4. Indication of non-return to zero; 5. No indication at small flow rates; The indication of flow rate is also available. When the flow rate is small, the indication is inaccurate. 7. When the flow rate changes, the indication change cannot be followed. 8. The K factor of the instrument cannot be determined, and the data are inconsistent in many places.
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 the selection of a large D specifications, 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 increasing 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, which affects 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 settings have a bit of individual display is bad, K-factor is set to display a bad individual bits, making it impossible to determine the range setting and K-factor setting, which 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 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 sheath due to the problem of the secondary wires. Interruption, 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 subsequent instruments or due to subsequent instrument overhaul, the mA output circuit of the secondary instrument is interrupted. For this type of secondary instrument, this part is mainly related to 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 the second meter display head coil fixed screws loose, causing the head sink, the pointer and the case of friction, action does not work, by adjusting the meter head and re-fixed, the corresponding solution.
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 technical reform measures, the part of the sensor with a large environmental 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 working well the other day.
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-alteration of the on-site situation after a period of time after the adjustment, the 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.
Fat Ebike,Electric Fat Bicycle,Foldable Electric Bikes,Fat Electric Bike Bikes
ZHEJIANG XINGYUE OVERFLY ELECTRIC VEHICLE CO., LTD , https://www.overflyebike.com