The main problems in the measurement deviation of vortex flowmeters:
1: Problems with 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 increasing the measurable flow rate. The lower limit indicates that the flow rate can not be guaranteed when the flow rate in the process pipeline is small, and it can be used when the flow rate is large, because it is too difficult to re-engineer (sometimes, the change of process conditions is only temporary). The re-tuning of the parameters can be combined to improve the indication accuracy.
2: Installation issues. 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 reasons for this are mainly related to Problem 1.
3: The reason of 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 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 sheath due to 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: Connection problem 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 secondary instrument display head coil fixed screw loose, causing the head sink, the pointer and case friction, action is not working, by adjusting the meter head and re-fixed, the problem is resolved accordingly.
9: Use of environmental issues. Especially in the sensor part installed in the well, due to the high humidity in the environment, the board is damped. This is partly due to problem 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 running well a few days ago.
10: Due to poor on-site adjustment, or due to changes in the actual situation after adjustment. Due to live vibration and noise balance adjustment and sensitivity adjustment is not good. Or, due to the re-alteration of the situation after the adjustment for 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.
Mini Warehouse Solutions,Small Warehouse,Security Mini Storage,Self Storage Solutions
FCX Metal Structure Co., Ltd. , https://www.fcxmetal.com