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Industry Information
Vortex flowmeter process part of the equipment is not used, resulting in a decrease in the actual actual flow
2012-4-12 10:51:27

=流量仪表系列,我公司技术人员在开发关于涡街流量计时,特给出涡街流量计的运作模式,给予参考:涡街流量传感器接受二次仪表的12VDC供电,采用压电晶体元件检测旋涡分离频率. Jiangsu Jinhu Dongxiang Instrument Co., Ltd. specializes in the production of vortex flowmeters = flow meter series. When our technicians develop vortex flowmeters, they give the operation mode of the vortex flowmeters for reference: vortex flow sensors accept The 12VDC power supply of the secondary instrument uses a piezoelectric crystal element to detect the vortex separation frequency. The probe body installed inside the cylinder feels the pressure pulse generated by the vortex on both sides of the rear of the cylinder. The piezoelectric crystal element embedded in the probe body feels the effect of this strain and generates an alternating charge. The amplitude pulse signal is given to the secondary meter. This pulse signal is proportional to the flow through the pipeline. This proportional relationship is determined by the sensor's x coefficient. The x coefficient is generally calibrated by the manufacturer. The k coefficient represents the number of pulses sent by the sensor for each flow unit flowing through the pipeline. The secondary meter is a flow display meter mainly composed of SK series single-chip microcomputer 908. After receiving this pulse signal, on the one hand, the instantaneous flow rate is displayed by a pointer ammeter, on the one hand, the accumulated flow rate or accumulated time is displayed by an 8-digit digital display, and on the other hand, It can output 4 ~ 20 mA or 0 ~ 10 mA signal to the regulator or recorder. The secondary meter sets parameters based on the K factor and flow range of the sensor.

是我公司明星产品之一,在多年来,广大客户多次选购涡街流量计,并得到广大客户的一致好评。 Vortex flowmeter is one of our company's star products. Over the years, our customers have purchased vortex flowmeters for many times and received unanimous praise from our customers.

测量偏差各方面的问题说明1、选型方面的问题。 Vortex flowmeter measurement deviation in all aspects of the problem description 1, selection issues. Some vortex sensors have been selected in a large size or after design and selection due to changes in process conditions, which made the selection larger—a specification. The actual selection should choose the smallest size possible to improve measurement accuracy. The main reasons for this are the same. Questions ①, ③, ⑥ are related. For example, a vortex street pipeline is designed to be used by several equipments. Because the process equipment is sometimes not used, the current actual flow rate is reduced. The actual use causes the original design to be selected too large, which is equivalent to increasing the measurable flow rate. At the lower limit, the indication cannot be guaranteed when the flow rate of the process pipeline is small, and it can be used when the flow rate is large, because it is too difficult to rebuild (sometimes, the process conditions are only temporary). Can be combined with parameter re-tuning to improve the indication accuracy. 2. Installation problems. 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. 3. Reason for parameter setting direction. Due to the wrong parameter, the instrument indication is wrong. The parameter error causes the secondary meter full-scale frequency to be calculated incorrectly. The main reason for this is related to problems ① and ③. The full-scale frequency is similar, which makes the indication inaccurate for a long time. The full-scale frequency calculated by the actual full-scale frequency makes the indication fluctuate widely and cannot be read. The inconsistency of the parameters on the data affects the final determination of the parameters. Re-calibration combined with mutual comparison determined the parameters and solved this problem. 4. Secondary instrument failure. This part has many faults, including: once the instrument circuit board is disconnected, the range setting has individual bits displayed badly, the k coefficient setting has individual bits displayed badly, making it impossible to determine the range setting and the k coefficient setting. Part of the reason is mainly related to problems ① and ②. The problem was resolved by fixing the corresponding fault. 5, four-way line connection problems. Some circuits look good on the surface of the circuit. Carefully check that some connectors are actually loose and cause the circuit to be interrupted. Although some connectors are tightly connected, due to the problem of the auxiliary line, the fastening screws are fastened to the wire cover, which also makes the circuit. Interruption, this part of the cause is mainly related to problem ②. The corresponding line problems were solved, and the existing problems were also solved accordingly. 6. The connection between the secondary instrument and the subsequent instrument. The mA output circuit of the secondary meter is interrupted due to a problem with the subsequent meter or the maintenance of the subsequent meter. For this type of secondary meter, this part of the cause is mainly related to problem ②. Especially for subsequent recorders, if the recorder is damaged for a long time and cannot be repaired, it is necessary to pay attention to shorting the output of the secondary instrument. 7. There is no indication on the circuit due to the secondary instrument flat axis cable failure. Due to the long-term operation and the influence of dust, the flat-axis cable is faulty. The problem can be solved by cleaning or replacing the flat-axis wire. 8. For the problem, it is mainly due to the looseness of the screw on the coil of the secondary meter display meter head, which causes the meter head to sink, the pointer to the watch case to have a large friction, and the action not working. By adjusting and refixing the meter head, the problem is solved accordingly. 9, the use of environmental issues. Especially the sensor part installed in the ground well, due to the high ambient humidity, the circuit board gets wet. This part of the reason is mainly related to problems ② and ②. Through corresponding technical reform measures, some sensors with high ambient humidity have been re-separated from the probe part and the conversion part, and replaced with a separate sensor, so the working environment has been improved, and this part of the instrument has been running well. 10. Due to poor on-site adjustment, or due to changes in the actual situation after adjustment. Due to poor on-site vibration and noise balance adjustment and sensitivity adjustment. Or due to the change of the on-site situation after a period of operation after the adjustment, the indication problem is caused. This part of the cause is mainly related to problems ④ and ⑤. Use an oscilloscope, coupled with the process running conditions, readjust. 11. The reason why the problem 提出 was raised separately is that this problem has affected the analysis and solution of the problem for a long time. Because the K-factor calibration conditions are not available, the K-factor can only be based on the information provided by the manufacturer. Due to some changes in the manufacturer itself, As a result, the K coefficients in the provided materials are not consistent, which affects the solution of the problem. By looking for conditions to recalibrate, or through repeated modification and comparison, the unified instrument parameters were finally determined.