Thread Content
This post was last edited by yuchenchf on 2017-3-31 07:50. Today, we will talk about the installation of electromagnetic flowmeters. Since the quality of installation directly affects subsequent operations and work efficiency, attention must be paid to the installation process. From what I know, electromagnetic flowmeters have high stability and rarely experience failures. However, it should be noted that changes in environmental conditions as well as limitations related to the installation conditions can lead to various problems. We need to learn how to prevent these issues, which mainly manifest in the following situations that we should avoid. (1) Electromagnetic flowmeters have certain requirements regarding the pipes they are used in; high standards are applied to the straight sections of these pipes. These requirements can be met as much as possible during the design of new water treatment plants. However, when upgrading or installing such devices in existing water treatment plants, it becomes more difficult to meet these conditions, which can affect the stability of the equipment. A solution to this issue is to install straightening tubes to improve the flow characteristics. (2) Secondly, an excessively low flow rate of the water being measured can also affect the accuracy of the measurements. This is especially true for flow meters installed at the boundaries of urban areas, where they are located at the end of the local utility networks and thus experience low pressure differences, resulting in low flow rates. To address this issue, the valves on both sides of the boundary can be opened as much as possible to improve the situation. (3) Thirdly, the presence of gas in the pipeline can cause fluctuations and instability in measurements. To address this issue, it is necessary to identify the source of the gas and take action to eliminate it; if needed, an exhaust valve can be installed in the pipeline. (4) The sensor electrodes of the flow meter installed in the raw water pipeline are contaminated by sediment deposition, which affects the measurements. The solution is to use a scraper-type electrode and to perform regular maintenance and cleaning of the well. (5) Accumulation of foreign objects in the inlet pipe of the electromagnetic flowmeter. This results in a sudden change in the flow properties of the water body under test, thereby affecting the measurement accuracy and causing significant errors. The solution is to promptly remove the debris accumulated in the pipes. (6) Lightning strikes damage the converter of the electromagnetic flowmeter, rendering it unable to measure. The solution is to install corresponding lightning arresters at the converter signal input, the excitation current input, and the power supply terminal respectively. The above are the experience insights shared by the editor based on years of work experience. If you have any additional comments or questions, feel free to leave a message for discussion.