Although the plug-in electromagnetic flowmeter is simple to operate and requires less maintenance, long-term use will still cause the electrodes to become dirty or worn.
Although the plug-in electromagnetic flowmeter is simple to operate and requires less maintenance, long-term use will still cause the electrodes to become dirty or worn. Therefore, to ensure accurate measurement, it is very necessary to conduct regular maintenance of the insertion electromagnetic flowmeter. For plug-in electromagnetic flowmeters, the system must be shut down for each maintenance and the liquid in the pipeline must be drained before disassembly. If a malfunction occurs during abnormal maintenance, the disassembly and assembly of the plug-in electromagnetic flowmeter will have a great impact on continuous production efficiency. Therefore, an isolation ball valve can be installed on the mounting base to realize online plugging and unplugging when the system is running continuously to ensure the continuous and stable operation of the system. The insertion flow meter is not a type of flow meter that was invented in recent years. Its measurement principle and measurement method using the velocity area method and its use have a long history. Compared with other flow meters, it has extremely obvious characteristics.
1. Advantages of insertion flow meters
(1) Simple structure, light weight and low manufacturing cost. Especially for large-diameter pipelines, this melting point is more prominent compared with other flow meters.
(2) It is easy to install and can be made into a continuous flow-out structure, which is convenient for users to repair and replace. For harsh on-site working conditions (such as corrosion, dirt, high temperature and high pressure, etc.), the reliability of the instrument will be greatly increased.
(3) The pressure loss of the instrument is very small.
(4) It is applicable to a wide range of fluid types, working conditions and pipe diameters.
(5) Large-diameter point flow type insertion flowmeter is easy to calibrate, and there is no need to have a one-to-one correspondence between the caliber of the calibration device and the caliber of the flowmeter, thus greatly improving the technical and economical efficiency of instrument calibration. It solves the problems of large-diameter flowmeter manufacturing and calibration during use.
(6) One specification of point-flow flow sensor can be used for a variety of pipe diameters, which can greatly reduce the number of users' spare instruments and spare parts, and brings many problems to design, manufacturing and on-site use. convenient.
(7) Can be made into a portable flow meter.
2. Disadvantages of the insertion electromagnetic flowmeter
(1) The instrument characteristics are greatly affected by the fluid flow characteristics, especially the point-flow type insertion flowmeter, which has a negative impact on the on-site straight pipe section. Length requirements are high.
(2) The measurement accuracy of the instrument is generally low, and it is only suitable for flow measurement and control in modern industrial process detection and control systems, but not suitable for trade accounting, total measurement and product handover of expensive fluids. , especially the point flow type insertion flow meter calibrated by the flow meter method.
(3) It is difficult to standardize instruments.
As for the insertion flow meter, since no in-depth experimental research has been conducted on it at home and abroad in the past, most of them regard it as an auxiliary flow meter and can only It is used in unimportant or low-accuracy situations and is just a supplement to commonly used flow meters. It should be pointed out that at present, there is still a long way to go before insertion flowmeters can reach the accuracy level of common flowmeters. However, due toIn recent years, the urgent need for large-diameter flow measurement has placed insertion flowmeters in an increasingly important position. Especially in energy and environmental measurement, there are often large diameters, large flows and harsh working conditions. Usually flow meters and pipelines are flange-connected. Disassembly, repair and replacement are only allowed when the process pipeline is cut off, making the system more reliable. Operation has a great impact, and the insertion flow meter fundamentally solves this defect, so it is very popular among users. Although the measurement accuracy is slightly lower, insertion flow meters have been used to measure the total amount of fluid in some large-diameter situations.
Hangzhou Economic Development Area，Hangzhou 310018，China
