The advantages and disadvantages of flowmeters are all known

There are more than 60 kinds of old-fashioned flow meters, and each product has its specific applicability and limitations. According to the measurement object, there are two types: closed pipe and open channel; according to the measurement purpose, it can be divided into total measurement and flow measurement, and the instruments are called total meter and flow meter respectively. In addition, according to the measurement principle, it can be divided into the following categories: Mechanics principle: The instruments belonging to this kind of principle include differential pressure type and rotor type using Bernoulli's theorem; impulse type and movable tube type using momentum theorem; The direct mass formula of Newton's second law; the target formula using the fluid momentum principle; the turbine formula using the angular momentum theorem; the vortex formula and vortex street formula using the fluid oscillation principle; Weir, trough, etc. Electrical principle: Instruments used for this type of principle include electromagnetic, differential capacitance, inductance, strain resistance, etc. Acoustic principle: There are ultrasonic type, acoustic type (shock wave type) and so on. Thermal principle: There are calorimetric, direct calorimetric, and indirect calorimetric methods for measuring flow using thermal principles. Optical principle: type, photoelectric type, etc. are instruments belonging to this type of principle. Principles of atomic physics: nuclear magnetic resonance, nuclear radiation, etc. are instruments that belong to this type of principle. Other principles: there are marking principles (tracer principle, nuclear magnetic resonance principle), related principles, etc. According to the current popular and extensive classification method, this article respectively expounds the principles, characteristics, application overview and domestic and foreign performance of various flowmeters: 1. Electromagnetic flowmeter 1. Advantages (1) Electromagnetic flowmeter can be used to measure industrial Conductive liquids or slurries. (2) No pressure loss. (3) The measurement range is large, and the diameter of the electromagnetic flow transmitter is from 2.5mm to 2.6m. (4) The electromagnetic flowmeter measures the volume flow rate of the measured fluid under working conditions, and the measurement principle does not involve the influence of the temperature, pressure, density and viscosity of the fluid. 2. Disadvantages (1) The application of electromagnetic flowmeter has certain limitations. It can only measure the liquid flow of conductive media, but cannot measure the flow of non-conductive media, such as heating water with better gas and water treatment. In addition, the lining needs to be considered under high temperature conditions. (2) The electromagnetic flowmeter determines the volume flow rate under the working condition by measuring the velocity of the conductive liquid. According to the measurement requirements, for liquid media, the mass flow rate should be measured, and the measurement of the medium flow rate should involve the density of the fluid. Different fluid media have different densities and vary with temperature. If the electromagnetic flowmeter converter does not consider the fluid density, it is not appropriate to only give the volume flow at normal temperature. (3) The installation and debugging of electromagnetic flowmeters are more complicated than other flowmeters, and the requirements are stricter. The transmitter and converter must be used together, and two different types of instruments cannot be used between the two. When installing the transmitter, from the selection of the installation site to the specific installation and commissioning, it must be carried out in strict accordance with the requirements of the product manual. There should be no vibration or strong magnetic field at the installation site. During installation, the transmitter and the pipeline must have good contact and good grounding. The potential of the transmitter is at the same potential as the measured fluid. When in use, the gas remaining in the measuring tube must be exhausted, otherwise a large measurement error will be caused. (4) When the electromagnetic flowmeter is used to measure viscous liquid with dirt, the viscous or sediment adheres to the inner wall of the measuring tube or the electrode, causing the output potential of the transmitter to change, resulting in measurement error, and the dirt on the electrode reaches a certain level. thickness, may cause the meter to fail to measure. the

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