| electromagnetic flowmeter is the 1960s with the development of electronic technology and rapidly develop a new type of flow measuring instruments. it according to Faraday's law of electromagnetic induction made of conductive fluid used to measure the volume of traffic. Because of its unique advantages, has been widely used in various industries conductive liquid measurement, for example, measuring all kinds of acid and alkali, salt and other corrosive liquids; various flammable, explosive medium; various industrial effluent, Pulp, mud, and so on.
electromagnetic flowmeter is the main characteristics:
electromagnetic flowmeter transmitter simple structure, no moving parts, and there is no fluid flow impeded the expenditure components, so when the passage of fluid does not cause any additional pressure loss, but it will not cause such as Wear to plug the problem is particularly applicable to measuring the pulp with a solid particles, such as sewage flow of liquid to solid, as well as more viscous slurry, and so on. Similarly, because of its structure without moving parts, it can be attached Corrosion-resistant lining, insulation materials and choices decay resistance electrodes, a very good corrosion resistance, so that it can be used for all kinds of corrosive media measurement.
electromagnetic flowmeter is - the volume of flow measurement instruments, in the measurement process, it does not measured medium temperature. viscosity, density and electrical conductivity (in a certain range) affected. Therefore, the electromagnetic flowmeter Just after the demarcation of the water, on the other can be used to measure the conductivity of liquid flow, without the need to attach other amendments.
electromagnetic flowmeter range of very wide, the same electromagnetic flowmeter range up to 1:1 ratio. In addition, the electromagnetic flowmeter measured only with the media is directly proportional to the average velocity, and the distribution of axial symmetry Flow (laminar or turbulent) has nothing to do.
electromagnetic flowmeter without mechanical inertia, responsive, and can measure the pulse of the instantaneous flow, and linear good, so can be measured directly buy signal converter used to convert standard linear signal output, on the instructions, Can also be long-distance transmission.
Although electromagnetic flowmeter with the fine features, but it has some deficiencies, resulting in the use subject to certain restrictions. main points are as follows:
can not be used to measure electromagnetic flowmeter gas, steam and contains a lot of liquid gas.
electromagnetic flowmeter is still not used to measure the conductivity of the liquid medium low, measured the electrical conductivity of liquid medium can not be less than 10 -5 (S / cm), equivalent to the conductivity of distilled water. on petroleum products Or organic solvents, and so also powerless.
due to the measurement of temperature insulation lining material constraints, the current industry still can not measure electromagnetic flowmeter high temperature and high pressure fluids.
electromagnetic flowmeter affected by the velocity distribution in the axial symmetry of the conditions, traffic signals and is directly proportional to the average velocity. Therefore, before and after the electromagnetic flowmeter must also have a certain length of the straight before and after the paragraph.
electromagnetic flowmeter vulnerable to the impact of external electromagnetic interference. |
