What are the advantages and disadvantages of electromagnetic flowmeter

2024-07-17

Electromagnetic flowmeter transmitter structure is simple, there is no movable parts, there is no obstacle to the flow of fluid throttling parts, so when the fluid passes through will not cause any additional pressure loss, at the same time it will not cause problems such as wear and tear, clogging, etc., is particularly suitable for the measurement of solid particles with solid slurries, sewage and other liquids and solid-phase fluids, as well as a variety of viscous slurries and so on.

Electromagnetic flowmeter advantages:

(1) Higher accuracy, can reach 0.2 ~ 0.5 grade.
(2) No pressure loss, no obstruction to the flow of parts in the measuring tube, straight pipe section requirements are low.
(3) large measurement range, electromagnetic flow meter calibre range from a few mm to 3m.
(4) Electromagnetic flowmeter to measure the measured fluid volume flow under the working condition, the measurement principle does not involve the influence of fluid temperature, pressure, density and viscosity.
(5) The converter adopts 16-bit high-performance microprocessor, 2 × 16 LCD display, convenient parameter setting, reliable programming.
(6) The converter can be formed with the sensor in one body or separate type.
(7) Durable, long service life, general service life of 10 to 20 years or more.

Electromagnetic flowmeter disadvantages:

(1) Electromagnetic flowmeter applications have certain limitations, it can only measure the liquid flow of conductive media, can not measure the fluid of non-conductive media, for example, gas and water treatment better heating water. In high temperature conditions need to choose a suitable lining.
(2) measurement of the pipeline must be completely filled with liquid, not full of pipe in the case of easy to cause the flowmeter jump.
(3) electromagnetic flowmeter installation and commissioning than other flowmeter complex, and more stringent requirements. Transmitter and converter must be used in conjunction with the two can not be used between two different types of instrumentation with. In the installation of the transmitter, from the selection of the installation site to the specific installation and commissioning, must be in strict accordance with the requirements of the product specification. The installation site can not have vibration, can not have a strong magnetic field. During installation, the transmitter must have good contact with the pipeline and good grounding. The potential of the transmitter is equipotential to the measured fluid. In use, must exhaust the gas stored in the measuring tube, otherwise it will cause a large measurement error.
(4) electromagnetic flowmeter used to measure viscous liquid with dirt, viscous material or sediment attached to the inner wall of the measuring tube or electrode, so that the transmitter output potential changes, bringing measurement error, electrode dirt to a certain thickness, may lead to the instrument can not be measured.
(5) water supply pipe scaling or wear and tear to change the size of the inner diameter, will affect the original flow value, resulting in measurement error. Such as 100mm calibre instrument diameter change 1mm will bring about 2% additional error.
(6) electromagnetic flowmeter price is higher than the price of ultrasonic flowmeter. Electromagnetic flowmeter price and pipe diameter is proportional to the increase in pipe diameter with the price is relatively high.