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Electromagnetic flowmeter is an instrument that measures the volume
flow of conductive liquids based on Faraday's law of
electromagnetic induction. Its main structure includes measuring
tube, electrode, excitation system, signal converter, etc. There
are no parts that hinder the flow of fluid in the measuring tube,
and there is almost no pressure loss; a pair of electrodes are
installed on the inner wall of the measuring tube, in contact with
the fluid, for detecting the induced potential; the excitation
system generates a uniform magnetic field; the signal converter
amplifies, converts and processes the weak electrical signals
detected by the electrodes, and finally outputs a standard signal
proportional to the flow rate.
When the conductive liquid flows in the measuring tube, it is
equivalent to a conductor cutting the magnetic lines of force.
According to Faraday's law of electromagnetic induction, an induced
electromotive force will be generated in the direction
perpendicular to the flow direction, and the magnitude of the
electromotive force is proportional to the flow rate of the fluid,
the magnetic field strength and the inner diameter of the measuring
tube. By measuring the magnitude of the induced electromotive
force, the flow rate of the fluid can be obtained through
calculation.
Product features of electromagnetic flowmeters
1. Can measure a variety of conductive liquids: Suitable for
measuring various liquids with conductivity greater than 5μS/cm,
such as industrial sewage, acid, alkali, salt solution, and liquid
products in the food and pharmaceutical industries. It has a wide
range of applications, covering chemical, environmental protection,
metallurgy, food and beverage and other industries.
2. Bidirectional measurement function: It can not only measure the
flow rate of the fluid in the forward direction, but also measure
the flow rate of the reverse flow. By setting, it can achieve
bidirectional flow measurement and monitoring, which provides more
possibilities for flow measurement in complex pipeline systems.
3. Easy installation and maintenance: The requirements for straight
pipe sections are relatively low. Generally, only 5-10 times the
pipe diameter is required upstream, and 2-5 times the pipe diameter
is required downstream. The sensor has a simple structure, no
moving parts, is not easy to damage, and reduces the maintenance
workload; the signal converter adopts an intelligent design, with a
friendly operation interface, which is convenient for parameter
setting and fault diagnosis.