How is electromagnetic flow meter used?
In a magnetic flowmeter, a magnetic field is generated and channeled into the liquid flowing through the pipe. Following Faraday’s Law, flow of a conductive liquid through the magnetic field will cause a voltage signal to be sensed by electrodes located on the flow tube walls.
What is flow meter explain its working principle with suitable diagram?
Working Principle : As the conductive liquid passes through the electromagnetic field, an electric voltage is induced in the liquid which is directly proportional to its velocity. This induced voltage is perpendicular to both, the liquid flow direction and the electromagnetic field direction.
What is electromagnetic flow meter explain its construction working with its limitations?
Construction of Electromagnetic Flow Meter Electromagnetic flow meter consists of electrically insulated or non-conducting pipe such as fiber glass. A pair of electrodes is mounted opposite to each other and flushes with the inside wall of pipe carrying the fluid, whose flow is to be measured.
Why does a magnetic flow meter need grounding?
Grounding rings are used to suppress electrical interference at the installation location for electromagnetic flow meters. Use of grounding rings significantly reduces electrical noise and may be necessary for proper operation of electromagnetic flow meters installed in lined or non-conductive pipes.
How flow is measured with electromagnetic flow meter with diagram?
Magnetic flow meters works based on Faraday’s Law of Electromagnetic Induction. This voltage is detected by sensing electrodes mounted in the Magflow meter body and sent to a transmitter which calculates the volumetric flow rate based on the pipe dimensions.
Which of the following is applicable for the electromagnetic flow meter?
Which of the following is applicable for the electromagnetic flow meter? Explanation: Electromagnetic flow meters don’t cause obstruction to flow and can be used for measurement in slurries. Explanation: Electromagnetic flow meters are insensitive to quantities like viscosity, density, and temperature of liquid etc.
What is reference electrode in magnetic flow meter?
An magnetic flow meter is provided which includes a reference electrode configured to electrically couple process fluid flowing within a flowtube of the flow meter. The reference electrode is adapted to measure potential of the process fluid.
What is the purpose of a flowmeter?
A flow meter (or flow sensor) is an instrument used to measure linear, nonlinear, mass or volumetric flow rate of a liquid or a gas.
What is the limitation of the magnetic flow meter?
The only real limitation of the electromagnetic flow meter is that the measured fluid media must be electrically conductive (> 5μS/cm). Non-conductive fluids, such as oil and other petroleum-based fluids, cannot be measured with mag meter technology.
What is the advantage of electromagnetic flow meter?
The electromagnetic flow meter provides rapid response to flow changes. It provides linear wide range. Measuring range setting can be optimized. It has ability to measure reverse flow.
What is the flow principle behind magnetic flow meters?
The flow principle behind magnetic flow meters is known as Faraday’s Law, mathematically defined as E=k*B*D*V. The induced voltage (E) is directly proportional to the velocity (V) of the fluid moving through the magnetic field (B). The induced voltage is carried to the transmitter through the electrode circuit.
How does a magflow meter detect voltage?
This voltage is detected by sensing electrodes mounted in the Magflow meter body and sent to a transmitter which calculates the volumetric flow rate based on the pipe dimensions. [E is the voltage generated in a conductor, V is the velocity of the conductor, B is the magnetic field strength and L is the length of the conductor].
What is Faraday’s Law in magnetic flow meters?
As applied to the design of magnetic flow meters, Faraday’s Law indicates that signal voltage (E) is dependent on the average liquid velocity (V) the magnetic field strength (B) and the length of the conductor (D) (which in this instance is the distance between the electrodes).
How do you calculate the flow rate of a magnetic field?
– to the velocity of the conductor (V) – to the length of the conductor (D) – to the strength of the magnetic field (B) E = k * B * D * V Theory of Operation: Faraday’s Law Volumetric Flow: Q = V * A Where: Q = Flow rate V = Velocity A = Area Faraday’s Law: E=kBDV V = E/kBD