Magnetic Flowmeter Essay
Figure x is the hook-up diagram for electromagnetic transmitter used as the flow measurement device in MSM Johor Sugar Refinery. The diagram shows how electromagnetic flowmeter is installed at the 6” pipe for condensate fluid. For this instrument, the body sensor is installed at the pipe connected to the transmitter installed at stanchion with height of 1.5m. Transmitter is installed at the stanchion to avoid any damage due to hazardous process conditions such as high temperature or to ease the process of monitoring the flow.
Advantages of Electromagnetic Flowmeter
• Minimum pressure drop – unlike other flowmeter, electromagnetic flowmeter are not using any restriction to calculate the flow.
• No moving parts – less maintenance and mechanical
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Therefore magnetic flowmeter is often used for wastewater applications or any dirty liquid which is conductive or water based. Non
MAGNETIC FLOWMETER FLOW PRINCIPLES
Magnetic flowmeters (mag flowmeter) operates by the principle of Faraday’s Law of Induction to determine the flow of the pipe. Faraday’s law states that the voltage induced across any conductor as it moves at right angle through a magnetic field is proportional to the velocity of the conductor.
In magnetic flowmeter application, two field coils generate magnetic field across the pipe. Then, conductive fluid which acts similar like a conductor passes through the magnetic field produced by the two coils, therefore electrical voltage is induced. Induced current is directly proportional to the velocity of flow and the flow volume. Therefore, the flow information of the fluid is obtained.
Density of gases differs depending on the operating temperature and pressure unlike most liquids, they are incompressible. Flow of gas is normally measured in term of mass per unit time. However, the volumetric flowmeters does not measure the mass flow rate directly. Volumetric flowmeters require information on the density and volumetric flow rate of fluid to calculate the volumetric flow
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