Non Metered
Electromagnetic Flowmeter
Modern innovations in flow measurement incorporating electronic devices that can correct the variable pressure and temperature (ie density) conditions, nonlinear, and fluid characteristics.
An electromagnetic Flow meter, also known as an electromagnetic flow meter is a tool that measures the rate of flow of a liquid or solid suspended in a liquid through a pipe. Often, flow meters are used in wastewater treatment, food processing and medical industries. In general, the based on the conductivity of liquid solution or mixture being measured as it passes through a magnetic field and generate an electrical signal that can be used to measure flow volume.
As a substance must have electrical conductivity to be measured by an electromagnetic flow meter, these tools only represent approximately 20% of all meters used. Other types include the vortex flow meter and ultrasonic flow meter. An electromagnetic flow meter, however, often is noninvasive and generally do not restrict the flow to be measured. In addition, these devices tend to be very simple designed, almost no moving parts, so they require little maintenance and often have to be replaced.
There are a few different configurations Meter electromagnetic flux. They may have electrodes that protrude into the pipe through which flows measured substance. Coils on the outside of the tube to produce the field magnetic, while the electrodes pick up electrical energy generated. As long as the electrodes are not creating a layer of the substance being measured, which operate well.
Another type of electromagnetic flowmeter is completely non-invasive to the pipe. In this type, the electrodes are placed just on the outside and the coils are still generating a magnetic field. One advantage of this is that liquid being measured does not cover the electrodes. Furthermore, these flow meters can be used in closed systems of pipes, which are sometimes necessary to maintain purity and sanitation.
When an electromagnetic flow meter is used, must be properly grounded. Otherwise, you can pick up electrical interference often referred to as the noise and the flow reading is not accurate. This can be a particular problem when the pipes are plastic, as they tend to generate electricity static. Several configurations of ground is used, depending on the flow meter and piping design.
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David Mayo-Non-metered Auditing-February 8, 1986 – part 1of11.avi
