Why Liquid Flow Measurement Is Vital To Processing
Flow measurement refers to the process used in the determination of the amount of flow through pipes and other types of enclosures
. This measurement may consist of things such as liquids, fluids, gases, as well as vapors. Some types of flow meters used for this purpose are differential pressure meters, mechanical flowmeters, electronic flowmeters, and mass flowmeters.
Measuring the flow of liquids can be one of the most critical actions within highly active process environments, such as industrial plants. Often, this type of measurement can mean the difference between a company experiencing a loss or making a profit. Furthermore, this type of measurement plays an important role within many health and safety protocol.
Differential Pressure Meters
Differential pressure meters, otherwise known as head meters include orifices, flow tubes, venturi tubes, as well as nozzles, and a variety of other meters including elbow tap, variable area, and also target meters, pitot tubes.
Any device used to measure differential pressure, utilizes the principle based on the idea that pressure drops across the meter and is proportionate to the square of the flow rate. Therefore, the determination of flow rate acquired by measuring the pressure differential in addition to extracting the square root.
In general, these are the most commonly used flow measurement devices. In most cases, installation performance of the head type flowmeter determines the accuracy. Increasing the range ability of the flowmeter, generally has no effect on the accuracy. However one way of doing this, involves the operation of several flowmeters running in parallel to one another.
Mechanical Flowmeters
There are many different types of mechanical flowmeters, otherwise known as positive displacement flowmeters. These types of meters work by isolating and counting the known volumes of a liquid or gas throughout the time it passes through the meter. One of the advantages of this type of flowmeter has to do with its accuracy. In addition, they do not need power in order for them to work.
Mechanical flowmeters are available in a number of different sizes. This type of flowmeter need to be used with clean process liquid. In addition, filtering must take place for the removal of any particles over 100 microns. One major drawback with the mechanical flowmeters has to do with how wear rapidly decreases their accuracy.
In consideration, they are a poor choice for abrasive liquids and slurries. A turbine flowmeter is one example of a positive displacement flowmeter. Some other examples of mechanical flowmeters are paddlewheel, shunt, and propeller flow meters.
Electronic flowmeters
The electronic flowmeters include measurement devices, which are magnetic, ultrasonic, as well as vortex. Although considered electronic, this does not indicate exclusive use of electronics. Flowmeters of this type, have no moving parts, which classifies them as non-intrusive. This contributes to them working well with some of the newer types of technologies.
Mass Flowmeters
Mass flowmeters tend to make the most critical measurements within a processing plant. Therefore, it is imperative for them to have a high amount of accuracy, in addition to reliability. Mass flowmeters have a number of moving parts, in addition to a complex mechanical design. This tends to give them the disadvantage of being complex in dynamics and also have a fairly high maintenance cost as well.
Generally, the mass flow can be determined by batch weighing. On the other hand, this measurement can be attained by combining it with another accurate level sensor with a densitometer. Furthermore, another method includes mounting the transmitter at different heights. A Coriolis mass flowmeter is one example of this type of flowmeter.
As you can see there are many meters on the market to perform different jobs. Just weigh up the costs and make sure you match the product to your application before making the final choice.
by: Andrew Long
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