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The Importance of Understanding About the Positive Displacement Flow Meter

Aug 17, 2007
Understanding about the positive displacement flow meter is an incredibly important matter, and most people actually do not even know what a displacement flow meter is to begin with. What a positive displacement flow meter does is it measures the volume or flow rate of a moving liquid or gas, and it does this by dividing the media into fixed, metered volumes.

A positive displacement flow meter consists of a chamber that basically obstructs the media flow from that of a rotating or reciprocating mechanism that allows the passage of fixed volume amounts, and the number of parcels that pass through the chamber thus determines the particular media volume.

The two Different Types of Positive Displacement Flow Meters

In regards to the displacement flow meter, there are two basic different types: sensor-only systems and complete sensor systems. With the sensor-only systems, these are switch-like devices that provide output for processors, controllers, or data acquisition systems, whereas with complete sensor systems, these are able to provide that of additional capabilities, such as an integral display and a user interface.

However, although there are obviously differences between the two types, they also have similarities, such as the fact that for both types, performance specifications include that of operating pressure, temperature range, maximum material density, connection size, and percent accuracy, for instance.

There are also several different types of metering technologies in this regards, and these should also be taken fully into consideration; there are gear meters, for instance, which have two rotating gears with synchronized close fitting teeth, and then there are oval gears which are commonly used due to the fact that shaft rotation can then be monitored in order to obtain specific flow rates.

Then there are also vortex meters, which are able to measure the frequency with which the vortices are shed from a bluff body that is placed in the flow stream; furthermore, typically it is found that the frequency will be proportional to that of the material velocity. Then there are nutating disk meters, and these use media pressure in order to rock a disc in a circulating path, without of course causing the disc to rotate about on its own axis.

Once you learn at least the basics about this item, you will then be able to understand more as you learn more about it. The most important thing to remember is to take your time when informing yourself on a matter such as this, so that you fully understand what you are learning about.
About the Author
For more information on positive displacement flow meters visit http://www.FlowMeterBasics.com/ or http://FlowMeterBasics.blogspot.com/
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