Different Types of Water Flow Meters Just like the name suggests, a flow meter is an instrument used to measure linear and nonlinear, mass or volumetric flow rate of a liquid or gas. In this case we look at water flow meters. Flow measurement is the quantification of bulk fluid movement. Flow can be measured through measuring the velocity of a fluid over a known area. Factors such as; spare parts availability, familiarity of personnel with the device, and their experience with calibration are what one should consider in choosing water flow meters. Evaluating the nature of the process and of the overall installation fully, time should be invested. This helps a person to choose a good flow meter. Whether the flow information should be continuous or totalized and whether the information is needed remotely or locally is what one should determine first while choosing a flow meter. An evaluation of the fluid process and of the piping that will accommodate the flow meter takes place after asking these questions. Included in the different types of flow meters, is mechanical flow meter and it works on the principle of positive displacement. Piston meter or a rotary piston is the most used in domestic measurement of water. It works by a piston rotating within a chamber and for each rotation some amount of water passes.
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Another type is an oval gear meter. Herein fluid gets into one chamber then into a measurement chamber and then to the outlet. Fluid is metered in alternating measurement chambers as the cycle continues. Permanent magnets in the rotating gears transmit signal to an electric reed for flow measurement. They are not as precise as sliding vane design though claims are made for high performance.
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The difference between an oval meter and a gear meter which is the other type is that measurement chambers are made of gaps between the gears and the teeth. The other type of flow meter is helical gear flow meter. The rotation of rotors happens in a continuous fashion hence flow rate is measured in this way. There is a variable area meter and can also be called a rotameter. This type of a meter consists of a tapered tube mostly made of glass with float inside which is pushed by fluid flow and pulled down by gravity. To determine whether the float is stuck or not, the user is helped by some floats which are designed to spin visibly in the fluid stream. This is the commonly used meter with water. Turbine flow meter, nutating disk meter, single jet flow meter, multiple jet flow meter, Woltman flow meter and many others are other types of flow meters just to mention a few because the list is endless.

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