22 Lessons Learned: Meters

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Types of Water Flow Meters A flow meter just like the name suggests are instruments used to measure linear and non-linear, mass or volumetric flow rate of a liquid or gas. Water flow meters is what we look at in this case. The quantification of bulk fluid movement is fluid measurement. 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. To choose a good flow meter this helps a person. While choosing a flow meter one should first, determine whether the flow information should be continuous or totalized, and whether this information is needed locally or remotely. After asking these questions, an evaluation of the fluid process and of the piping that will accommodate the flow meter takes place. There are different types of flow meters and they include; mechanical flow meter which generally, work on the principle of positive displacement. In domestic measurement of the piston or rotary meter is mostly used. Pistons rotating within a chamber is how it works and with each rotation some amount of water passes.
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An oval gear meter is another type of flow meter. Fluids get into one chamber herein, then into a measurement chamber and then to the outlet. Fluid is metered in alternating measurement chambers as the cycle continues. In the rotating gears there are permanent magnets that transmit signal to an electric reed for flow measurement. High performance claims are made but they are not as precise as sliding vane design.
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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. Flow meter’s other type is helical gear flow meter. The rotation of rotors happens in a continuous fashion hence flow rate is measured in this way. The variable area meter is also called a rotameter and it is another type. 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. So as to help the user determine whether the float is stuck or not, some floats are designed to spin visibly in the fluid stream. With water the commonly used meter is this. Though the list is endless, just to mention the other types of flow meters are, multiple jet meter, single jet meter, nutating disk meter, turbine flow meter, Woltman flow meter and many more.