# فلومتر-Flow measurement

فلومتر-Flow measurement

Flow measurement is the quantification of bulk fluid movement. Flow can be measured in a variety of ways. Positive-displacement flow meters accumulate a fixed volume of fluid and then count the number of times the volume is filled to measure flow. Other flow measurement methods rely on forces produced by the flowing stream as it overcomes a known constriction, to indirectly calculate flow. Flow may be measured by measuring the velocity of fluid over a known area

Both gas and liquid flow can be measured in volumetric or mass flow rates, such as liters per second or kilograms per second, respectively. These measurements are related by the material’s density. The density of a liquid is almost independent of conditions. This is not the case for gases, the densities of which depend greatly upon pressure, temperature and to a lesser extent, composition.

When gases or liquids are transferred for their energy content, as in the sale of natural gas, the flow rate may also be expressed in terms of energy flow, such as GJ/hour or BTU/day. The energy flow rate is the volumetric flow rate multiplied by the energy content per unit volume or mass flow rate multiplied by the energy content per unit mass. Energy flow rate is usually derived from mass or volumetric flow rate by the use of a flow computer.

In engineering contexts, the volumetric flow rate is usually given the symbol {\displaystyle Q}, and the mass flow rate, the symbol {\displaystyle {\dot {m}}}.

For a fluid having density {\displaystyle \rho }, mass and volumetric flow rates may be related by {\displaystyle {\dot {m}}=\rho *Q}.

### Liquid

For liquids, various units are used depending upon the application and industry, but might include gallons (U.S. or imperial) per minute, liters per second, bushels per minute or, when describing river flows, cumecs (cubic metres per second) or acre-feet per day. In oceanography a common unit to measure volume transport (volume of water transported by a current for example) is a sverdrup (Sv) equivalent to 106 m3/s.

معرفی فلومتر RSM

پرشر-سوئیچ

فلومتر بدنه فلزی با نام تجاری RSM ، از خانواده فلومترهای سطح متغیر با طراحی بسیار ساده ، قابلیت اطمینان کاری بالا، دقت مناسب و نصب راحت است. این نوع فلومتر مناسب برای اندازه گیری فلوی مایع و گاز می باشد.

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