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To reduce consumptions and therefore expenses: in short to leave better. Often a higher accuracy in flow measurements means to produce much better at lower prime costs. Otherwise it may happen that lack or inaccuracy of flow measurements can cause damages or disappointing results. To select a flowmeter is therefore very important. It is experts opinion that over 75 percent of the flowmeters do not give satisfactor performances. And improper selection accounts for 90 percent of these problems. The most important requirement is knowing exactly what the instruments is supposed to do. Some questions to consider: - Repeatability of process control - Linearity - high accuracy of accounting or custody transfer - Local indication or remote signal - On-Off or proportional outs - Clean or slurry or viscous liquid (electrically conductive or no) - Specific gravity or density - Range flow rate - Piping requirements - And so on Specification sheets are designed from supplier to obtain the crital information necessary to match the correct flowmeter to the job of the customer. Another important consideration for electrical components in hazardous areas: the flowmeters must be offered in intrinsically safe. All flowmeters require an initial calibration. Qualified technicians are available at the supplier to perform calibrations for the specified conditions of customer. A number of factors influence requirements of maintenance of flowmeters. Insufficiently selected devices invariably will cause problems at an early date. Flowmeters with no moving parts usually will require less attention than unites with moving parts. If the liquids is dirty or viscous, periodic internal inspections are required in especially in flowmeters with moving parts. Electromagnetic flow meter is ideally suited for flow measurement of liquids, slurries and pastes with minimum electrical conductivity of microS/cm. Liquid steam flow meters. Turbine meters are volumetric meters for low viscosity non-aggressive fluids, gases, pharmaceutical fluids and liquefied gases. Turbo meter in wide range of fluid application: water, oils, solvents, acids, in water treatment systems. Liquid steam flow meters. Oval gear meters - Oscillation piston meters - Nutating disc meters: for mineral oils, hydraulic oils, solvents, brake fluids, coolants, etc. Micro flow meters: additive, aromatic substances, perfumes, liquefied gases, demineralized water, fluid food, (Q=0,005...0,25 l/1') Electromagnetic flow meter is ideally suited for flow measurement of liquids, slurries and pastes with minimum electrical conductivity of microS/cm. Liquid steam flow meters. Ultrasonic flow meters (measurement principle: transit time) Differential pressure flow meters: the differential pressure, produced by passage of media inside pipe-meter, is detected to measure by means of mathematical equations, the flowrate of natural gas, steam, compressed air and all liquids Vortex flow meters (principle: karman vortex shedding street in the wake of body built into the pipeline): saturated steam, liquids, compressed air. Liquid steam flow meters Coriolis mass flow meters: measurement of mass flow, density, temperature and volume flow for fluids (e.g. PU components, paints and gases)
Article Source: http://www.bharatbhasha.net Article Url: http://www.bharatbhasha.net/advice.php/102694 Article Added on Wednesday, October 29, 2008 | ||||||||
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