Do you require rate measurement and/or totalization?.Key Questions to Ask when choosing a Flow Meter With sanitary or clean-in-place (CIP) regulations. Pneumatic power is available, if the area is classified for explosion hazards, or if there are other special requirements such as compliance The specifying engineer must know if vibration or magnetic fields are present or possible in the area, if electric or Is likely, whether sudden temperature changes can occur, or whether special precautions are needed during cleaning and maintenance, these facts, too,Ĭoncerning the piping and the area where the flow meters are to be located, consider: For the piping, its direction (avoid downward flow in liquidĪpplications), size, material, schedule, flange-pressure rating, accessibility, up or downstream turns, valves, regulators, and available Whether flow can reverse, whether it does not always fill the pipe, whether slug flow can develop (air-solids-liquid), whether aeration or pulsation (abrasive or soft, size of particles, fibers), tendency to coat, and light transmission qualities (opaque, translucent or transparent?).Įxpected minimum and maximum pressure and temperature values should be given in addition to the normal operating values when selecting flow meters. In addition,Īll safety or toxicity information should be provided, together with detailed data on the fluid's composition, presence of bubbles, solids The fluid and its given and its pressure, temperature, allowable pressure drop, density (or specific gravity), conductivity, viscosity (Newtonian or not?)Īnd vapor pressure at maximum operating temperature are listed, together with an indication of how these properties might vary or interact.
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Requiring that the following types of data be filled in for each application: Download the Flow meter Evaluation Form. In order to approach this task in a systematic manner, forms have been developed,
Piping that will accommodate the flow sensor, should take place. If remotely, should the transmission be analog, digital, or shared? And, if shared, what is the required (minimum)ĭata-update frequency? Once these questions are answered, an evaluation of the properties and flow characteristics of the process fluid, and of the The first step in flow sensor selection is to determine if the flowrate information should be continuous or totalized, and whether this information Therefore, time shouldīe invested in fully evaluating the nature of the process fluid and of the overall installation.įirst Steps to Choose the Right Flow rate Meter The basis of good flow meter selection is a clear understanding of the requirements of the particular application.
The aqueducts of such early communities as the Sumerian cities of Ur, Kish, and Mari near the Tigris and Euphrates Rivers around 5,000 B.C. Information for all ancient navigators, and the ability to measure water flow was necessary for the fair distribution of water through Knowledge of the direction and velocity of air flow was essential Our interest in the measurement of air and water flow is timeless.