What maximum and minimum flow rates need to be accommodated?.What is the expected temperature range?.The typical questions that need to be answered are : Reputable suppliers are usually happy to provide advice because it is sound business sense to help their customers avoid mistakes. It is always worthwhile asking your supplier to help you make the most appropriate selection, or to confirm the meter you have already chosen is suitable for the duty. The table should only be used as a rough guide because numerous local factors peculiar to each case need to be taken into account. In the paragraphs which follow, more detail is given on each technology. Table 1 provides a rough guide to the technologies applicable to various classes of measurement. Steam is a particular example of a gas with properties that make it hard to meter. Gases might also be at any temperature or pressure and they, too, may have solid material suspended in them (either as minor contamination, or as transported product). The term ‘liquids’ would encompass water and non-aqueous fluids such as oils, but these could be at elevated temperature or pressure, have aggressive materials dissolved or suspended in them, or be carrying entrained air bubbles for example.
The scope of this section is very broad because of the wide range of substances being measured, and the fact that any one metering technology will often be applicable to several different substances. Flow metering technology 1 Meters for liquids, gases, and solids in suspension
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