| Summary: | Historical interest in flow measurement can be traced back for more than a thousand years but it was less than four hundred years ago that the first principles began to be understood. The initial incentive to measure flow was the need to charge consumers and this led to the early development of positive/semipositive and inferential type integrating meters. Later, towards the end of the 19th century, measurement of flowrate became important for industrial and utility purposes. Pressure differential techniques held sway to satisfy this demand until about 1950 when alternative methods started to become available. Currently there are about sixty different flow measuring techniques in use to meet the ever-increasing requirements for domestic, custom transfer and industrial flow measurement of liquids, gases, vapours and solids in single or polyphase form.
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