Question What is the difference between uncertainty and accuracy in flowmeters? Why do custody transfer ultrasonic flowmeter manufacturers state uncertainty value instead of accuracy? A. Rahimia.email@example.com Answer Accuracy (or more precisely, "inaccuracy" or error) can be defined as the closeness of the result of a measurement to the true value of the measurand. Unfortunately, we never know what that "true value" is, because there is no such thing as a perfect detector. Uncertainty should reflect this, by using the term uncertainty as the sum of the inaccuracies of the instrument and of the reference. Unfortunately, some vendors play "specmanship" with these terms,…Full Story
A detailed understanding can pay off in greater process stability, lower valve wear and less waste of materials and energy.