Repeatability or Accuracy? What do you really need.

When choosing a flow meter for your application or OEM product you must carefully consider the most important factors for your situation. In the graphic below the term "precision" is used, but it is more correct to term this as repeatability.

Applications that have frequent human interaction or adjustments may be able to use a meter with low accuracy and high precision with the operator as the calibrator to shift the pattern back to the "bullseye". Sometimes a change in the fluid temperature or pressure can cause a meter to shift from "high accuracy/high precision" to "low accuracy/high precision" performance. Meters that correct for temperature and pressure changes will have better accuracy and precision than those without additional sensors for correction. The new NetFlow meter has sensors for both fluid temperature and pressure that are used for correction of the measured flow rate.