Differential Pressure Flow meter Accuracy & Rangeability

Performance of a head-type flowmeter installation is a function of the

  • precision of the flow element and
  • the accuracy of the d/p cell

On average, flow element precision is expressed in percentage of actual reading terms, whereas d/p cell accuracy is stated as a percentage of calibrated span.

A d/p cell typically provides accuracy of ±0.2% of the calibrated span. With no detrimental effect on accuracy, rangeability of a flowmeter can be extra enhanced by employing several d/p flowmeters in parallel runs…

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