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Flowmeter Accuracy

Flowmeter Accuracy

 

Introduction to accuracy in flow measurement devices

Accuracy indicates how close the measured value is to the accepted or true value.

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The accuracy of flowmeters can be stated as:

· percent of full span

· percent of rate

Accuracy as Percent of Full Spann

Accuracy in percent of full span can be expressed as:

a% = a 100% / s                                (1)

where

a% = relative accuracy (%)

a = +/- absolute accuracy

s = full scale of the flowmeter

Example - Accuracy of Flowmeter in Percent of Full Span

If the absolute accuracy is +/- 10 kg/h - the relative accuracy at full scale 1000 kg/h can be calculated as:

a% = (+/- 10 kg/h) 100% / (1000 kg/h)

    = +/- 1%

The relativeaccuracy at full scale 100 kg/h can be calculated as:

a% = (+/- 10 kg/h) 100% / (100 kg/h)

    = +/- 10%

Accuracy as percent of Rate

Accuracy in percent of rate can be expressed as:

a% = a 100% / q                                (2)

where

a% = relative accuracy (%)

a = +/- absolute accuracy

q = flow rate

Example - Accuracy of Flowmeter in Percent of Rate

If the relative accuracy is +/- 1% of rate - the absolute accuracy at rate 1000 kg/h can be calculated as:

a = (+/- 1%) (1000 kg/h)

    = +/- 10 kg/h

The absolute accuracy at rate 100 kg/h can be calculated as:

a = (+/- 1%) (100 kg/h)

    = +/- 1 kg/h

 

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