Which of the following flowmeter specifications is superior

Which of the following flowmeter specifications is superior? Conduct a proper analysis/calculation to derive the correct answer.

A. 1.0 percent of rate

B. 0.25 percent of full scale

This is subjective. The choice will differ based on scale of the flowmeter and flowrate.

Suppose we have a 100 m3/sec flow rate in pipe that is being measured by a 100 unit full scale device.

Then.

For A: 1% of rate would be = 0.01*100 = 1

For B 0.25% of full scale = 0.0025 * 100 = 0.25

We see that the error is less in case of B.

But if the flow rate is less like 10 m3/sec with 100 unit full scale then

For A: 1% of rate would be = 0.01*10 = 0.1

For B 0.25% of full scale = 0.0025 * 100 = 0.25

In this case A is better.

Hence depending upon the flow rate and number of units in full scale, the choice of flowmeter would differ.