Efficient Venturi Tube Calibration for Digital Peak Flowmeters | Thesis Design

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CadisEtramaDiRaizel
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I've designed a venturi tube for my thesis ( Design of a digital peak flowmeter). I was wondering if there was a way to calibrate the flowrate, without using a measured flowrate producing device. The current error is about 12.3%. Theoretical 610L/min vs experimental 535L/min.
 

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CWatters said:
Big bucket.
But it's airflow, wouldn't the nature of the fluid ( being water or any other liquid) impact calibration?
 
CadisEtramaDiRaizel said:
I've designed a venturi tube for my thesis ( Design of a digital peak flowmeter). I was wondering if there was a way to calibrate the flowrate, without using a measured flowrate producing device. The current error is about 12.3%. Theoretical 610L/min vs experimental 535L/min.
Forgot to add, that it's used to check asthma parameters
 
So you compared the flow rate recorded by your new digital peak flowmeter with the flow rate measured by another device and recorded on a chart?

How do you know which is more accurate?

Google found..

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2882540/

"Comparison of five portable peak flow meters"

From the Results..

"The percent error for the spirometric values for each meter was 5.1% for Air Zone®, 1.9% for Assess®, 11.2% for Galemed®, 6.5% for Personal Best® and 3.0% for Vitalograph®."
 
CWatters said:
So you compared the flow rate recorded by your new digital peak flowmeter with the flow rate measured by another device and recorded on a chart?

How do you know which is more accurate?

Google found..

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2882540/

"Comparison of five portable peak flow meters"

From the Results..

"The percent error for the spirometric values for each meter was 5.1% for Air Zone®, 1.9% for Assess®, 11.2% for Galemed®, 6.5% for Personal Best® and 3.0% for Vitalograph®."
Then how do I calibrate my results? Thanks