Efficient Venturi Tube Calibration for Digital Peak Flowmeters | Thesis Design

[CadisEtramaDiRaizel]

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.

 

[Nidum]

Bucket

 

[CWatters]

Theoretical 610L/min vs experimental 535L/min.

Big bucket.

 

[CadisEtramaDiRaizel]

Big bucket.

But it's airflow, wouldn't the nature of the fluid ( being water or any other liquid) impact calibration?

 

[CadisEtramaDiRaizel]

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

 

[CWatters]

What did you use to calculate the current error rate?

 

[CadisEtramaDiRaizel]

What did you use to calculate the current error rate?

A chart.
http://patient.info/health/asthma-peak-flow-diary

 

[CWatters]

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®."

 

[CadisEtramaDiRaizel]

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