Calibration of flow meters-data smoothening

[Ali768]

Hello

I have done some experimental research work and found out from data a kink (in the middle of the data )at the switching of the two flow meter lines (while using air)i.e. when i switch from low flowline to high flowline via controller. Obviously this is because of the low flowmeter is at highest value while the highflowrate meter is at the lowest so the uncertainity level is high at these region.

Now the problem is that I have use this data to calculate various other parameters and using this kink data results in kink in all paramters.

I was wondering if somehow i could smoothed the data so that kink of the flowmeters data is smoothened and does not appear on the various other paramters calculated.

Any suggestions/help will be appreciated

Aly

 

[m777182]

If you have an information to which instrument belong each measurement then you can construct a calibration curve that will be smooth over the entire range. On the lower range it will be calculated from flowmeter1 and on the upper one from flowmeter2 and you can make the curve continuously differentiable on the whole range. On the criticall range you should decide which instrument is more reliable and you can assign a weight function to each signal if you can measure with both flowmeters simultaneously. Of course you will use smoothed (=modeled) values of the flow in your calculations, not originally measured ones. If there is still some kick due to transient shock because of pneumatic switch it would be most simple to filter that particular measurement out.
m777182

 

[IRstuff]

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