Can a Flow Meter with Wide Scale Graduations Have Accurate Repeatability?

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SUMMARY

A flow meter with scale graduations of 2 units apart, such as the Omega FL1500, can still advertise a repeatability of 0.5% of the Full Scale, which translates to a precision of 0.5 units at full scale. The discussion highlights that while the scale's graduation may seem coarse, the internal mechanism ensures that the readings can consistently return to within this specified tolerance. The concern raised is about the practical implications of such graduation spacing on user experience and measurement accuracy.

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rollingstein
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Can a flow meter whose scale has graduations only 2 units apart (e.g. 90,92,94,96,98,100) have a legitimate advertised repeatablity of 0.5% of the Full Scale?

The scale runs 0 to 100 so that'd mean readings repeatable within 0.5%. When marks itself are 2 units apart how does this make sense?

In particular, I was referring to this instrument:

http://www.omega.com/Green/pdf/FL1500.pdf
 
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That means that for a given flow, the bob will always return to within .5% the same spot every time. Not sure how the spacing of the scale lines could possibly effect that.
 
Integral said:
That means that for a given flow, the bob will always return to within .5% the same spot every time. Not sure how the spacing of the scale lines could possibly effect that.

In the sense, if you do not have a fine enough spacing of scale lines how do you know it returned to the same spot or how close to the same spot.

I guess an external mark, but to a user of the instrument isn't any repeatablity less than the minimum scale graduation a lost metric. How can he use it?
 

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