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Why is it an important consideration when selecting a flow meter?

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- 1. Turndown Ratio of aTurndown Ratio of a Flow meterFlow meter Why is it an important consideration when selecting a flow meter?
- 2. Turndown ratio – Flow meters • Turndown ratio is a flow measurement term that indicates the range of specific flow meter is able to measure with acceptable accuracy. • Turndown ratio can be expressed as; • TR = Q (max) / Q (min) • Where TR = Turndown Ratio • Q (max) = Maximum Flow • Q (min) = Minimum Flow
- 3. Turndown ratio – Flow meters • Example #1; • If a gas to be measured varies between 100000m3/day and 1000000m3/day • This specific application has a TR = 10:1 • The flow meter required should have a TR of at least 10:1
- 4. Turndown ratio – Flow meters • If the flow meter had a maximum flow of 2000000m3/day then the required turndown ratio (TR) would be 20:1 • Example #2; • Consider a 12’’ ruler graduated to a quarter of an inch.Since the smallest distance that could be measured is ¼’’
- 5. Turndown ratio – Flow meters • The turndown ratio is • 12’’/ 0.25’’ = 48 i.e, (48:1) • If the same ruler all the graduated lines below 2’’ are smudged, then in this case the turndown ratio would now be • 12’’ / 2’’ = 6 (6:1)
- 6. Turndown ratio – Flow meters • Note; • Turndown Ratio is one of a number of considerations when choosing or sourcing for a flow meter for your application • TR of a flow meter is mostly affected by the devices signal-to-noise ratio (S/N Ratio) which results from the fluid dynamics of the technology and the type of sensor employed.
- 7. THANK YOU !!! Presentation prepared by ; Benjamin Kyalo Technical Sales Engineer +254735211022 bwkkyalo06@gmail.com www.google.com/+BenjaminKyalo Nairobi, Kenya

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