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Turndown Ratio of aTurndown Ratio of a
Flow meterFlow meter
Why is it an important consideration when
selecting a flow met...
Turndown ratio – Flow meters
• Turndown ratio is a flow measurement term that
indicates the range of specific flow meter i...
Turndown ratio – Flow meters
• Example #1;
• If a gas to be measured varies between
100000m3/day and 1000000m3/day
• This ...
Turndown ratio – Flow meters
• If the flow meter had a maximum flow of
2000000m3/day then the required
turndown ratio (TR)...
Turndown ratio – Flow meters
• The turndown ratio is
• 12’’/ 0.25’’ = 48 i.e, (48:1)
• If the same ruler all the graduated...
Turndown ratio – Flow meters
• Note;
• Turndown Ratio is one of a number of
considerations when choosing or sourcing
for a...
THANK YOU !!!
Presentation prepared by ;
Benjamin Kyalo
Technical Sales Engineer
+254735211022
bwkkyalo06@gmail.com
www.go...
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Turn-down Ratio of a Flow Meter.

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

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Turn-down Ratio of a Flow Meter.

  1. 1. Turndown Ratio of aTurndown Ratio of a Flow meterFlow meter Why is it an important consideration when selecting a flow meter?
  2. 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. 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. 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. 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. 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. 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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