1. Vortex basic principles
10/3/2017
Vortex basic principles
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2. Vortex measurement f = Vortex frequency V = Volume flow f ~ V
10/3/2017
Vortex measurement
f = Vortex frequency
V = Volume flow
f ~ V
Bluff Body
DSC Sensor
Transmitter
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3. Vortex – a universal principle
10/3/2017
Vortex – a universal principle
Steam
Liquids
Gases
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4. Vortex sensing element: DSC sensor
10/3/2017
Vortex sensing element: DSC sensor
Capacitive sensor
Primary vibration compensation (center of gravity)
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5. 10/3/2017
Minimum flow limits
Physical limits based on principle ( Karman street)
1) Depending on density
Example: Water
Example: 0°C, bara
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6. Minimum flow limits 2) Depending on Reynolds-Number
10/3/2017
Minimum flow limits
2) Depending on Reynolds-Number
NOTE: linear measuring range starts at Re=20’000!
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7. Maximum flow limits Liquids Gas / Steam
10/3/2017
Maximum flow limits
Liquids
9 m/s flow velocity
Gas / Steam
DN15: 46 m/s
DN25 and DN40: 75 m/s
DN50…DN300: 120 m/s (factory calibrated up to 75 m/s)
Use Applicator for the flow sizing / physical limits
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8. 10/3/2017
Main sensors
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9. 10/3/2017
Reduced inlet runs
Downstream of reducers and elbows (cases 1, 4, 5, 6) inlet runs can be reduced to 10D electronically (only 0.5% additional uncertainty)
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10. Test results electronic inlet run compensation
10/3/2017
Test results electronic inlet run compensation
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11. Test results electronic inlet run compensation
10/3/2017
Test results electronic inlet run compensation
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12. Saturated Steam / Wet Steam
Tony Donnelly

13. Wet Steam Measurement
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14. Prowirl 200 is optimized for steam applications!
Prowirl 200 helps!
Prowirl 200 helps!
Prowirl 200 is optimized for steam applications!
Wet steam detection
100% steam quality
Worldwide unique
One of its kind warning
Stepping stone to “wet steam measurement”
Patented! 
80% steam quality
Ruud Helders PMF

15. Safety and steam and water hammer
Wet steam leads to steam and water hammer and can be very dangerous causing explosions. From a health & safety point of view we can provide our customers with a variety of “wet steam”, “phase change” and “wet steam detection” warnings and alarms all described in detail in the following slides.
Uniquely, we can also measure steam dryness fraction “online” – and for the line sizes and steam conditions for which we can provide this invaluable parameter see slide 12.
Some examples of the damage that can be done by water hammer!
Luckily nobody was injured on right.
Tony Donnelly

16. Superheated steam and gas – pressure input required!
Prowirl 200 helps!
Superheated steam and gas – pressure input required!
Pressure can be read in via 4-20 mA, HART, Profibus or FF
Alternatively, a fixed value for pressure can be assumed
Only available with “Mass flow” option
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17. Questions?
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18. Thank you very much for your attention
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