RHEONIK Coriolis Flow Meter Presentation.pdf

Rheonik Presentation

1. Rheonik overview -

2. Rheonik company information
•Flow sensor design by Karl Kueppers in
1983 - announcement of patent
•1986 Foundation of RHEONIK GmbH in
Maisach close to Munich
•1993 Production moves to bigger facilities
in Odelzhausen close to Munich
•1993 to 2000 continuous business expansion
to a world wide known manufacturer of high
quality coriolis mass flow meter solutions

3. Rheonik company information
Rheonik facilities and production view
Continuous growth by innovative
solutions for the industry

4. Unrivaled FACT!
Rheonik coriolis mass flow meters can measure from:-
1,500 tons/hr
to
0.5 gram (0.02oz)/min

5. Coriolis theory
• Effect discovered by Gustave Gaspard
Coriolis around 1835
•Coriolis is an extension Newtonian theory
•Coriolis force – Inertial force exerted on
an object as a result of movement relative
to a rotating frame of reference
• Coriolis regarded the effect as the result
of a complementary centrifugal force due
to the rotation of the frame of reference
• Since 1835 have been applied to ballistic
missile trajectories, hydraulics, machine
performance, ergonomics, ocean and
atmospheric circulations

6. Coriolis theory
– Practical explanation
• Coriolis effect is apparent in
the path of a missile moving
longitudinally
• Missile moves along a north-
south path, undergoes apparent
deflection to the right (Northern
hemisphere)
North Pole
Equator
Intended
path
Target

7. • Two reasons:-
• The Earth rotates eastward
• The tangential velocity of a point
on the earth is a function of latitude
(velocity is essentially zero at the
poles and at its maximum at the
equator)
North Pole
Equator
Intended
path
Actual
path
Target moves
Coriolis
“deflection”
Coriolis theory
– Practical explanation

8. The Rheonik range –
coriolis with a twist!

9. •Measurement of liquids and gas
•Flow rates from 0.03 kg/h (1.1 oz/h) to
1,500,000 kg/h
•Diameters up to 12 inch / DN300
•Pressure over 890 bar (13,000 psi)
•Temperature from -200°C to +400°C (- 328°F to 750°F)
•Available in EEx ia IIC -EEx de IIC (Class 1, Div 1/2)
•Fiscal approval (OIML R117) and US Weights and Measures
•Available in stainless steel, Inconel, Monel
Hastelloy and tantalum
Only the RHEONIK range
has all these capabilities:-

10. Question. Why is it only the
RHEONIK range has these
capabilities?
Answer. Only RHEONIK have
the patented omega tube
design!

11. •Design permits increased tube
wall thickness
UNIQUE FEATURES – Omega form
• Active measurement
section is entire top
half of omega tube
•Acts as part of the
torsion swing system
•Requirement for
secondary
containment is
eliminated!

12. •Helps energise torsion
oscillation
•Guides tube
movement
UNIQUE FEATURES –
Patented torsion rod
• Minimises stress

13. •Reduces susceptibility
to external vibrations
•Stabilises torsion
movement
UNIQUE FEATURES –
Dual cross bar support
•Works in conjunction
with torsion rods to
generate harmonic
oscillation – tuning fork
perpetual motion

14. Pickup coils
Construction details
Removable flange
Manifold (also sealless available)
Tube loops
Drive coils

Mass bar
Torsion rod
Electrical junction box
Flange connections

15. Advantages of omega form
Torsion rods guide and
minimise tube stress as
movement is torsional
Other designs have a
bending motion which
significantly
increases stress and
is a cause of fatigue at
weld points resulting
in increased tube
fracture failures

16. •Omega form makes torsion
swinging movement possible
•Torsion is less vibration sensitive
- Vibration is horizontal or
vertical but not torsional thus
has little effect
•Omega tube bending is smooth
thus there is little pressure drop
(Unlike multi circle designs)
Advantages of omega form

17. •Permits operation at
higher pressures
•No loss of accuracy
under changing
pressure
conditions
Advantages - Increased
tube wall thickness
•Eliminates need for
secondary containment
required for some mass
flow meter designs

18. High–mass dual cross bar support
•Together dual mass bars and the
torsion rods form a spring driven
oscillation system –
harmonic
oscillation
like a tuning fork
•System balance such that it
approaches perpetual motion
- less than 300mW required to
power torsion movement
- little energy required so
intrinsically safe
Advantages of dual mass bar
support/torsion rods

19. High–mass dual cross bar support
•Torsion Rod / Mass Bar creates
large oscillation amplitude resulting
in excellent signal to noise ratio
•High mass allows continuous
operation even in the presence
of damping factors such as gas
bubbles or non- homogenous
media and vibration
Advantages of dual mass bar
support/torsion rods

20. Further advantages of shape
and wall thickness
•Measurement takes place in the
upper half of the tube which is
resistant to deformation
•Therefore output is unaffected by
line pressure changes
•Active measurement section
de-coupled from process
connection – vibration/
heat dissipation is
not a problem

21. Further advantages of shape
and increased mass
•Thick walls provide
safety margin
for corrosion &
or abrasion • Thick walls allow extreme
pressures & temperature
applications to be solved
- bending elements
require thin walls
which are subject to
breaking /fatigue

22. Time
O
u
t
p
u
t
1.5
1
0.5
0
-0.5
-1
-1.5
Pick off 1
Pick off 2
1 2 3 4 5 6
1 2 3 4
4
=
Pick off Coils at Zero Flow Condition
Operational theory - Flow
•Fundamentally sound operating
principle reduces requirement for
advanced diagnostics and
‘interpretation’ of data
•During zero flow output from the
pick up coils is 180
o
out of phase
•Torsion movement needs only
limited diagnostics to measure
flow accurately

23. Operational theory
•As flow is introduced coriolis forces
begin to act effecting the torsion
movement of the omega tube
Time
Force
2 3 4 5 6
Coriolis Force Induced by Flow

24. Operational theory
•Flows has upward momentum
& inertia as it travels round the
Omega
•This resists the motion of
the tube and causes torsion
•The sine waves of the two pick
off coils are thus effected by
the coriolis force

25. Time
Output
1.5
1
0.5
0
-0.5
-1
-1.5
Pick off 1
Pick off 2
1 2 3 4 5 6
1 2 3 4
4
=
Ti m e
Output
1. 5
1
0. 5
0
- 0. 5
-1
- 1. 5
P ick o ff 1
P ick o ff 2
1 2 3 4 5 6
1 2 3 4
=
Operational theory - Flow
•Coriolis forces cause a shift in the
signals from the pick off coils. This
Delta t is proportional to flow
Delta t

26. Operational theory - Density
• Clearly meter volume is known
at manufacture
• Omega tubes natural frequency
changes depending upon mass
of media contained
Mass
Volume
• Density =

27. Density measurement
• Omega volume is constant therefore
mass can only change as a result
density change
• Change in natural resonant
frequency of the Omega tube
is proportional to media density
• In practical terms an
increase in density will lower the
resonant frequency of the omega
tube

28. References
DOW

29. Summary
Patented OMEGA design is the basis
for the most advanced coriolis meter
available:-
• Rugged omega tube design
Only commercially available omega
coriolis meter with thick walled element
Reduced requirement to rely on
signal manipulation and processing
techniques
• Extreme applications
Up to 890 Bar (13000 psi)
Temperatures from -200°C to +400°C
(-328°F to 750°F)
• High accuracy
Units available for fiscal duties
• Low energy usage
EEx ia IIC (Class 1, Div 1)sensors
available
•Flexible configuration
Diameters from ½” to 12” stainless
steel, tantalum, hastelloy etc
•Proven technology
Extensive references
worldwide
Huge library of successfully
solved applications