flow sensor

1. Presented by: Ayesha Nawaz
(M13-CE-35)

2.  Construction
 Working principle
 Applications

3. Definition
Construction
Types of tubes
Types of floats
Operating principle
Measurement
Equation of flow rate
Graph
Distinguishing Features
Applications
Limitations
Closing

4. Rota meter:
“A device used to measure flow rates of fluids in
a closed system”

5. •Tapered tube
•Float

6. Glass (for quick reading)
 Metal (for corrosive conditions)
 Plastic (for low cost)

8. •When fluid is entered into the tube, some of the fluid
strikes the float & some passes by.
•Ultimately, float moves upward until
Beyonce force = weight of the float
At this point, float will stop to move upward, float
position will indicate flow rate!
•Annular space increasing upward thus giving
More area , more flow, more upward
movement of float & hence more flow rate!

11. CD= co-efficient of discharge
G= Flow rate
g= gravitational acceleration
P= density of the fluid
Pf= density of the material of the float
Vf= volume of the float
Af= maximum cross sectional area of the float
A1= cross sectional area of the tube
A2= area of the annulus space

13. • Variable area meter
• Used for small flow rates
• Tmax = 400○C
• Pmax = 4MPa
• Low installation cost & investment cost
• No external power is required
• Cost Effective

14. •Food industry
•Fermentation
•Paper industry
•Oil & gas industry
•Chemical industry

15. Can’t be placed horizontal without amendments
 Only for transparent fluids otherwise use magnet
 Only for measuring small flow rates
 Can’t bear very high temperatures & pressures without
amendments

16. Video:

19. For measuring small flow rates like in laboratories
When low cost is required
When temperatures & pressures are not very high
Easy to install
Reliable
No fuel/power consumption

20. Chemical Engineering by Coulson & Richardson, Volume
1
Mechanical Variables Measurement By John G.Webster
 Flow meters & Flow measurements By P.Chattopadhay
 http://www.tech-faq.com/rotameter.html
http://www.slideshare.net/search/slideshow?searchfrom=header&q
=rota+meter
http://slideplayer.com/slide/2493605/