Comparison of Flow Meters


A comparison table of commonly used flow meters based on the viscosity of fluids that they can handle and for which type of fluid they are suitable, working conditions, accuracy, range are given below
Sr no
Type
Viscous liquid
Slurry
Gas
Output
Pressure
loss
Accuracy% full scale
Full range
1
Orifice
Limited
Poor  
Good
Square root characteristic
High
±0.5to ±2%
10-3to 5.5×103 m3/hr
2
Venturi
Limited
Limited
Good
--do--
Minimal
±0.5to ±3%
1to 5.5×103 m3/hr
3
Flow nozzle
Limited
Limited
Good
--do--
Minimal
±0.5to ±3%
1to 5.5×103 m3/hr
4
Pitot tube
Poor
Poor
Good
--do--
Poor
±5to ±10%
10 to 104 m3/hr
5
Electromagnetic
Good
Good
Good
Linear
Minimal
±2to ±5%
5.5×104 to 4.95×103 m3/hr
6
Variable area meter
Limited
Limited
Good
Linear
Average
±0.5%
10-7to 5.5×103 m3/hr
7
Positive displacement
Good
Good
Good
Linear
Minimal
±0.5to ±1%
10-5to 5×102 m3/hr
8
Turbine
Limited
poor
Poor
Linear
Minimal
±2to ±5%
05 to 4.95×102 m3/hr