Process Control and Instrumentation
Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their

Low flash point
High viscosity index
Low electrical conductivity
Low thermal conductivity

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Process Control and Instrumentation
For a feed back control system to be stable, the

Bode plots of the corresponding open loop transfer function should monotoni-cally decrease
Poles of the closed loop transfer function should lie in the left half of the complex plane
Roots of the characteristic equation should be real
Poles of the closed loop transfer function should lie in the right half of the complex plane

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