Process Control and Instrumentation
Radiation pyrometers as compared to thermocouples

Can't measure the temperature of moving objects
Can measure higher temperature
Is more affected by corrosive atmosphere
Has a slower speed of response

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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 right half of the complex plane
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

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