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you may be dealing with a winding failure, check your motor shop, and do the winding insulation testing when you get a chance.

Brine in a closed loop? Are you measuring sea water or some other fluid. Also, since the fluctuations begin at higher valve openiings, are you dealing with multi phase flose (air pockets, etc.).

the short answer is yes,

more to do with liquids which are anything but chemically pure single component substances.

heat tracing is regarding asphaltic depositions, otherwise liquid purges are require per a previous suggestion or alternative system design with may not be your option

Pitot measurement will work in your case

sounds like a transmitter failure.

Magflow meters rely on flowing conductive fluid. The current flow is minimal so unless you have a non-conductive buildup on the electrodes, you'll get a reading. There are a variety of insitu electrode cleaners.

It is a bit more complex than Laplace transforms. For example, how many trays or in the column?

"The analog inputs are all loop powered in our case and use a non-incendive power supply." Sounds you are getting ground loop surges, from the field (motor starts, etc.). The field grounding, can really show extreme voltages relative to the control room/DCS grounding. We were seeing several...

siraj, are your RTD's sheathed? If so is the sensor electrically connected with the sheath, so called grounded tip sensors?

if flame out is detected, shut the main fluels feeding the burner. burner logic beyond that is a detail engineering issue, well beyond a forum response

state the pressure, temperature, and the fluids involved, and whether single phase or not.

Didn't watch the vid, but am familiar with the Smith predictor, adaptive controls and various matrix methods for continuous and discrete time systems

Interesting class, root locus plots come in handy too with excel and visual basic, the hysterisis mentioned involved occasional valve stem binding.

we had several submariners mechanical managers in the power house, too, they do know how to deal with the plant environment, and smart!

does pole placement address valve hysterisis?

wait until you turn a controller in a heat exchanger loop, it is a multidimensional universe in that case, beyond pole locations, or even more challenging a steam dearator in a boiler feed water loop, with flow, pressure, drum lever, and emergency feed water...every thing is logical and rational...

The Smith Predictor is not always effective, and a derivative action to speed things up only work in a narrow range of applications where you have servo controls (robotics and related automation), minimal dead time, instant measurements, and minimal time constants, but generally ineffective in...