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(Assuming you got a bit mixed up and those who pointed at these did put things as it should...) You gave no reason for this (process) setup - E.G. - Maintaining the tank level while - Receiving inflow (through the control valve)? - Supplying outflow (through the VSD pump)? Without answering...

The problem you share with us is well known. Unstable feed cause unstable flue gas content. There are several approaches: - Try to install analyzers in the (earliest possible) key points where the process stream can be characterized (as Dave did recommend!) and build a cascade setup to (try to)...

You have a classic "dead time" case. The simple way to approach it is by s l o w i n g the PID frequency (make it run once for half or third of the dead time in hand), and use "very small" gain for the TC loop. Feel free to contact me direct [email protected].

> Can anyone please provide some names of good books for an I&C engineer? Please contact [email protected]