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Farai
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Join Date: Dec 2010
Posts: 1

How to Find Process Gain and Time

06/03/2011 12:38 AM

Guys i am modeling the closed loop response for temperature control on coolers. The controller is a PID (Proportional-Integral-Derivative) controller. Wanted to ask how do i determine the process gain and time for the cooling process. Also of importance is how do you find the transfer functions of a RTD (Resistance temperature detector) and control valve.
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: how to find process gain and time

06/03/2011 4:03 AM

The process of determining the controller terms is called tuning. It is a process carried out by the Instrument Engineer setting-up the loop.

It can be done theoretically using some mathematics that is sometimes available for study in the third year of a Chemical Engineering degree.

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Banana86
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Join Date: Nov 2010
Location: Malaysia
Posts: 64
#2

Re: How to Find Process Gain and Time

06/09/2011 12:03 AM

You can try the Ziegler Nichols method

http://en.wikipedia.org/wiki/Ziegler%E2%80%93Nichols_method

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