Regarding split range controller: Is it normal to have a control valve with two different sizes? Why use a split range controller and where can we it? My application: I am planning to use at outlet of condenser. The outlet will have condensate liquid and non-condensate vapor. Will it work here?
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Greg McMillan Forum Moderator 34 Posts
Re: Can you explain a split range controller?12 August 2011 at 1:29pmSplit range is a control configuration where a single PID controller outputs to two control valves that are usually not the same size, but could be. In most split range applications, the controller is adjusting the opening of one of the valves when its output is in the range of 0 to 50% and the other valve when its output is in the range of 50% to 100%. For a detailed discussion of split range, refer to Advanced Process Control: Beyond Single-Loop Control by Cecil L. Smith, published by John Wiley & Sons, 2010. Chapter 3 is dedicated to split range control.
An example of a split range application is controlling the temperature of a vessel with both a heating mode and a cooling mode. One control valve adjusts the rate of heating; the other control valve adjusts the rate of cooling.
The description of your application is rather sketchy, but I doubt that split range is appropriate.