Hello all,

This question is maybe very easy but I haven't found it out myself yet.

In a membrane process I have two feed streams. I want to maintain a constant pressure difference between these two streams and in case of a disturbance the flow of one of the feed stream must be adapted.

Which kind of controller can I use? It is not really a ratio I guess so ratio controller wont probably do it?

Thanks

 

It sounds like all you need is a bias, similar to ratio. You measure one pressure, subtract the desired difference, and use the result as the setpoint for the "wild" pressure.

We (SMAR) make a controller that can be configured for this and other type of control strategies:
https://www.smar.com/products/cd600.asp

Kindly contact me on the address below.

Jonas Berge
SMAR
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[email protected]
www.smar.com
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