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I want to buy a PID controller. What should be the specifications of such a controller. As of now I only know that it has to input one parameter and output one PID 4-20mA depending on the values of Kp, KI and KD and the error signal. For such a controller what should be the specifications needed.
Does the choice of PID controller also has to depend on the type of final control element. What difference will it have to have if the final control element is a hydraulic power cylinder or pneumatic power cylinder or a pneumatic control valve. Can I not buy a general PID and tune the parameters for the different final control elements and loop responses?
In market PID controllers are available for a whole range of price bands. I want specs that are for just one input/output with a couple of alarm relays. That's all. What fine technical points should I look for while comparing two similar PIDs with a huge price difference?
Any help would be appreciated.
teena
Does the choice of PID controller also has to depend on the type of final control element. What difference will it have to have if the final control element is a hydraulic power cylinder or pneumatic power cylinder or a pneumatic control valve. Can I not buy a general PID and tune the parameters for the different final control elements and loop responses?
In market PID controllers are available for a whole range of price bands. I want specs that are for just one input/output with a couple of alarm relays. That's all. What fine technical points should I look for while comparing two similar PIDs with a huge price difference?
Any help would be appreciated.
teena