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Control Engineers,
I am looking to automate the control pH. Currently, manufacturing operators test pH of a container. If the pH is low, caustic is added and if the pH is high, acid is added until the desired setpoint is reached. If overshoot occurs, then the appropriate caustic/acid is added to achieve the setpoint.
I am looking at 2 possibilities:
1) a pH probe in the container (could be 10 liters capacity or a 1000 liters capacity) reads the pH and the H+ ion concentration. A caustic inlet to the container, and a acid inlet to the container to add the necessary amount to satisfy the set pH.
2) a sample of the process fluid is taken from the container via a robot. pH control is then done on the sample. The appropriate proportioned amount would then be added to the container.
Have any of you experienced/know of someone who has done this sort of control? I would appreciate any feedback.
Regards,
Dai Ly
[email protected]
I am looking to automate the control pH. Currently, manufacturing operators test pH of a container. If the pH is low, caustic is added and if the pH is high, acid is added until the desired setpoint is reached. If overshoot occurs, then the appropriate caustic/acid is added to achieve the setpoint.
I am looking at 2 possibilities:
1) a pH probe in the container (could be 10 liters capacity or a 1000 liters capacity) reads the pH and the H+ ion concentration. A caustic inlet to the container, and a acid inlet to the container to add the necessary amount to satisfy the set pH.
2) a sample of the process fluid is taken from the container via a robot. pH control is then done on the sample. The appropriate proportioned amount would then be added to the container.
Have any of you experienced/know of someone who has done this sort of control? I would appreciate any feedback.
Regards,
Dai Ly
[email protected]