J
Hello Everyone,
I currently have a job with a customer that wants to operate an injection pump for Sodium Hypochlorite injection using a PID as follow.
"The control should depend on the finished water storage tank free chlorine concentration and the permeate flow rate. A setpoint for free chlorine concentration in the finished water storage tank should be made adjustable for the operators, a PID control shall be used to adjust the pump speed so that the desired chlorine concentration is maintained"
From the controls description I'm thinking a cascade PID, but from what I been reading a PID is usually does not work because of the locations of the injection and the location of the analyzer.
I have not done a chemical dosing system does anyone have any samples logic or point me to the right direction.
The application if for a water treatment plant.
[Well], [Iron/Manganese Removal Filter], [Two Stage RO System], [Finished Water Storage Tank], [Distribution System].
The injection points are as follow.
[Well] --> [Filters] ---> [RO] --> [FLOW Transmitter] --> [Injection Points] --> [Finished Storage Tank with CL2 Analyzer]--->[Distribution System]
The permeate water will be injected with Sodium Hypochlorite and Sodium Hydroxide. The CL2 Analyzer is measuring the Free Chlorine inside the storage tank.
Thanks for the Help.
I currently have a job with a customer that wants to operate an injection pump for Sodium Hypochlorite injection using a PID as follow.
"The control should depend on the finished water storage tank free chlorine concentration and the permeate flow rate. A setpoint for free chlorine concentration in the finished water storage tank should be made adjustable for the operators, a PID control shall be used to adjust the pump speed so that the desired chlorine concentration is maintained"
From the controls description I'm thinking a cascade PID, but from what I been reading a PID is usually does not work because of the locations of the injection and the location of the analyzer.
I have not done a chemical dosing system does anyone have any samples logic or point me to the right direction.
The application if for a water treatment plant.
[Well], [Iron/Manganese Removal Filter], [Two Stage RO System], [Finished Water Storage Tank], [Distribution System].
The injection points are as follow.
[Well] --> [Filters] ---> [RO] --> [FLOW Transmitter] --> [Injection Points] --> [Finished Storage Tank with CL2 Analyzer]--->[Distribution System]
The permeate water will be injected with Sodium Hypochlorite and Sodium Hydroxide. The CL2 Analyzer is measuring the Free Chlorine inside the storage tank.
Thanks for the Help.