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FX-8500-1 Single
Loop Controller
"System Installation Requirements"
Foxcroft Equipment and Service Co., Inc.
2101 Creek Road
Glen Moore, PA 19343 USA
610-942-2888
FAX 610-942-2769
email sales@foxcroft.com
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System Installation Requirements
Selecting the appropriate injection and sample point locations for the
equipment is as important as picking the right hardware for the job.
Usually, the chlorine injection point has already been optimally placed for
the process.
Using this as a starting point, place the sample point downstream from the
injection point. If the sample point were placed upstream, the
controller would have to work in a "open-loop" control mode, where it should
blindly change chlorine dosage based on the set-point, but would never
actually "see" the results. This would cause the controller to
continuously increase the amount of chlorine. A downstream sample
point assures the controller "sees" the results of its chlorine control as
it maintains the desired set point.