Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Patent
1993-03-18
1995-06-06
McCarthy, Neil
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
210742, 210746, 210753, 210 961, 210 97, 210 89, 210139, 210143, 210149, 364499, 364500, G05D 1108
Patent
active
054220149
ABSTRACT:
An automatic system to precisely maintain bactericidal action in a reservoir of water equipped with a recirculation system, such as a swimming pool, decorative fountain, spa, cooling water reservoir or the like. The automatic system includes: a service loop which bypasses a portion of the recirculating water past sensors which measure the pH and oxygen reduction potential (ORP) of the water and in which acid and halogen are injected by a chemical feed unit; an electronics unit for determining the injection quantity of the acid and/or halogen needed to restore pH and ORP to stored set-points, and for controlling the chemical feed unit in response to the injection time determination; and an optional telecommunication unit for reporting process control status to a remote location and allowing modification of the process parameters, selection of operating modes, and performance of diagnostic tests from the remote location. The service loop is constructed so that the acid injection results in water having a low pH flowing turbulently over the sensors and the halogen injector to keep the sensors and the halogen injector free from scale buildup and to produce data to the electronics unit from which the response characteristics of the sensors can be determined.
REFERENCES:
patent: 4016079 (1977-04-01), Severin
patent: 4224154 (1980-09-01), Steininger
patent: 4550011 (1985-10-01), McCollum
patent: 4648043 (1987-03-01), O'Leary
patent: 4657670 (1987-04-01), Newton
patent: 4688699 (1987-08-01), Goudy, Jr. et al.
Allen Ross R.
McLeod Gary
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