Automatic chlorine and pH control apparatus for swimming pools

Liquid purification or separation – Constituent mixture variation responsive – With membrane

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Details

73421B, 137 93, 210139, 210142, 210169, 356181, E04H 320

Patent

active

040160793

ABSTRACT:
Control apparatus for swimming pools to automatically regulate chlorinator and acidifier operation, thereby maintaining a desired chlorine residual and pH level. A first liquid sample from a swimming pool along with a chlorine reagent substance and a second liquid sample from the pool along with a pH reagent are sequentially introduced into a sample cell with a light source projecting light through the sample cell onto first and second photoelectric cells. The first photocell produces a signal having a magnitude that is directly proportional to the chlorine residual in the first liquid sample, and the second photocell produces a signal functionally related to the pH level of the second liquid sample. First and second comparators connected to the first and second photoelectric cells detect whether the chlorine residual or the pH level of the pool water is above or below a prescribed value and supply a two-state output signal which represents the existence or non-existence of the prescribed level of chlorine residual or pH in the liquid samples. Flip-flops store the detection results and supply signals to driver circuits which initiate or inhibit chlorinator and acidifier operation. A timing circuit periodically enables system operation with a state controller sequencing system operation.

REFERENCES:
patent: 1960615 (1934-05-01), Baker
patent: 2063140 (1936-12-01), Allison
patent: 2526515 (1950-10-01), Stein
patent: 3012156 (1961-12-01), Simmons
patent: 3351542 (1967-11-01), Oldershaw et al.
patent: 3401591 (1968-09-01), Anthon
patent: 3464555 (1969-09-01), Schneider
patent: 3574553 (1971-04-01), Weitz et al.
patent: 3804253 (1974-04-01), Wellman et al.
patent: 3897798 (1975-08-01), De Vale

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