Liquid purification or separation – With alarm – indicator – register – recorder – signal or...
Patent
1978-12-20
1980-09-23
Therkorn, Ernest G.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
210 961, 210139, 210142, 210143, 210169, 137 93, C02B 308, G05D 1108
Patent
active
042241545
ABSTRACT:
The disclosed system for controlling the chemical balance of a body of liquid, such as a swimming pool, compares the output of a chemical balance sensor immersed in the liquid with a standard indicative of the desired chemical balance, then dispenses a chemical into the pool to adjust its balance towards the desired balance. A timer limits the duty cycle of the dispenser to a relatively short dispensing interval followed by a longer non-dispensing interval permitting the dispensed chemical to disperse throughout the pool, the sensing and dispensing cycle then being repeated if appropriate. Preferably, there are a plurality of sensors, comparators and dispensers, each dispenser having a timer to limit its duty cycle. Also, preferably an over-range alarm is employed to alert an attendant when the chemical balance of the pool departs from a given range. Further, preferably the system is adjustable permitting both the desired balance level and the water limits defining the given range to be simultaneously adjusted. The system may be employed with either a dry or liquid chemical dispenser.
REFERENCES:
patent: 3195551 (1965-07-01), Russel
patent: 3376883 (1968-04-01), Douty
patent: 3528545 (1970-09-01), Frazel et al.
patent: 3554212 (1971-01-01), Maroney
patent: 3648080 (1972-03-01), Nakaya
patent: 3660681 (1972-05-01), Vlaeminck
patent: 3682131 (1972-08-01), Algeri
patent: 3697879 (1972-10-01), Holliday
patent: 4016079 (1977-04-01), Severin
patent: 4033871 (1977-07-01), Wall
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