System for controlling addition of lime to reduce water alkalini

Details System for controlling addition of lime to reduce water alkalini System for controlling addition of lime to reduce water alkalini

1993-03-31

1994-08-23

Drodge, Joseph W.

Liquid purification or separation

Constituent mixture variation responsive

137 93, 2101981, 210696, 210709, 324439, 364502, B01D 1712

Patent

active

053404688

ABSTRACT:
A system for regulating the addition of lime to reduce water alkalinity includes two sensors for measuring the conductivity of the water prior to and after addition of lime, a pump for adding lime to the water, and a controller for regulating the pump. The controller periodically samples the conductivities measured by both sensors and computes the ratio of the conductivities for each sample as well as the slope of the ratio between samples. The controller turns the pump off when the conductivity ratio exceeds a predetermined maximum set point and the slope is positive, and turns the pump on when the conductivity ratio falls below a predetermined minimum set point and the slope is negative.

REFERENCES:
patent: 4435291 (1984-03-01), Matsko
patent: 5242602 (1993-09-01), Richardson et al.

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