Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1982-11-08
1986-05-06
Ruehl, Charles A.
Communications: electrical
Condition responsive indicating system
Specific condition
210 85, 210 962, 324441, G08B 2100
Patent
active
045875189
ABSTRACT:
A monitor and control system for water purification apparatus includes first and second conductivity cells located in the input water path and the purified product water path of the apparatus, respectively. The conductivity cells produce output signals exhibiting amplitudes representative of the impurity concentrations in the respective water paths. These signals are detected and modified by circuitry which imposes logarithmic characteristics upon the two signals. The two logarithmically variable signals are differentially combined to produce a signal for display which is representative of the percent of impurity rejection of the water purification apparatus. The detected signal are also individually combined with signals representative of the temperature of the water being processed. The temperature-corrected signals are then displayed to provide an indication of the impurity concentrations of the input and purified water paths in parts per million. Treated water which exceeds desired limits of percent impurity rejection or impurity concentration is detected to cause the generation of an alarm signal. The alarm signal indicates that the apparatus is producing treated water which does not meet the desired criteria of water purity.
REFERENCES:
patent: 3029379 (1962-04-01), Ingram
patent: 3131346 (1964-04-01), Parke
patent: 3255417 (1966-06-01), Gottlieb
patent: 3990066 (1976-11-01), Malmgren
patent: 4333023 (1982-06-01), Hood, Jr.
Baxter Travenol Laboratories Inc.
Flattery Paul C.
Myer Daniel
Pierce Kay H.
Ruehl Charles A.
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