Water quality monitor

Details Water quality monitor Water quality monitor

G - Physics

01

N

324/45

G01N 27/06 (2006.01) B01D 61/12 (2006.01) G01N 27/10 (2006.01)

Patent

CA 1040710

ABSTRACT OF THE DISCLOSURE An apparatus for monitoring the performance of a reverse osmosis water purification system. The resistivity of the water, and hence its dissolved ionic material concen- tration, is measured at both the inlet and product ports of the system by resistance sensors forming two legs of a wheat- stone bridge. The bridge is powered by two oppositely phased AC signals. The output of the bridge drives a phase sensitive null detector which generates a null error signal. After thresholding, the null error signal actuates a bidirectional meter to indicate the degree of bridge unbalance, as well as to actuate an alarm circuit if the outlet resistance falls below a predetermined value, thereby indicating an unaccept- able degree of purification. The bridge is balanced by a potentiometer forming a pair of bridge legs on each side of the potentiometer wiper. Thus, when the bridge is balanced, the setting of the potenti- ometer wiper corresponds to a given ratio of inlet resistance to outlet resistance. This ratio corresponds to the percentage of ionic material in the product water which has been rejected from the inlet water. The potentiometer dial is calibrated in percent rejection, thereby giving an indication of the per- formance of the reverse osmosic water purification system. Means are also provided for actuating an alarm when the percent rejection falls below a predetermined value and for reading directly the resistivity, and hence ion concentra- tion, of both inlet and product water.

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