Importance

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Abstract

A water quality monitor is provided for use in a purified water supply system of the type having a reverse osmosis unit or the like for producing relatively purified water from an ordinary tap or feed water supply. The monitor includes a control circuit having eletrodes in contact with the purified and tap water supplies. The control circuit is activated by depression of a test button to produce a short duration pulse of one polarity which is connected to the electrodes for use in determining the water conductivities. The control circuit compares the conductivities of the purified and tap water supplies, wherein this comparison represents the operational efficiency of the purification system in removing contaminants from the incoming tap water. The control circuit responds to this comparison to illuminate an appropriate indicator light or the like and thereby indicate the operational state of the purification system. The control circuit maintains the appropriate indicator light in an illuminated state until the test button is released, at which time the control circuit couples a short duration pulse of opposite polarity to the electrodes for preventing or minimizing electrode corrosion and/or accumulation of ionic deposit thereon. The generation of a short duraction pulse to determine conductivity. In combination with illumination of the appropriate indicator light only until the test button is released, minimizes circuit power consumption and thereby extends monitor service life when a battery power source is used.

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First Claim