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Water quality monitor for a water purification system

  • US 5,145,575 A
  • Filed: 10/02/1991
  • Issued: 09/08/1992
  • Est. Priority Date: 03/09/1990
  • Status: Expired due to Term
First Claim
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1. A water quality monitor adapted for use in a water purification system adapted to produce a relatively purified water supply from a tap water supply, said water quality monitor comprising:

  • electrode means for contacting the tap water supply and the relatively purified water supply produced from the tap water supply by a purification system and obtaining respective conductivities of said supplies;

    circuit means having a switch movable between first and second positions and including means activated upon movement of said switch to said first position for generating a short duration pulse of one polarity and for connecting said pulse to said electrode means, said circuit means further including means for determining relative ratios of the conductivities of the tap and purified water supplies and for comparing said ratios with a selected threshold representing satisfactory operating performance of the purification system and for generating one of first and second outputs respectively representing satisfactory and unsatisfactory system performance;

    indicator means responsive to said one of said first and second outputs to indicate system performance;

    said circuit means further including means for maintaining said indicator means in an operative state to indicate system performance while said switch is in said first position, and for a duration independent of and potentially longer than the duration of said pulse; and

    faucet valve means for dispensing purified water from the purification system, said faucet valve means including means for moving said switch between said first and second positions.

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