Liquid purification or separation – With alarm – indicator – register – recorder – signal or...
Patent
1991-10-02
1992-09-08
Dawson, Robert A.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
210 94, 210 961, 324446, 340603, 3408151, B01D 35143, G01N 2706
Patent
active
051455757
ABSTRACT:
A water quality monitor is provided for use in a purified water supply system of the type having a reverse osmosis unit for producing relatively purified water from an ordinary tap water supply. The monitor includes a control circuit having electrodes in contact with the purified and tap water supplies. The control circuit is activated by depression of a test button, preferably in response to opening of a faucet valve to dispense water, 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, and maintains an 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 minimizing electrode corrosion and/or accumulation of ionic deposits. The generation of a short duration 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 service life when a battery power source is used.
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Dawson Robert A.
Drodge Joseph
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