초록 ▼

An automatic monitor for potable water quality which monitors total dissolved solids (TDS) in drinking water. Built into a faucet base are a pair of indicators in the form of one green and one red LED. A sensor in the form of a pair of spaced electrodes extends into the supply conduit for the faucet

An automatic monitor for potable water quality which monitors total dissolved solids (TDS) in drinking water. Built into a faucet base are a pair of indicators in the form of one green and one red LED. A sensor in the form of a pair of spaced electrodes extends into the supply conduit for the faucet and measures the electrical resistances of the water in the conduit. A pulse power source powered by a battery supplies power to automatically periodically power the sensor and illuminate the green LED as long as the TDS level is below a preselected value. If the level exceeds the preselected value, the red LED is periodically illuminated. The duty cycle for operation and illuminating the LEDs is approximately 0.5% whereby battery drain is sufficiently low that months of continuous monitoring is possible using 4 AA batteries. No ON-OFF switch is needed. If neither LED illuminates once every two minutes, the batteries need replacement.

대표청구항 ▼

An automatic water quality indicating system comprising: sensor means for introduction into a body of water to be measured for total dissolved solids content; said sensor means being responsive to the electrical resistivity of the water in the region of said sensor; resistance means for comparison w

An automatic water quality indicating system comprising: sensor means for introduction into a body of water to be measured for total dissolved solids content; said sensor means being responsive to the electrical resistivity of the water in the region of said sensor; resistance means for comparison with the water electrical resistivity; differential sensing means for determining the greater electrical resistance in said water or said resistance means; voltage responsive indicator means for indicating the greater electrical resistance as determined by said differential sensing means; a pulse power supply for supplying pulses of power to said sensor means, said resistance means, said differential sensing means and said voltage responsive indicator means; battery voltage supply means for continuously supplying operating power to said pulse power supply; whereby the resistivity of the water in the region of said sensor is determined and indicated responsive to pulses of power from said pulse power supply.