Filter life indicator for water purification system using magnet

Details Filter life indicator for water purification system using magnet Filter life indicator for water purification system using magnet

1992-07-07

1993-08-17

Drodge, Joseph W.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

73861, 7386108, 200 819M, 210138, 340609, G01F 160

Patent

active

052365786

ABSTRACT:
A filter life indicator is described herein utilizing a constant flow channel and a flow actuated switch incorporating a reciprocating magnetic member to start a timer. Circuitry monitors this timer and actuates a visual or audible indicator when the filter needs to be replaced. The timer consists of a pulse generator, a scaling circuit, a counter, and a comparator. During flow pulses are counted and compared to a preset limit. And to accommodate filters having differing life expectancy, modules corresponding to each filter are installed to change the scaling circuit.

REFERENCES:
patent: 4522077 (1985-06-01), Koberle
patent: 4623451 (1986-11-01), Oliver
patent: 4808994 (1989-02-01), Riley
patent: 4918426 (1990-04-01), Butts et al.
patent: 5055641 (1991-10-01), Richards
patent: 5089144 (1992-02-01), Ozkahyadglu et al.

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