Patent ID: 6481278
Filing Date: 2002-11-19
Classification: G01F,H01H

Abstract:
In a liquid level measuring apparatus having a plurality of spaced-apart Hall-effect switches vertically arranged for positioning in a liquid for sequential actuation by a floating magnet, with electronic means for indicating liquid level based on switch actuation by the magnet, the improvement comprising:a) a plurality of Hall-effect switches, each switch having a single magnetic sensor, a maximum vertical dimension A, and a maximum horizontal dimension B; b) each switch having a center point positioned vertically by a first distance less than A from the center points of the immediately adjacent upper and lower switches; c) each switch having a center point positioned horizontally by a second distance at least as great as B from the center points of the immediately adjacent upper and lower switches; and d) a permanent magnet constructed to float in the liquid to be measured and to actuate the switches uniformly in turn as the liquid level rises.