Patent ID: 7878058
Filing Date: 2011-02-01
Classification: G01F,H02G

Abstract:
1. A liquid monitoring apparatus comprising: a first sensor for detecting a depth of total liquid in an enclosed space; said total liquid comprising at least a first type of liquid; and a second sensor comprises a plurality of parallel metallic plates for detecting the presence of a second type of liquid in the enclosed space and a depth of such second type of liquid up to a threshold depth, wherein the first and second types of liquids make up at least a portion of the depth of total liquid and have different specific gravities, wherein said second sensor is disposed within a barge capable of floating within said first type of liquid but not said second type of liquid, wherein the first sensor is a sonar, pressure, optical or thermal device located above and not in contact with the total liquid and the second sensor contacts either the first type of liquid, the second type of liquid or the total liquid.