Patent ID: 6928862
Filing Date: 2005-08-16
Classification: G01F,G01N

Abstract:
1. A method of monitoring dual-phase liquid and interface levels comprising the following steps: a) removably suspending a monitoring instrument in a site to be monitored, b) providing a level element that floats on an upper surface of a product layer of liquid in said site, c) providing a first pressure transducer that is connected to said level element at a fixed distance below said level element, said distance being such that said first pressure transducer is suspended in a heavier one of the two liquids being monitored, d) continuously monitoring output signals from said first pressure transducer indicating measured fluid pressure, e) continuously monitoring output signals from said level element indicating measured fluid pressure, and f) comparing said output signals of said first pressure transducer and said level element to a reference pressure to calculate a level of a groundwater and product interface and a thickness of said product layer.