Material interface level sensing

摘要: A system for measuring the level of interface (58) between gasoline and water in an underground storage vessel (10) includes electronics enclosure (22) from which a transmission line probe (24) extends contact with within vessel. The carries reflection target (54) disposed at fixed known position respect to enclosure, normally be covered by gasoline. Electronics (26) employ time-domain reflectometry techniques determine or air/liquid surface (56) gasoline, obtain apparent measurement Since actual distance target, as well bottom vessel, are predetermined known, air/gasoline has been determined, is determinable, compensation factor related dielectric constant can determined. Time-domain employed conjunction this true gasoline/water beneath target.