Thermoelectric level detector and a method for its manufacture

US4567762A · kind A · utility

Assignee

• Telefunken Electronic GmbH · DE

Inventors

• Hans Paul Hopper · Aberdeen, GB
• Dieter Busch · Ismaning, DE
• Fritz Sondermann · Willsbach, DE
• Fritz Stork · Zirndorf, DE

Key dates

• Filing date: Feb 19, 1982
• Grant date: Feb 4, 1986
• Expiry date: Feb 19, 2002

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F23/246
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A thermoelectric level detector employs an impedance element, at least a portion of which is meandering in configuration in which the resistive path repeatedly traverses the axis thereof, to detect the level of liquid in a tank. The impedance of the element depends on temperature and provides a measure of the liquid level. The pitch of the meander is relatively small in the reserve region of the tank to provide fine resolution in this region.