Compensating force-measuring or weighing device

US4091886A · kind A · utility

Assignee

• Sartorius-Werke GmbH · DE

Inventors

• Erich Knothe · Bovenden, DE
• Christoph Berg · Oettingen, DE
• Eberhard Stadler · Göttingen, DE

Key dates

• Filing date: Jan 26, 1977
• Grant date: May 30, 1978
• Expiry date: Jan 26, 1997

Classification

• Technology area (CPC G): Physics
• CPC primary: G01G7/04
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An electromagnetic, compensating force-measuring or weighing device having at least one working coil movable in an air gap of a magnet system. At least two members for temperature compensation are positioned at different, spaced apart points. The compensating effect of these members on the active part of the system jointly produce a temperature compensating value which is optionally approximately equal to the exact value of the actual temperature curve. The members may be in the form of a plurality of minute particles of nonretentive material having a high negative coefficient of saturation magnetization distributed in the active part. The members may be formed of the afore-mentioned material and be positioned on the active part or be PTC or NTC resistors so positioned.