Measuring system comprising ion-selective electrodes

US4596649A · kind A · utility

Assignee

• Eppendorf Geratebau Netheler & Hinz GmbH · DE

Inventors

• Gerhard Hofmeier · Hamburg, DE
• Wolfgang Tscheu · Henstedt-Ulzburg, DE

Key dates

• Filing date: Mar 15, 1985
• Grant date: Jun 24, 1986
• Expiry date: Mar 15, 2005

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/403
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A measuring system comprises ion-selective electrodes adjoining a measuring passage, which has an inlet and an outlet. The measuring passage has bends, which are adjoined by the sensing electrodes, which are flush with the boundary surface of that measuring passage. Said bends extend also before and behind each electrode. The sensing electrodes are provided at the outside surface of each bend so that they will be effectively rinsed and errors due to entrained impurities will be avoided. The measuring passage is suitably substantially circular but has entrance and exit portions offset from the circular line. The electrodes are provided on the outside particularly in a star-shaped array. The measuring system is provided with a shield consisting of a closed, electrically conducting covering, which preferably consists of a metallic cover. Contact and contact pressure springs are subjected to a uniform stress because the cover is mounted with play by means of a hinge so that self-alignment will be effected.