Electrochemical measuring cell for determining ammonia or hydrazine in a measuring sample

US5228974A · kind A · utility

Assignee

• DRAGERWERK AKTIEGESELLSCHAFT · DE

Inventors

• Herbert Kiesele · Lübeck, DE
• Uwe Kuhn · Riederich, DE
• Stephan Haupt · Lübeck, DE

Key dates

• Filing date: Dec 11, 1991
• Grant date: Jul 20, 1993
• Expiry date: Dec 11, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02A50/20
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention is directed to an electrochemical measuring cell for measuring ammonia or hydrazine and includes at least a measuring electrode and a counter electrode in an electrolyte. The measuring cell provides a signal increase having a shorter response time and an improved signal stability. For this purpose, the electrolyte is an aqueous solution of a hygroscopic salt of an alkali metal or earth alkali metal such as calcium nitrate or lithium nitrate or a mixture of both salts.