Electrochemical measuring cell

US4029563A · kind A · utility

Assignee

• DRAGERWERK AKTIEGESELLSCHAFT · DE

Inventors

• Horst Binder · Lampertheim, DE
• Reinhard Knodler · Sandhausen, DE
• Alfons Kohling
• Gerd Sandstede

Key dates

• Filing date: Dec 2, 1974
• Grant date: Jun 14, 1977
• Expiry date: Dec 2, 1994

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/4045
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An electrochemical measuring cell for the continuous measurement of sulfur dioxide content of the air in emission and immission areas, comprises a cell housing which has a test gas cell chamber therein for the connection for circulating the gas to be tested into the chamber. The chamber also contains a diffusion electrode which serves as an anode and which is made up of a reversible organic redox system. The cathode comprises an active mass having a redox potential higher than the redox potential of the anode. An immobilized electrolyte is disposed between the anode and the cathode and the anode and cathode are connected to a device for measuring the short circuit current. The diffusion electrode is manufactured from a mixture of chloranil and sodium tungsten bronze which is pulverized in a ball mill for sixteen hours and mixed with a polyethylene powder and sodium sulfate and is then compressed. The cathode is made of a manganese dioxide which is intimately mixed with graphited coal as the conductive additive. The immobilized electrolyte is made of an asbestos fiber and phosphoric acid paste.