Device for the continuous determination of carbon monoxide content of air

US4036724A · kind A · utility

Assignee

• DRAGERWERK AKTIEGESELLSCHAFT · DE

Inventors

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

Key dates

• Filing date: May 23, 1975
• Grant date: Jul 19, 1977
• Expiry date: May 23, 1995

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B3/06
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The device continuously determines the carbon monoxide content of air in the emission and immision range, and comprises an electrochemical cell including an acid electrolyte with a cathode and a diffusion anode in the electrolyte, the anode being depolarizable by carbon monoxide in the acid electrolyte. A current measuring device measures the current between the anodeand the cathode responsive to detection of a gas containing carbon monoxide effective on the diffusion anode. The cathode is made of an unpolarizable material whose oxidation potential is so high that no oxygen reduction takes place at the anode. The cell functions without an external current source, and the current measuring device is connected to directly across the anode and the cathode. The cathode contains substances with an oxidation potential of from 1000 to 1300 millivolts relative to a hydrogen electrode in the same electrolyte. The cathode advantageously contains oxides or mixed oxides of transition metals, or manganates, or cobaltates, a preferred material for the cathode being manganese dioxide (MnO.sub.2).