Electrochemical measuring cell having an ancillary electrode

• US 4,681,115 A
• Filed: 05/22/1986
• Issued: 07/21/1987
• Est. Priority Date: 09/07/1984
• Status: Expired due to Fees

• Current Assignee: Dragerwerk AG
• Original Assignee: Dragerwerk AG
• Inventors: Holscher, Uvo
• Primary Examiner(s): Tung, T.
• Application Number:
  US06/866,578
• Time in Patent Office: 425 Days
• Field of Search: 204/403, 204/412, 204/415, 204/1 P, 128/635, 128/639, 128/644, 128/670
• US Class Current: 600/397
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/1477 non-invasive
• CPC Class Codes: G01N 27/404 Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid , e.g. Clark-type oxygen sensors

Abstract

An electrochemical measuring cell is disclosed having a device for sensing an external electical potential. The device is arranged in the region of the outer surface of the diffusion membrane of the cell. The device can be, for example, in the form of a conductive, gas-permeable coating applied to the outer surface of the diffusion membrane.

Claims

1. An electrochemical measuring cell comprising:

an electrolyte;

a measuring electrode disposed in said electrolyte;

a counter electrode also disposed in said electrolyte;

a housing for holding said electrolyte;

a diffusion membrane for separating said electrolyte from the ambient and having a smooth outer surface facing away from said electrolyte; and

,

an electrically-conductive, gas-permeable coating of silver applied to said outer surface for sensing an external electrical potential.

2. The electrochemical measuring cell of claim 1 comprising electric circuit means mounted on said housing for conducting said external potential away from said coating and making the same accessible for measurement.

3. An electrochemical measuring cell comprising:

an electrolyte;

a measuring electrode disposed in said electrolyte;

a counter electrode also disposed in said electrolyte;

a housing for holding said electrolyte;

a diffusion membrane for separating said electrolyte from the ambient and having a smooth outer surface facing away from said electrolyte; and

,

an electrically-conductive, gas-permeable cotating made of a halogenated compound of silver applied to said smooth outer surface.

4. The electrochemical measuring cell of claim 3, wherein the halogen of said halogenated compound of silver is selected from the group consisting of chlorine, bromine and iodine.

5. The electrochemical measuring cell of claim 3, said coating consisting of chlorinated silver.

6. The electrochemical measuring cell of claim 3 comprising electric circuit means mounted on said housing for conducting said external potential away from said coating and making the same accessible for measurement.