Gaseous carbon dioxide detection sensor

• US 5,194,134 A
• Filed: 08/08/1991
• Issued: 03/16/1993
• Est. Priority Date: 08/09/1990
• Status: Expired due to Term

• Current Assignee: Yazaki Corporation
• Original Assignee: Yazaki Corporation
• Inventors: Hadano, Hironori, Suzuki, Takayuki, Miura, Norio, Yamazoe, Noboru, Futata, Hozumi, Takashima, Hiromasa
• Primary Examiner(s): Niebling, John
• Assistant Examiner(s): Bell, Bruce F.
• Application Number:
  US07/741,907
• Time in Patent Office: 586 Days
• Field of Search: 204/416, 204/419, 204/421, 204/424, 204/426, 204/427, 204/431, 204/432
• US Class Current: 204/421
• CPC Class Codes: G01N 27/4074 for detection of gases other than oxygen
• CPC Class Codes: G01N 33/004 for CO, CO2

Abstract

A gaseous carbon dioxide detection sensor comprising a detection electrode and a reference electrode opposed on both sides of an ionic conductor, wherein a mixture comprising one mol of an alkali metal carbonate more than one mol of an alkaline earth metal carbonate is used as the detection material for the detection electrode. The detection sensor has the electromotive force characteristic relative to the gaseous carbon dioxide less undergoing the effect of moisture in the gas to be measured and has a high sensitivity.

Claims

1. A gaseous carbon dioxide detection sensor comprising a solid ionic conductor having two sides, a detection electrode and a reference electrode positioned on opposite sides of said solid ionic conductor, said detection electrode comprising detection material, said detection material comprising an amount of alkali metal carbonate, and an amount of alkaline earth metal carbonate which is greater than said amount of alkali metal carbonate and which is effective to provide detection material which is effective in said detection electrode to provide a gaseous carbon dioxide detection sensor.

2. A gaseous carbon dioxide detection sensor as defined in claim 1, wherein the detection material is a solid solution comprising the alkali metal carbonate and the alkaline earth metal carbonate and does not contains crystals of the alkali metal carbonate.

3. A gaseous carbon dioxide detection sensor as defined in claim 1, wherein the alkali metal carbonate is at least one of lithium, sodium or potassium carbonates.

4. A gaseous carbon dioxide detection sensor as defined in claim 1, wherein the alkaline earth metal carbonate is at least one of calcium, strontium or barium carbonates.