APPARATUS FOR MEASURING SULFUR DIOXIDE CONCENTRATIONS

• US 3,622,488 A
• Filed: 09/09/1968
• Issued: 11/23/1971
• Est. Priority Date: 09/09/1968
• Status: Expired due to Term

• Current Assignee: The Whitaker Corporation (Meggitt PLC)
• Original Assignee: Manuel Shaw, Ramesh Chand
• Inventors: Shaw, Manuel, Chand, Ramesh
• Primary Examiner(s): Tung, T.
• Application Number:
  US04/758,527
• Time in Patent Office: 1,170 Days
• Field of Search: 204/1.1,195
• US Class Current: 204/415
• CPC Class Codes: G01N 27/4045 for gases other than oxygen

Abstract

Sulfur dioxide concentrations present in a gaseous mixture are rapidly and continuously monitored by measuring the current passing between an inert metallic sensing electrode and a counter electrode which electrodes are in contact with an aqueous electrolyte solution and at which sensing electrode sulfur dioxide is electrooxidized. The sensing electrode is composed of an inert metal whereas the counter electrode is composed of an electroactive material which is capable of being electrochemically reduced when electrically interconnected with the sensing electrode in the presence of the aqueous electrolyte solution.

Claims

2. The transducer of claim 1 wherein:

the surface of said sensing electrode consists of a material selected from the group consisting of gold, platinum, palladium and iridium.

3. The transducer of claim 1 wherein:

said counterelectrode consists of lead dioxIde.

4. The transducer of claim 1 wherein:

said counterelectrode consists of mercurous sulfate.

5. The transducer of claim 1 wherein:

said electrode consists of silver sulfate.

6. The transducer of claim 1 further comprising:

membrane means for covering said active surface and confining said electrolyte consisting of a membrane material readily permeable to the diffusion of sulfur dioxide therethrough and relatively impermeable to said electrolyte.

7. The transducer of claim 6 wherein:

said membrane material is selected from the group consisting of Teflon and polyethylene.

8. The transducer of claim 6 wherein:

said membrane material is Teflon.