Technique for continuously analyzing the concentration of ozone dissolved in water

• US 3,960,673 A
• Filed: 09/27/1974
• Issued: 06/01/1976
• Est. Priority Date: 06/09/1970
• Status: Expired due to Term

• Current Assignee: Fischer & Porter Comapny (ABB Limited)
• Original Assignee: Fischer & Porter Comapny (ABB Limited)
• Inventors: Dailey, Leo L., Morrow, James J.
• Primary Examiner(s): Tung, T.
• Application Number:
  US05/509,829
• Time in Patent Office: 613 Days
• Field of Search: 204/1 T, 204/195 R
• US Class Current: 205/786
• CPC Class Codes: G01N 27/4045 for gases other than oxygen

Abstract

A technique for continuously indicating the concentration of ozone dissolved in water, use being made of an amperometric cell, preferably formed of a gold cathode concentrically disposed within a tubular copper anode to define an annular passage, the cathode being rotated at high speed. A sample stream of the water is directed through the passage at a predetermined flow rate whereby in the absence of dissolved ozone, the cathode is polarized, but in the presence thereof, depolarization takes place to cause a current to flow in the cell, the current being measured to provide a reliable and continuous reading of ozone concentration.

Claims

1. A technique for continuously analyzing the concentration of ozone in an ozone-treated water supply without the use of chemicals, said technique comprising the steps of:

A. conducting a sample of water from said supply at a predetermined flow rate into the annular space which exists in an amperometric cell formed by a cathode disposed within a tubular anode;

B. rotating said cathode at a speed at which polarization and depolarization actions are uniformly distributed on the cathode surface, said cathode being polarized in the absence of ozone in the sample to produce substantially no current flow in said cell and being directly depolarized by ozone to produce a current flow therein which depends on the concentration of ozone;

C. maintaining a potential on said cathode at a level resulting in a proportional relationship between the concentration of ozone and the resultant current flow; and

D. measuring said current flow to indicate the concentration of ozone.

2. A technique as set forth in claim 1, wherein said cathode is made of a noble metal.

3. A technique as set forth in claim 1, further including the steps of sensing the temperature of said water sample and correcting the current flow indication to compensate for the effect of temperature thereon.

4. A technique as set forth in claim 1, wherein said cathode is rotated at a rate greater than 1000 r.p.m.

5. A technique as set forth in claim 1, wherein said cathode is made of platinum and said anode is made of zinc.