Antimony electrode assembly and method of manufacture, and use thereof

• US 4,681,116 A
• Filed: 11/12/1985
• Issued: 07/21/1987
• Est. Priority Date: 11/12/1984
• Status: Expired due to Fees

• Current Assignee: Chemfet Canada Limited
• Original Assignee: Chemfet Canada Limited
• Inventors: Settler, Bert
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US06/796,704
• Time in Patent Office: 616 Days
• Field of Search: 128/635, 204/403, 204/433, 204/435
• US Class Current: 600/349
• CPC Class Codes: G01N 27/302 pH sensitive, e.g. quinhydron, antimony or hydrogen electrodes ion selective electrodes G01N27/333, glass electrodes G01N27/36

Abstract

An antimony electrode for pH measurement is formed with a convex, very smooth tip and sealed within a flexible plastic sheath with just the tip exposed. A reference electrode is provided either separately or in conjunction with the antimony electrode, the reference electrode being sealed within a plastic tube surrounded by an electrolyte. One end of the reference electrode is operatively connected through one end of the tube, to a conductor cable. The other end of the reference electrode terminates spaced internally from the other end of the tube and a plug closes this other end. This plug is formed from a material such as wood, which is saturated with electrolyte that forms an electrolytic connection between the exposed end of the plug of the electrolyte within the tube and hence with the reference electrode in the tube.

Claims

1. An antimony electrode for pH measurement comprising in combination a relatively short length of antimony rod having an inner end and an outer or distal end secured by the inner end thereof, as by soldering to one end of a flexible conducting wire, the distal end of said rod being convex and substantially hemispherical and having a highly polished surface approaching a single, one plane crystal face, a relatively hard epoxy resin covering at least part of the length of said rod but with the distal end remaining exposed, a flexible plastic tube surrounding said rod the junction of said rod with said conducting wire and at least part of said conducting wire, with said distal end of said rod remaining exposed and a sealant between said portion of said plastic tube adjacent said distal end of said rod and said distal end of said rod thereby providing a sealing relationship of said plastic tube around said rod to prevent ingress of contaminants.

2. A pH sensor assembly comprising in combination an antimony electrode, said antimony electrode including a relatively short length of antimony rod having an inner end and an outer or distal end, secured by the inner end thereof, as by soldering, to one end of a flexible conducting wire, the distal end of said rod being convex and substantially hemispherical and having a highly polished surface approaching a single, one plane crystal face, a relatively hard epoxy resin covering at least part of the length of said rod but with the distal end remaining exposed, a flexible plastic tube surrounding said rod, the junction of said rod with said conducting wire, and at least part of said conducting wire, with said distal end of said rod remaining exposed, and a sealant between said portion of said plastic tube adjacent said distal end of said rod and said distal end of said rod thereby providing a sealing relationship of said plastic tube around said rod to prevent a length of electrode assembly holding tubing, means mounting the distal end portion of said antimony electrode in one end of said tubing with the distal convex end of said rod exposed, the other end of said antimony electrode operatively extending in sealing relationship through the other end of said tubing, a reference electrode within said tubing, one end of said reference electrode assembly also operatively extending in sealing relationship, through said other end of said tubing and a gel type electrolyte within said tubing and surrounding the portion of at least said reference electrode therewithin, said means mounting the distal end portion of said antimony electrode in one end of said tubing including a liquid-electrolyte-permeated portion extending therethrough and being in electrolytical connection with the electrolyte within said tubing.

3. The combination according to claim 2 in which said electrolyte within said electrode assembly holding tubing comprises a gel consisting of a chloride selected from the group consisting of potassium chloride and sodium chloride.

4. The combination according to claim 3 usable as an esophageal electrode assembly and which includes a conducting wire operatively secured to one end of said reference electrode, said conducting wire of said reference electrode and said conducting wire of said pH antimony electrode extending in sealed relationship from said other end of said electrode assembly holding tubing, a length of intramedic plastic tubing enclosing said conducting wires and being sealed to said other end of said electrode assembly holding tubing, and connecting plug means operatively connected to the other ends of said conducting wires.

5. The combination according to claim 2 usable as an esophageal electrode assembly and which includes a conducting wire operatively secured to one end of said reference electrode, said conducting wire of said reference electrode and said conducting wire of said pH antimony electrode extending in sealed relationship from said other end of said electrode assembly holding tubing, a length of intramedic plastic tubing enclosing said conducting wires and being sealed to said other end of said electrode assembly holding tubing, and connecting plug means operatively connected to the other ends of said conducting wires.