G - Physics – 01 – N
Patent
G - Physics
01
N
324/23
G01N 27/30 (2006.01) G01N 27/28 (2006.01) G01N 27/36 (2006.01) G01N 27/38 (2006.01) G01N 27/401 (2006.01)
Patent
CA 1286720
ABSTRACT A test electrode for immersion in a sample solution having a selectively openable liquid junction is disclosed. The electrode includes an electrode tube with a bottom opening. The bottom opening is defined by a curved inside wall at the end of the electrode tube. A connecting rod extends axially through the electrode tube. A bulbous stopper is located at the end of the connecting rod outside of the bottom opening. The connecting rod is attached to a cap located over the top of the electrode tube. A biasing spring located inside the cap around the connecting rod between the top of the electrode tube and the base of the cap provides a selective force on the cap and connecting rod so the stopper normally abuts the electrode bottom opening. A thin annular liquid junction forms before the area of contact between the stopper and the inside wall of the electrode. Electrolyte inside the electrode can be flushed by depressing -the cap so the stopper is urged away from the electrode bottom opening so the liquid junction is opened. The flow of flushed electrolyte over the stopper and the electrode end inside wall cleans the surfaces that form the liquid junction. The connecting rod can be a hollow tube and the stopper can be supplied with an ion sensitive tip so the electrode of this invention can be a combination electrode, the outer electrode with the liquid junction being the reference electrode, and the connecting rod and stopper with an ion sensitive tip being the measuring electrode.
545266
Orion Research Incorporated
Smart & Biggar
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