Patent Number: 061817600
Section: claims

1. A sensor electrode for use in measuring an electrochemical corrosion potential comprising: a sensor tip;  a conductor electrically connected to the sensor tip;  an insulating member which surrounds the conductor;  a connecting member which surrounds the conductor; and  a sleeve which fits over the sensor tip, the insulating member, and the connecting member, the sleeve having inner threads which engage with corresponding outer threads on at least one of the sensor tip and the connecting member.  a sensor tip electrically connected to a conductor;  a insulating member comprising sapphire which surrounds the conductor;  a connecting member which surrounds the conductor;  a sleeve which fits over at least a portion of the sensor tip, the insulating member, the sleeve having inner threads which engage with corresponding outer threads on at least on at least one of the sensor tip and the connecting member and at least a portion of the connecting member, wherein the sleeve is preformed to have a density which is at least 97.5% of theoretical density. 2. The sensor electrode of claim 1, wherein the insulating member comprises sapphire. 3. The sensor electrode of claim 1, wherein the connecting member comprises alloy 42. 4. The sensor electrode of claim 1, further comprising a braze joint between the insulating member and at least one of the connecting member and the sensor tip. 5. The sensor electrode of claim 1, wherein the sensor tip comprises platinum. 6. The sensor electrode of claim 1, wherein the sleeve comprises at least one of magnesia stabilized zirconia, yttria stabilized zirconia, and zircaloy. 7. The sensor electrode of claim 1, wherein the sleeve has a density which is greater than 97.5% of theoretical density. 8. The sensor electrode of claim 1, wherein the sleeve has a density which is greater than 99% of theoretical density. 9. A sensor electrode for use in measuring an electrochemical corrosion potential comprising: 10. The sensor electrode of claim 9, wherein the sleeve comprises zircaloy. 11. The sensor electrode of claim 9, wherein the insulating member is sealed to at least one of the sensor tip and the connecting member, the seal comprising a ceramic powder sprayed onto the insulating member and at least one of the sensor tip and the connecting member. 12. The sensor electrode of claim 11, further comprising a bond coat beneath the ceramic powder. 13. The sensor electrode of claim 12, wherein the bond coat comprises M-Chromium-Alumina-Yttrium alloy, where M=NiCoFe or Ni+Co. 14. The sensor electrode of claim 9, wherein the connecting member comprises alloy 42. 15. The sensor electrode of claim 9, further comprising a braze joint between the insulating member and at least one of the connecting member and the sensor tip. 16. The sensor electrode of claim 9, wherein the sensor tip comprises platinum. 17. The sensor electrode of claim 9, wherein the sleeve comprises at least one of magnesia stabilized zirconia, yttria stabilized zirconia, and zircaloy. 18. The sensor electrode of claim 9, wherein the sleeve has a density which is greater than 99% of theoretical density. 19. The sensor electrode of claim 9, wherein the sleeve is formed by sintering a ceramic powder. 20. The sensor electrode of claim 19, wherein the ceramic powder comprises at least one of magnesia stabilized zirconia and yttria stabilized zirconia.