MEASURING OXYGEN CONTENT OF A FLUID

摘要

Apparatus for measuring oxygen content of fluids at elevated temperatures includes a sensor or probe which comprises a Cr2O3 tube and a solid electrolyte button sealing that end of the tube that contacts the fluid. A solid oxygen reference material in the tube made of chromium or a chromium alloy contacts the button and the other end of the tube is sealed with a molybdenum cap. A thermocouple and a lead wire pass through the cap into the tube. A quartz tube surrounds the Cr2O3 tube and button with its outer end in sealing engagement with the button. An electronic conductor has one end extending into the fluid. In one embodiment the conductor is a tube surrounding the quartz tube and in another it is a separate rod or tube. In both embodiments the conductor is preferably a mixture of Al2O3 and molybdenum. The lead wire and the other end of the conductor are connected to a voltage measuring means.