US 4,309,262 AGranted

Hydrazine analyzer

AssigneeBeckman Instruments, Inc.

InventorsMelvin Levine, Paul J. Jacobetz, Elmer A. Sperry, III

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Abstract

An improved hydrazine analyzer is disclosed wherein sample and electrolyte solutions are supplied from constant flow rate sources into a mixing chamber where they are premixed. The premixed combination of electrolyte and sample is then passed through a sensing chamber having a sensing thimble disposed therein. The thimble is of a porous material having a platinum wire electrode wound about the outside thereof and having a silver wire inserted into silver chloride salt on the inside thereof to form a reference half cell. As the electrolyte-sample mixture passes through the sensing chamber, a portion of the fluid passes from the outside of the thimble to the inside of the thimble wetting the silver chloride salt to establish electrical contact and provide the internal filling solution of the reference half cell.

Claims2

Dependent claims

Apparatus for measuring the hydrazine content in a system having a source of a sample stream and a source of electrolyte, said apparatus comprising:

mixing means connected to the electrolyte source and the sample stream source for mixing said sample stream and said electrolyte to form a sample mixture;
chamber means for receiving said sample mixture;
porous closed end tube disposed within said chamber means for permitting flow of said sample mixture therethrough;
noble metal electrode configured around said porous closed end tube;
and
dry reference half cell selected from the group consisting of silver-silver oxide and silver-silver chloride disposed within said porous closed end tube to permit saturation of said dry half cell when said sample mixture flows through said porous closed end tube to establish electrical contact between said noble metal electrode and the electrode of said dry reference half cell.

3 more elements

Dependencies are inferred from the claim text.