US 4,394,240 AGranted

Combined sulfur oxide/oxygen measuring apparatus

AssigneeWestinghouse Electric Corp.

InventorAlfred R. Pebler

Life of this patent

Estimating the term…

Abstract

Oxygen ion and oxy-anion conductive solid electrolyte, electrochemical cells are combined to form a single gas measuring apparatus having a common internal gas reference and developing electrical signals from which the partial pressure of oxygen and an anhydride of a monitored gas environment can be determined.

Claims4

Dependent claims

A multi-sensor gas measuring apparatus for generating signals indicative of the partial pressure of oxygen and the partial pressure of a selected anhydride, i.e., SO.sub.X, NO.sub.X, etc. of a monitored gas environment comprising,

first and second solid electrolyte electrochemical cells each cell including an oxygen ion conductive solid electrolyte element having a sensing electrode and a reference electrode disposed on opposite surfaces thereof,
a third solid electrolyte electrochemical cell including a solid electrolyte element containing oxy-anions of the selected anhydride having a sensing electrode and a reference electrode disposed on opposite surfaces thereof, said first, second and third solid electrolyte electrochemical cells being combined to form an enclosure having a cavity therein,
a reference composition of said selected anhydride and oxygen being located within said cavity, said reference electrodes of said first, second and third solid electrolyte electrochemical cells being exposed to said reference composition,
said sensing electrode of said first solid electrolyte electrochemical cell being exposed to a gas environment of known oxygen partial pressure, said first cell generating a signal indicative of the oxygen partial pressure of the reference composition,
said sensing electrodes of said second and third cells being exposed to said monitored gas environment, said second cell generating a signal indicative of the difference in oxygen partial pressure between the monitored gas environment and the reference composition, said third cell generating a signal indicative of the difference between the partial pressure of the combination of oxygen and the selected anhydride in the monitored gas environment and the partial pressure of the combination of oxygen and the selected anhydride in the reference composition, and
circuit means connected to said first, second and third cells and responding to the signals generated by providing an indication of both the partial pressure of oxygen and the partial pressure of the selected anhydride within said monitored gas environment.

3 more elements

Dependencies are inferred from the claim text.

patentgrep

Loading patent…

Abstract

first and second solid electrolyte electrochemical cells each cell including an oxygen ion conductive solid electrolyte element having a sensing electrode and a reference electrode disposed on opposite surfaces thereof,
a third solid electrolyte electrochemical cell including a solid electrolyte element containing oxy-anions of the selected anhydride having a sensing electrode and a reference electrode disposed on opposite surfaces thereof, said first, second and third solid electrolyte electrochemical cells being combined to form an enclosure having a cavity therein,
a reference composition of said selected anhydride and oxygen being located within said cavity, said reference electrodes of said first, second and third solid electrolyte electrochemical cells being exposed to said reference composition,
said sensing electrode of said first solid electrolyte electrochemical cell being exposed to a gas environment of known oxygen partial pressure, said first cell generating a signal indicative of the oxygen partial pressure of the reference composition,
said sensing electrodes of said second and third cells being exposed to said monitored gas environment, said second cell generating a signal indicative of the difference in oxygen partial pressure between the monitored gas environment and the reference composition, said third cell generating a signal indicative of the difference between the partial pressure of the combination of oxygen and the selected anhydride in the monitored gas environment and the partial pressure of the combination of oxygen and the selected anhydride in the reference composition, and
circuit means connected to said first, second and third cells and responding to the signals generated by providing an indication of both the partial pressure of oxygen and the partial pressure of the selected anhydride within said monitored gas environment.

3 more elements