Electrochemical NO/sub x/ sensor

Patent · Tue Sep 13 04:00:00 EDT 1988

OSTI ID:6656294

Noda, M; Kato, N; Kurachi, H

An NO/sub x/ sensor is described for determining the concentration of nitrogen oxides contained in a measurement gas in an external measurement-gas space, comprising: a first electrochemical oxygen partial pressure detecting element including (a) a first electrochemical oxygen pumping cell having an oxygen-ion conductive solid electrolyte body, and a pair of electrodes, (b) a first electrochemical oxygen sensing cell having an oxygen-ion conductive solid electrolyte body, and a pair of electrodes, (c) first diffusion-resistance means for introducing the measurement gas from the external measurement-gas space; a second electrochemical oxygen partial pressure detecting element including (i) a second electrochemical oxygen pumping cell having an oxygen-ion conductive solid electrolyte body, and a pair of electrodes, (ii) a second electrochemical oxygen sensing cell having an oxygen-ion conductive solid electrolyte body, and a pair of electrodes, (iii) second diffusion-resistance means for introducing the measurement gas from the external measurement-gas space, with a second predetermined diffusion resistance substantially equal to the first predetermined diffusion resistance, so that one of the pair of electrodes of the second oxygen pumping cell, and one of the pair of electrodes of the second oxygen sensing cell, are exposed to the introduced measurement gas, and (iv) second reference-gas inlet means for exposing the other of the pair of electrodes of the second oxygen sensing cell to a reference atmosphere substantially the same as the reference gas; at least one catalytic electrode which consists of at least one of the one electrode of the second oxygen pumping cell and the one electrode of the second oxygen sensing cell.

• Assignee: NGK Insulators, Ltd., Aichi
• Patent Number(s): US 4770760
• OSTI ID: 6656294
• Country of Publication: United States
• Language: English

Related Subjects

440300* -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION MONITORING
AIR POLLUTION MONITORS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMISTRY
DESIGN
ELECTROCHEMISTRY
ELECTRODES
ELECTROLYTES
GASEOUS WASTES
MEASURING INSTRUMENTS
METERING
MONITORS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
SOLID ELECTROLYTES
WASTES