Combustibles sensor

Details Combustibles sensor Combustibles sensor

G - Physics

01

N

324/25

G01N 27/16 (2006.01) B01L 99/00 (2010.01) G01N 1/22 (2006.01) G01N 27/07 (2006.01)

Patent

CA 1170720

- 8 - Case No. 4330 ABSTRACT OF THE DISCLOSURE A modified zirconia oxygen sensor is disclosed wherein gas flows through inner (14) and outer tubes (12) and wherein one electrode (18) is attached to the inner surface of the inner tube (14), and the second electrode (16) is attached to the outer surface of the inner tube (14), The outer catalytic surface of inner tube (14) is made inert so that an oxygen potential difference is produced between the electrodes (16, 18) which results in a voltage output, as read by the oxygen analyzer (42), which 18 proportional to the initial level of the combustible in the gas. The utilization of inner (}4) and outer tubes (12) wherein the portion of the gas sample contacting the active electrode (18) is maintained separate from the portion of the gas sample contacting the inactive electrode (16 prevents back or edge diffusion between the electrodes.

397311

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