Cosa 9610, Инструкция по установке, эксплуатации и обслуживанию

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INSTALLATION, OPERATION AND MAINTENANCE MANUAL – COSA 9610™
Page 6 of 48
1.2.1. Oven with oxygen sensor
The gas/air mixture is burnt catalytically in an oven, which is kept at 812ºC with a heating
spiral. The temperature is maintained with temperature control using a K-type
thermocouple. The oxygen sensor in the oven is a zirconium oxide cell. This is mounted
such, that one side is in contact with the outside air and the other side with the flue
gasses. At high temperatures, (600ºC) O
2
-ions in the ZrO
2
grating become mobile through
vacancies therein. By fixing porous Pt-electrodes at both sides of the ZrO
2
, O
2,
gas
molecules can, through diffusion by and uptake of two electrons from the Pt electrode,
enter the ZrO
2
as O
2
-ion, move to the other electrodes and be converted in gaseous O
2
again by release of the two electrons.
Oven
Vent
Inlet
Air/Gas
Mixture
Heating Spiral
Oxygen Sensor
Drain