What is the difference between a chemical (galvanic) oxygen-measuring cell and a zirconium oxide-measuring cell?

The measuring principle of chemical or galvanic oxygen cells is based on a chemical reaction where the measuring cell itself gets consumed. To guarantee reliable and stable oxygen measurements, such cells must be replaced every 6 to 12 months, even when your oxygen of nitrogen generator is not operated (the cell reacts with the oxygen in the ambient air). After such periods the oxygen measurement by chemical or galvanic oxygen cells becomes meaningless, which is very dangerous for critical nitrogen and oxygen applications.

NOVAIR applies as standard zirconium-oxide oxygen measuring cells, which have a stable and reliable oxygen measurement for five years at least and do not get consumed when the generator is not operated.