GREEN INSTRUMENTS G36 - Figure 1-1: Simplified Schematic of the Zirconia Cell

G36 Oxygen Analyzer
Version 2.11 - March 2022 7
The most important element
of the sensor is the zirconia
cell. At high temperatures,
the oxygen ions can diffuse
through the zirconium diox-
ide membrane. When the
membrane is exposed to an
environment that contains
different amounts of oxygen
(e.g. the sensor internal refer-
ence gas on one side and
sample gas on the other), na-
ture seeks to balance itself,
and the transportation of ions
through the membrane will
generate an electrical charge.
Sample Gas
Reference Gas
Zirconium Dioxide Membrane
O
2–
O
2–
ZrO
2
O
2
O
2
O
2
O
2
O
2
O
2
O
2
O
2
O
2
V
e
–
e
–
Figure 1-1: Simplified schematic of the zirconia cell
This charge depends on the amount of the passing oxygen ions i.e. the difference between
the oxygen levels in the sample gas and the reference gas. This voltage will be detected
and converted into a signal that is proportional to the oxygen concentration in the sample
gas. The signal will be processed in the analyzer and the oxygen concentration of the
sample gas will be shown in the display.
The G
36
Oxygen Analyzer has CE and MED markings as well as DNV, Bureau Veritas,
and Lloyds Register Type Approvals.
Download all product certificates at https://greeninstruments.com/