GREEN INSTRUMENTS G36p - Figure 1-1: Simplified Schematic of the Zirconia Cell

G36p Oxygen Analyzer
Version 2.11 – Revision March 2022 7
The most important element of
the sensor is the zirconia cell.
At high temperatures, the oxy-
gen ions can diffuse through
the zirconium dioxide mem-
brane. When the membrane is
exposed to environment that
contains different amounts of
oxygen (e.g. the sensor inter-
nal reference gas on one side
and sample gas on the other),
nature seeks to balance itself,
and the transportation of ions
through the membrane will
generate an electrical charge.
Sample Gas
Ambient Air
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 G36p Oxygen Analyzer has CE and MED markings as well as DNV, Bureau Veritas
and Lloyd's Register Type Approvals.
Download all product certificates at https://greeninstruments.com/