- Specially developed zirconium dioxide probe
- Long service life
- Probes may be replaced without tools and calibration
- Simple installation and maintenance
- Simple calibration
- T.Ü.V. tested
Description and Application:
The OS 2000 sensor does not perform an absolute, but a
comparative measurement.
The flue-gas is in contact with the one side of the cell wall,
the other side of which is in contact with reference air,
with known composition.
For this purpose atmospheric air is used, since this
is always present and contains a knownconcentration
of oxygen (see Illustration I).
The wall of the measure cell consists of zirconiumdioxide,
and is kept on a temperature at around 650 o C by a
heating element.
When the oxygen concentration on the two sides of the
cell wall differs, a migration of oxygen ions occurs through
the cell wall. Hereby the oxygen molecules liberate electrons
when ionized on the one surface of the cell and receive these
again on the other surface forming molecules again.
This results in a weak voltage, which is logarithmically
proportional to the difference in the oxygen concentration
on the two sides of the cell wall.
Illustration I
Specifications:
Illustration II
Insertion length
29 mm (+ length of possible guide pipe)
Working temperature
Flue-gas temperature 0-600 o C Ambient temperature 0 - 60 o C
Time constant: T90 typical 4 seconds maximum 15 seconds
Measuring accuracy
After 1000 hours: at 5% 02 < ± 0.15% 02 at 10% 02 < ± 0.30% 02
Reproducibility
At 2% 02 ± 0,1% 02 Between 4-6% 02 < ± 0.2% 02
Gas-temperature dependence: ± 100 o C => < ± 0,1 % O2 at 10 % O2
Connection: 2 m long teflon cable finished with a multipole connector.
Calibration interval: 6 months (on gas-boilers) otherwise 12 months.
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