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Zirconia oxygen analysis |
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Some ceramics conduct electricity
at high temperature through the movement of
charged oxygen ions. Zirconia is such a ceramic.
This ability can be used to measure oxygen
in a gas mixture.
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A zirconia disk is mounted
between the gas to be measured and a reference
gas (usually air), inside a heater. Electrodes
are connected to either side of the disk.
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If there is a difference
in oxygen concentration between the two sides
of the disk, a voltage is generated and detected
by the electrodes.
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In use the Zirconia
disk is mounted on a flexible diaphragm in
a rugged body - making it resistant to both
thermal and mechanical shock.
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Benefits:
- Reliability - unique, symmetrical
design minimises thermal gradients and the sensor mounted
on a flexible diaphragm in a rugged body provides excellent
resistance to vibration and thermal shock.
- Cost saving - direct measurement
of hot flue gases gives reduced sample conditioning
equipment requirement in combustion applications.
- Accuracy and sensitivity - the result
of better performance in terms of linearity, repeatability
and low instrument noise.
- Long operational life - high quality
design and manufacturing processes.
- Very fast response time - unique
design of the body and gas connectors achieves the millisecond
response time required by physiological breath measurement.
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