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The zirconia oxygen analyzer is acceptable for measurements of ppm to % stages of oxygen in a gas or mixture of gases. The zirconia cell is an electrochemical galvanic cell employing a high temperature ceramic sensor made up of stabilised zirconium oxide.

In just an instrument the zirconia cell is mounted in a temperature managed furnace with the necessary electronics to approach the sign from the detection mobile. Ordinarily measurements are displayed immediately by means of a electronic display as oxygen focus about the range .01ppm to 100%.

The concept at the rear of Systech’s zirconia oxygen analyzer

The zirconia cell is a high temperature ceramic sensor. It is an electrochemical galvanic mobile comprising of two electrically conducting, chemically inert, electrodes hooked up to either aspect of a stable electrolyte tube. This is demonstrated schematically in Determine 1 underneath.

The tube is completely gasoline tight and created of a ceramic (stabilised zirconium oxide) which, at the temperature of procedure, conducts electricity by suggests of oxygen ions. (Notice: In sensors of this kind, the temperature has to be above 450°C before they become energetic as an electrolyte conductor). The likely change throughout the cell is presented by the Nernst equation.

The place:

E is the probable change (volts)
R is the gas continuous (8.314 J mol-one K-one)
T is the complete temperature (K)
F is the Faraday frequent (96484 coulomb mol-1)
P1 & P2 are the partial pressures of the oxygen on both aspect of the zirconia tube

The Nernst equation can as a result be reduced to:

Consequently, if the oxygen partial stress at 1 of the electrodes is identified and the temperature of the sensor is managed, then oxygen measurement of the probable change concerning the two electrodes permits the unfamiliar partial stress to be calculated.


The partial force of the gas is equal to the molar concentration of the ingredient in a gasoline mixture situations the full force of the fuel mixture.

PO2 = CO2 P2

exactly where:

PO2 = Oxygen partial force
CO2 = Molar focus of oxygen
P2 = Overall pressure


For atmospheric air:

CO2 = twenty.nine%
P2 = 1 atmosphere

PO2 = (.209/one hundred) x one

PO2 = .209 atmospheres

Theory of Operation
The zirconia mobile applied by Systech Illinois is produced of zirconium oxide stabilised with yttrium oxide as the ceramic with porous platinum electrodes. This mobile is proven in Figure one.

Determine 1: Enlarged cross sectional illustration of the zirconia substrate

Molecular oxygen is ionised at the porous platinum electrodes.

PtO → Pt + ½ O
>½ O2 + 2e- → O2–<
br>The platinum electrodes on each aspect of the cell provide a catalytic surface area for the alter in oxygen molecules, O2, to oxygen ions, and oxygen ions to oxygen molecules. Oxygen molecules on the superior concentration reference gas facet of the mobile gain electrons to grow to be ions which enter the electrolyte. At the same time, at the other electrode, oxygen ions eliminate electrons and are introduced from the floor of the electrode as oxygen molecul

br>The oxygen written content of these gases, and therefore the oxygen partial pressures, is different. Thus, the level at which oxygen ions are made and enter the zirconium oxide electrolyte at every single electrode differs. As the zirconium oxide permits mobility of oxygen ions, the selection of ions shifting in just about every direction across the electrolyte will count on the rate at which oxygen is ionised and enters the electrolyte at every single electrode. The mechanism of this ion transfer is intricate, but it is known to require vacancies in the zirconia oxide lattice by doping with yttrium oxi

br>The result of migration of oxygen ions across the electrolyte is a web circulation of ions in 1 way based upon the partial pressures of oxygen at the two electrodes. For case in point in the Nernst equati

br>If P1>P2 ion stream will be from P1 to P2 i.e. Dew-Point Analyzers a constructive E.M
br>If P1br>If P1=P2 there will be no net ion flow i.e. a zero E.M

br>In the zirconia analyzer, the Nernst equation is writ

br>The zirconia analyzer uses air as a reference, a constant oxygen concentration of 20.9%, and the zirconia cell is mounted inside a furnace whose temperature is controlled to 650°C (923

br>Thus, our Nernst equation further reduces

br>The zirconia analyzer electronically calculates the oxygen partial pressure, and therefore oxygen concentration, of a sample gas with unknown oxygen concentration. This is accomplished by measuring the potential, E, produced across the zirconium cell electrodes, substituting for E in the Nernst equation and anti-logging to obtain PO2. The cell potential output is shown in Figure

br>Figure 2 Graph of cell potential vs. oxygen concentration of zirconia ce

br>By anti-logging the equation, the output signal can be displayed directly on a digital readout meter as oxygen concentration in ppm or

br>As the zirconia instrument uses an absolute measurement principle once built and factory calibrated, it does not require any further factory calibrati

br>Factory calibration consists of calibration of the electronics to accept the millivolt input signal from the detection cell and checking that the instrument then reads correctly on air, 20.9%. The instrument is then further checked for correct reading on ppm oxygen content in nitrog

br>Applications of zirconia oxygen analyz

br>The zirconia analyzers may be used for measurement of oxygen at any level between 0-100% in gases or gas mixtur

br>The only restriction on the instrument’s usage is that the gas to be measured must not contain combustible gases or any material that will poison the zirconium oxide detection ce

br>Any combustible gas, e.g. CO, H2, hydrocarbons such as methane, in the sample gas entering the instrument will combine with any oxygen in the sample gas in the furnace due to the high temperature at which the furnace is kept. This will actually reduce the amount of oxygen in the sample gas and cause the instrument to give an incorrect low readi

br>Materials that will poison the detection cell a

br>Halogens e.g. Chlor
br>Halogenated Hydrocarbons e.g. Methylchlor
br>Sulphur containing compounds e.g. Hydrogen Sulph
br>Lead containing compounds e.g. Lead Sulph
br>Gases or gas mixtures containing any of the above are not suitable for oxygen determination with a zirconia type oxygen analyzer.
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