The FluegasExact 2700 analyzer for effective combustion analysis

Zirconia provides trusted and accurate oxygen measurement

Zirconia is a reliable oxygen sensing technology capable of providing measurements at parts-per-million (ppm) and percentage levels. Trusted by industries around the world, it is an essential component of our SERVOTOUGH FluegasExact 2700 analyzer, which monitors O2 levels in in-situ combustion processes.

The Servomex Zirconia sensor consists of a cell made of ceramic zirconium oxide, stabilized with an oxide of yttrium to form a lattice structure.

The measure and reference sections of the cell are covered with catalytic, porous, electrically conductive coatings that serve as electrodes on both sides of the lattice barrier between sample and reference gas volumes.

At elevated temperatures, the lattice permits the passage of negatively charged oxygen ions, formed at the catalytic electrodes at a rate determined by temperature and the difference in the O2 partial pressures of the sample gas and the reference gas.

The passage of the ions produces a voltage across the electrodes – the magnitude of this is a logarithmic function of the ratio of the O2 partial pressures of the sample and reference gases.

Since the partial pressure of the reference gas is predetermined, the voltage produced by the cell indicates the O2 content of the sample gas.

There are two variants of our sensor: a higher-temperature variant for percentage O2 in flue gas, and a lower-temperature variant with modified catalytic electrode properties for parts-per-million (ppm) O2 measurements in purity applications.

Related and alternative technologies

Our Zirconia sensor is paired with Calorimetry sensing to deliver an all-in-one combustion control solution. In some applications, Measurement errors may result if the sample contains hydrocarbons. Depending on the application, a Paramagnetic or TDL sensor may be recommended for the oxygen measurement instead.

Key applications

Process heaters

Thermal crackers


Nitrogen purity

Utility boilers

Key benefits

Measures O2 concentrations in ppm or up to 21%

Extractive sampling equipment is not required

Suitable for high-temperature measurements

Ideal for

Measuring O2 in in-situ combustion processes, where the measuring probe can be directly installed into the flue for high-temperature combustion gas analysis, eliminating the need for extractive sampling equipment.

Explore the Zirconia analyzers we have for your process

Learn more about all our gas analyzer solutions that use this sensor technology.

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FluegasExact 2700

SERVOTOUGH Hazardous Area

Designed to measure O2 and COe in flue gases for improved combustion efficiency and reduced emissions.

The FluegasExact 2700 analyzer for effective combustion analysis
  • For combustion efficiency and reduced emissions
  • O2 only, or O2 & COe measurements in one sensor head
  • Ideal for all types of combustion processes
  • Robust, Industrial, fully-heated sensor head
  • Long-life, low-drift Oxygen sensing technologies
  • Close coupled, low flow extractive sampling design, extends product life

MultiExact 4100


A high-performance multi-gas analyzer designed to provide up to four simultaneous gas stream measurements.

SERVOPRO MultiExact 4100
  • Highly adaptable multi-gas analyzer
  • Provides up to four simultaneous measurements
  • Wide range of sensing technology options
  • Versatile solution for industrial and medical gases
  • Built-in support for moisture sensor
  • Optional advanced digital protocols

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Need more advice? Contact the gas analysis experts today

If you still need guidance to find the best solution for your process, we’re here to help. Our expert team combines applications knowledge with extensive experience and deep understanding of the sensing technologies available. We’ll help you find the solution that meets your unique needs.

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