Zirconia Sensor

The measurement works on the principle that, in the presence of an electrolyte, a current will flow between solutions or gases containing different concentrations of a chemical species, due to a difference in chemical potential.
In a typical measurement cell, ZrO2 acts as the electrolyte and as a high temperature catalyst producing oxygen ions. One side of the cell, which is coated with platinum, forms the flue gas side electrode while a reference electrode is in contact with an O2 containing reference gas, usually air. The measurement cell must be heated to a temperature of approximately 600°C. Facilities also exist for the introduction of zero and span gases to the measurement side of the sensor.

 

 

 

 

• Very accurate and reliable measurement of O2;
• A fast response time (for in-situ measurement) makes it ideal for process control applications;
• It is a well-understood technology with examples at most boiler plant (for combustion control);
• It has a low capital cost and low maintenance.
• The measurement is on a wet basis. The level of water vapour must be known to calculate the concentration on a dry basis;
• This method requires a supply of air and zero and span gas to be available at the measurement site.

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