Electrochemical detection system and method of operation

An electrochemical detection system configured to determine a concentration of a gas in exhaust gases of a combustion process, said system comprising:

• an electrolyte;
• a reference electrode in contact with the electrolyte;
• a sense electrode in contact with the electrolyte and spaced apart from the reference electrode, wherein the electrolyte, the reference electrode, and the sense electrode cooperate to form an electrochemical sensor that exposes both the reference electrode and the sense electrode to the exhaust gases, wherein the electrochemical sensor is configured to output a sensor signal indicative of a species concentration of a species gas in the exhaust gases, wherein the electrochemical sensor signal exhibits a transient error in response to a change in a reference concentration of a reference gas in the exhaust gases;
• and
• a processor configured to determine the species concentration based on the sensor signal, and to determine an estimate of the transient error based on an operating condition of the combustion process.