Complex combustion systems and processes require besides a fast in-situ O₂ measurement to control the combustion, a quality measurement to adjust the combustion system at a level which avoids the generation of CO. The control level around the point of CO generation is the optimum of the combustion.

For this application AMS offers the flue gas probe AMS 3211-1600 with a dual sensor for the measurement of O₂and unburnt combustibles (CO, H₂ und hydrocarbons). The unburnt combustibles are measured as CO equivalent. Due to the fast response of the dual sensor both measuring values O₂ and COe can be used for burner optimization.

The COe in-line flue gas probe AMS 3211-1600 can be operated with the transmitter AMS 3220. The transmitter is available as twin version to supply separate signals for O₂ and COe.

The Sensor of the COe In-Line Flue gas probe AMS 3211-1600 is made of a electrochemical solid electrolyte sensor of partially stabilised Zircon dioxide ceramic.

The sensor has three electrodes:

• O₂ sensitive Platinum electrode
• CO / H₂ sensitive electrode made of Platinum / precious metal alloy
• Platinum reference electrode
   

The measurement of COe with the COe in-line flue gas probe AMS 3211-1600 is not a CO measurement in the classical sense. The flue gas probe AMS 3211-1600 measures in-situ the concentration of the sum of all combustible (oxidising) flue gas components such as CO and H₂. The result of the measurement is displayed as COe. In applications with a known fuel at a constant composition the true CO concentration can be determined within limits. The COe in-line glue gas probe AMS 3211-1600 can be used for the measurement of O₂ and Coe in natural gas, fuel oil # 4, lignite and hard coal.

The measuring range of the component COe is 1000 PPMv. For a quality measurement this range is quite sufficient, since the main purpose of the measurement is to avoid the generation of carbon monoxide. Due to the physical dimensions the sensor for measurement of O₂ and COe can also be used with all other flue gas probes of AMS.