Michell Instruments XZR500 combustion control oxygen analyser

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The XZR500 combustion control oxygen analyser from Michell Instruments is designed to perform just one specialised function: to monitor the oxygen levels in combustion processes. Its purpose is to determine the optimum amount of air needed for combustion, ensuring the fuel is used efficiently, potentially saving thousands of dollars.

The XZR500 uses Michell’s zirconium oxide oxygen sensor, which has a metallic sealed reference (MSRS) to give long-term reliability. The combination of this type of sensor, placed in an isothermal oven within the analyser (not the probe), negates the effects of varying, high temperatures as well as the corrosive nature of the gas.

The XZR500 has a control unit which can be placed at ground level for convenience, a sensor head close-coupled to the stack for ease of installation and quick response, and a variety of probe materials allowing a wide range of applications to be addressed.

For most applications the probes use the Pitot effect to extract non-conditioned sample gas from the process to the sensor head and back to the flue. Placing the probe as close to the burner as possible gives the most accurate readings, so the XZR500 has ceramic probes capable of operating effectively in temperatures up to 1300°C.

Typical applications for the XZR500 include combustion efficiency for boilers, industrial waste incinerators and crematoria. When operated in extremely dirty applications, such as coal-fired power stations, the XZR500 can be offered with a blow-back mechanism for increased reliability in readings and reduced manual intervention.