AZ40

The AZ40 oxygen and combustibles analyzer continuously samples and analyses combustion waste gases to determine the levels of excess oxygen and unburned fuel (also known as combustibles and determined by measuring the carbon monoxide equivalent (COe)). Accurate measurement of both oxygen and COe is important for the safe, reliable and efficient operation of industrial combustion plant.

Close-coupled sample system

The sensor assembly is mounted on the process wall with the probe and filter assembly extending into the process gas stream. The sample is extracted from the process and fed through the sensor head using an air-powered ejector.

Oxygen analysis is made by an industry-standard zirconium oxide cell.

Carefully metered dilution air is added before unburned combustibles are measured by a high-sensitivity catalytic sensor calibrated for COe. The dilution air ensures a sufficient supply of oxygen to enable the COe sensor to function during abnormal process conditions when very low combustion oxygen levels can occur.

The close-coupled extractive system enables careful temperature and pressure control of the sensors and sample gas. This provides a stable background for target gas measurement to enhance its accuracy.

Operational safety is ensured by the inclusion of a flame arrester in the sample path to prevent flash-back if the process gas combustible level exceeds the lower explosive

limit (LEL) during start-up, shutdown, or process disturbance.

The sample path is maintained at high temperature to prevent acid gas condensation and corrosion.