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 www.abb-drive.com 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.

Data

Oxygen only or oxygen plus combustibles

-Improved combustion efficiency

-Burner fault identification

-Enhanced plant safety

Tightly coupled sampling system

-Integrated flame arrestor

-Stabilized sample temperature and pressure

-Heated sample path

Comprehensive Diagnostics

-NAMUR-compliant diagnostic symbols

-Supports predictive maintenance

-Fully documented diagnostic events

Automatic sensor calibration

-Fully programmable schedules

-Local triggering

-Accuracy checking

Process logging and trending of all measurements

Calculated values

-Oxygen and carbon monoxide equivalent (COe)

-Process temperature measurement

-Combustion efficiency calculations

Multiple sample filters and back-purging options

-Optional dual filtration system

-Fully programmable blowback

Close Coupled Sampling System

The sensor assembly is mounted on the process wall and the probe and filter assembly extends into the process gas stream. A pneumatic injector is used to draw a sample from the process stream and feed it to the sensor head.

Oxygen analysis is performed by an industry standard zirconia cell.

Carefully metered dilution air is added and then calibrated for COe before the high sensitivity catalytic sensor is used to measure unburned combustibles.

The dilution air ensures a sufficient supply of oxygen to allow the COe sensor to function properly under abnormal process conditions where extremely low combustion oxygen levels may occur.

The tightly coupled extraction system enables tight temperature and pressure control of the sensor and sample gas.

This provides a stable background for target gas measurements, which improves the accuracy of the measurements.

Flame arrestors are installed in the sampling path to prevent flashbacks during startup when the combustible content of the process gas exceeds the Lower Explosive Limit (LEL), thus ensuring safe operation.

Flashback is prevented if the combustible content of the process gas exceeds the Lower Explosive Limit (LEL) during startup, shutdown, or process disturbances.

The sampling channel is kept hot to prevent acid gas condensation and corrosion.