The Endura AZ25 combustion oxygen analyzer is the latest in a long line of high-quality, combustion gas analyzers from ABB. The AZ25 is designed to measure oxygen concentration in high temperature furnace atmospheres.
The sensor, based on a zirconium oxide cell, is mounted at the tip of the probe that is inserted directly into the furnace. The resulting direct, in-situ measurement provides an accurate and rapid oxygen reading, for combustion control /optimization and process quality control purposes.
The in-situ technique provides a true oxygen measurement inside the process. It eliminates ‘equilibrium shift’ that is common to systems in which gas samples are extracted and cooled before measurement.
Reference air (500 to 1000 ml/min [1 to 2 ft3 /hr]) is required for accurate operation and can be supplied from an ABB mains-powered pump unit or a flow regulator unit.
Applications
· Furnace atmosphere monitoring
· Annealing furnace
· Sintering of metals
· Ferrite sintering
· White heart malleablizing
· Combustion measurement and control in:
– Soaking pits
– Process heaters
– Fluidized bed boilers
– High temperature incinerators
· All other combustion processes where the flue gas temperature is in excess of 600 °C (1112 °F)
Probe lengths up to 1250 mm (49 in.)
A wide range of probe insertion lengths allows for optimum sensor positioning within the furnace or flue duct to ensure accurate and representative oxygen measurement.
A comprehensive range of mounting flanges, provide simple installation when plant-wide standard flanges are required or when replacing existing probes.
The remote transmitter can be mounted up to 100 m (328 ft.) from the probe. Probe locations are often high temperature, hostile and inaccessible areas, the flexibility of long cable lengths permits appropriate siting of the remote transmitter
Sheath material options
To ensure material compatibility with the process conditions there is a choice of three sheath materials:
· Aluminous porcelain
– Entry level sheath material suitable for applications with temperatures up to 1250 °C (2282 °F).
– Limited resistance to corrosive chemicals and mechanical and thermal stress.
· Recrystallized alumina
– Suitable for applications with temperatures up to 1400 °C (2552 °F).
– Resistant to corrosive chemicals and severe mechanical and thermal stress.
· Incoloy 800
– Suitable for applications with temperatures up to 850 °C (1562 °F) when mounted horizontally and up to 1000 °C (1832 °F) when mounted vertically.
– Limited resistance to corrosive chemicals but resistant to mechanical and thermal stress.
The Endura AZ20 is the latest in a long line of high-quality, combustion gas analyzers from ABB.
The sensor, based on a zirconium oxide cell, is mounted at the tip of the probe that is inserted in the flue duct. The resulting direct, in situ measurement provides accurate and rapid oxygen reading for combustion control optimization and emissions monitoring.
Probe Lengths up to 4.0 m (13.1 ft.)
A wide range of probe insertion lengths from 0.5 to 4.0 m (1.7 to 13.1 ft.) enable installation to the optimum measuring point for accurate oxygen measurement within the duct; even in the largest flue gas ducts and stacks.
A comprehensive range of mounting flanges provide simple installation when plant-wide standard flanges are required or when replacing existing probes.
The transmitter can be probe- or remote-mounted at distances of up to 100 m (328 ft.), thus providing versatile system options for all applications. The probe-mounted transmitter option provides the lowest cost of installation. However, the remote-mounted transmitter provides flexibility when the operationally ideal probe location does not provide easy access for the user.
Advanced Design
Designed and manufactured to exacting standards, the Endura AZ20 ensures long periods of trouble-free operation in even the most arduous of applications.
The operating process temperature of up to 800 °C (1472 °F) extends system suitability into previously impossible applications and enables optimum probe location within the process.
The modular design, with reduced component count, improves the robustness and reliability of the system and simplifies routine maintenance and servicing. Complete traceability ensures only the highest quality materials are used in the analyzer's construction and rigorous manufacturing, inspection and testing procedures (to international standard ISO 9001) result in a monitor of superior quality with prolonged probe life.
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