Brand: ABB

ABB Endura AZ25 Combustion Gas Oxygen Analyzer

Name: ABB Endura AZ25 Zirconia O2 Analyzer | In-Situ Probe
Brand: ABB

Description

Overview

The ABB Endura AZ25 is an in-situ combustion gas oxygen analyzer built around a zirconium oxide (zirconia) sensor cell. The probe is inserted directly into the flue or process gas stream, eliminating sample conditioning systems and their associated maintenance. It provides fast, drift-stable O2 readings for combustion trimming and emissions control in power, cement, petrochemical and steel applications.

Engineering and Design

Measurement range is 0 to 25% O2 with a system accuracy better than +/-2.0% of reading or 0.2% O2, whichever is greater, at reference conditions. Initial dead time is about 3 seconds and T90 response is under 10 seconds, which allows tight combustion control. Long-term drift is below +/-1% of the maximum range value per month, and manual, semi-automatic or fully automatic calibration (AutoCal) keeps the analyzer accurate without removing the probe from the process.

Probes are available in insertion lengths from 0.5 m to 1.25 m with flanged connections. The standard aluminum-porcelain probe measures flue gas at 600-1250 C; the Incoloy 800 version covers 600-850 C. The electronics and AutoCal unit are rated IP66 (NEMA 4). A galvanically isolated, programmable 4-20 mA output and HART (with DTM) connect to any DCS or PLC, and two relay outputs plus AutoCal solenoid outputs handle alarms and automatic calibration sequencing.

Key Features

In-situ zirconia measurement – no sample system required
Range 0-25% O2 with accuracy better than +/-2% of reading or 0.2% O2
Fast response: initial dead time about 3 s, T90 under 10 s
Low drift: below +/-1% of max range value per month
Probe insertion lengths 0.5 to 1.25 m for 600-1250 C flue gas (porcelain) or 600-850 C (Incoloy 800)
Manual, semi-auto and AutoCal calibration with solenoid and test-gas support
Isolated 4-20 mA output with HART and DTM support
IP66 (NEMA 4) electronics and AutoCal; 100-240 V AC supply, under 10 W

Applications

Flue gas and combustion air O2 measurement in power generation, cement kilns, petrochemical furnaces, steel reheat furnaces and other fired processes for combustion efficiency and emission control.

Specifications

Measurement Range	0 to 25% O2
System Accuracy	+/-2.0% of reading or 0.2% O2 (whichever is greater, reference conditions)
Response Time	Initial dead time about 3 s; T90 under 10 s
Drift	Under +/-1% of maximum range value per month
Sensor	Zirconium oxide (zirconia) cell, in-situ probe
Insertion Lengths	0.5, 0.7, 0.8, 0.9, 1.0 and 1.25 m
Process Temperature	600-1250 C (aluminous porcelain); 600-850 C (Incoloy 800)
Transmitter Ambient	-20 to +55 C; storage -40 to +85 C
Enclosure	IP66 (NEMA 4)
Power Supply	100-240 V AC +/-10% (90-264 V), 50/60 Hz, under 10 W
Output	Galvanically isolated 4-20 mA, programmable; HART with DTM
Relays	2 x NC, 5 A at 230 V AC / 30 V DC
AutoCal	2 solenoid outputs, 2 test-gas detection inputs
Reference Air	0.3-0.5 L/min; Test Gas: 1 L/min
EMC	EN 61326-1:2006

Why Seven Star LLC

Seven Star LLC supplies original ABB Endura AZ25 analyzers, probes, AutoCal units and spare parts for combustion control projects across Oman and the GCC. Our engineers help you select the correct probe length and mounting for your furnace or boiler geometry.

Call To Action

Send your flue gas temperature, duct dimensions and control system interface to our engineering team for a quotation. Use the Inquiry Form below and attach your datasheet or site drawing – we confirm availability and pricing. | Inquiry Form

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About brand

ABB is one of the world’s leading technology companies in electrification and automation, recognized for its commitment to innovation, reliability, and energy efficiency. With a history spanning more than a century, ABB delivers high-performance products and systems that help industries operate more intelligently and sustainably.

The company’s expertise covers a wide range of fields including power distribution, process automation, robotics, motion control, and digital solutions for smart manufacturing. ABB’s products are designed to enhance productivity, safety, and operational efficiency while reducing energy consumption and environmental impact.

Seven Star LLC supplies a complete selection of genuine ABB products, including industrial drives, PLCs, contactors, sensors, relays, and automation components, serving clients across oil & gas, energy, marine, and manufacturing sectors.

By combining ABB’s advanced engineering with Seven Star LLC’s trusted sourcing and support, customers gain access to reliable, future-ready industrial solutions built to meet the most demanding standards of modern industries.

Click to view complete ABB information.

Frequently Asked Questions

How does the ABB Endura AZ25 measure oxygen?

The AZ25 uses a zirconium oxide (zirconia) sensor cell mounted in an in-situ probe inserted directly into the flue or process gas. No sample conditioning system is needed.

What is the measurement range and accuracy?

The measurement range is 0 to 25% O2 with a system accuracy better than +/-2.0% of reading or 0.2% O2, whichever is greater, at reference conditions. T90 response is under 10 seconds.

Which probe lengths and temperatures are supported?

Probes are available in insertion lengths from 0.5 m to 1.25 m. The aluminum-porcelain probe measures flue gas at 600-1250 C; the Incoloy 800 version covers 600-850 C.

What outputs and communication does the AZ25 provide?

It provides a galvanically isolated, programmable 4-20 mA output with HART and DTM support, plus two relay outputs (5 A) and AutoCal solenoid outputs for automatic calibration sequencing.

How is the AZ25 calibrated?

Calibration can be manual, semi-automatic or fully automatic. The optional AutoCal unit uses solenoid valves and test gas (1 L/min) with reference air (0.3-0.5 L/min) to calibrate without removing the probe from the process.

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