ABB AO2020 URAS26 Continuous Gas Analyzer with Uras26 Infrared Measurement Module for Multi-Component Gas Analysis

ABB AO2020 URAS26 Product Overview

The AO2020 URAS26 configuration consists of two closely related
elements: the AO2020 central analyzer platform and the Uras26
infrared analyzer module. The central unit provides the system
controller, display, interfaces and overall analyzer management,
while the Uras26 module performs the infrared gas measurement.

This modular architecture is an important characteristic of the
ABB Advance Optima system. Instead of treating every gas component
as a completely independent analyzer, selected measurement modules
can be integrated into a common analyzer platform.

ABB documentation identifies Uras26 as one of the analyzer modules
available for the AO2000 platform. Other modules in the same family
include Limas21, Magnos206, Magnos27, Magnos28, Caldos25, Caldos27,
ZO23 and Fidas24. The specific combination depends on the measurement
requirements of the application.

Uras26 Infrared Analyzer Technology

Uras26 uses non-dispersive infrared, commonly abbreviated as NDIR,
measurement technology. The method is based on the characteristic
absorption of infrared radiation by gas molecules.

Different gases absorb infrared radiation at characteristic
wavelengths. By analyzing the change in infrared radiation as the
sample gas passes through the optical measurement path, the analyzer
can determine the concentration of selected infrared-active
components.

ABB describes Uras26 as a dual-beam infrared analyzer. The dual-beam
arrangement is an important part of the optical measurement principle
because it provides a reference path for comparison with the
measurement path.

This architecture is designed to support stable measurement in
continuous process applications where gas composition and operating
conditions can change over time.

Multi-Component Gas Measurement

One of the key characteristics of the Uras26 module is its ability
to measure multiple gas components. ABB states that Uras26 can
measure up to four components with measurement ranges extending
from very low concentrations to high concentration levels depending
on the selected optical configuration.

Typical gas components associated with the AO2000-Uras26 system
include carbon monoxide, nitric oxide, sulfur dioxide and carbon
dioxide. The exact combination depends on the analyzer configuration,
application requirements and selected measuring ranges.

Multi-component measurement is particularly useful in continuous
emission monitoring because several relevant gases can be evaluated
through a coordinated analyzer platform rather than requiring
separate standalone instruments for every component.

Carbon Monoxide Measurement

Carbon monoxide, or CO, is one of the gas components that can be
measured by the Uras26 infrared analyzer. CO measurement is relevant
to combustion processes, industrial furnaces, boilers and emission
monitoring systems.

Monitoring carbon monoxide provides information about combustion
conditions and can help process operators evaluate changes in the
composition of flue gas. The appropriate measuring range depends
on the process and the concentration level expected in the sample.

ABB certification documentation for the AO2000-Uras26 identifies
configurations with CO measurement and provides corresponding
certification ranges for approved applications.

Nitric Oxide Measurement

Nitric oxide, or NO, is another gas component that can be measured
using the Uras26 infrared measurement principle. NO monitoring is
important in combustion and emission-control applications because
nitrogen oxide compounds are key parameters in environmental
monitoring.

The AO2000-Uras26 platform can be configured for NO measurement
either as an individual component or together with other infrared
components. The selected configuration determines the available
measuring range and the overall analyzer arrangement.

Sulfur Dioxide Measurement

Sulfur dioxide, or SO2, can also be included as a measured component
in an AO2000-Uras26 configuration. SO2 measurement is particularly
relevant to combustion systems and industrial processes where
sulfur-containing fuels or raw materials are involved.

Continuous SO2 measurement allows process operators and environmental
monitoring systems to observe changes in gas concentration. ABB’s
certification documentation includes Uras26 configurations designed
for SO2 measurement and specifies corresponding certified ranges.

Carbon Dioxide Measurement

Carbon dioxide, or CO2, is another component supported by selected
Uras26 configurations. CO2 is a common combustion and process-gas
measurement parameter and can provide valuable information about
combustion conditions and process performance.

In a multi-component configuration, CO2 can be measured together
with other infrared-active gases. The analyzer configuration determines
the selected components and the corresponding measurement ranges.

ABB certification documentation for AO2000-Uras26 includes configurations
combining CO, NO, SO2 and CO2 within one analyzer system.

AO2020 Rack-Mount Analyzer Housing

The AO2020 is the rack-mount housing variant within the AO2000
analyzer family. ABB documentation identifies AO2020 as a 19-inch
housing designed for rack installation, while AO2040 is the
corresponding wall-mount housing variant.

The rack-mount construction makes the AO2020 suitable for analyzer
cabinets and centralized instrumentation panels where multiple
analytical functions need to be integrated into a structured
installation.

The central unit manages the analyzer system and communicates with
the installed analyzer modules through the system architecture.
Each analyzer module contains its measurement sensor and associated
electronics and communicates with the system controller.

Analyzer Module Architecture

The modular architecture of the AO2000 family allows different
measurement technologies to be combined according to the application.
Uras26 provides infrared measurement, while other modules provide
ultraviolet, oxygen, thermal conductivity or flame-ionization
measurement functions.

This modular design provides flexibility when building a continuous
gas analysis system. A system can be configured around the gases and
analytical principles required by the process instead of using a
single fixed measurement arrangement for every application.

The AO2020 URAS26 configuration therefore represents a combination
of the central analyzer platform and a specific infrared measurement
module rather than a simple standalone sensor.

Measurement Ranges

The available measuring range of an AO2020 URAS26 depends on the
selected gas component, optical configuration and analyzer setup.
ABB documentation shows that Uras26 can support measurement ranges
extending from low concentration levels to high concentration
ranges.

In the TÜV performance certification for AO2000-Uras26, representative
certified ranges include 0–75 mg/m³ for CO, 0–150 mg/m³ for NO,
0–75 mg/m³ for SO2 and 0–20 volume percent for CO2. Additional
ranges are also documented for some components.

These figures should not be interpreted as universal ranges for every
AO2020 URAS26 configuration. The actual measurement range is
determined by the installed analyzer configuration and the gas
components selected for the particular system.

Oxygen Measurement Options

The AO2000-Uras26 system can also be configured with an oxygen
measurement cell. ABB certification documentation identifies
configurations with either a paramagnetic oxygen measuring cell
or an electrochemical oxygen measuring cell.

The oxygen measurement function is separate from the infrared
measurement principle used by Uras26. This illustrates the modular
nature of the AO2000 platform, where different measurement technologies
can operate within the same overall analyzer architecture.

Depending on the application, an analyzer can therefore combine
infrared gas measurement with oxygen measurement to provide a more
comprehensive analysis of combustion or process gas.

Industrial Process Applications

ABB AO2020 URAS26 is suitable for continuous gas analysis applications
where reliable measurement of selected process or emission gases is
required. The system can be used in industrial process measurement,
combustion monitoring and emissions-related applications.

Typical applications can include boilers, furnaces, combustion
installations, industrial production processes and continuous
emission monitoring systems. The exact application depends on the
selected analyzer configuration, sample conditioning system,
measurement ranges and required approvals.

The modular analyzer architecture also makes the system adaptable
to applications requiring more than one gas component.

Continuous Emission Monitoring

Continuous emission monitoring systems require stable measurement
of relevant gas concentrations over extended operating periods.
The AO2020 URAS26 configuration can form part of such a system by
providing continuous infrared analysis of selected gas components.

ABB’s AO2000-Uras26 certification documentation specifically covers
modular measuring systems for plants requiring official approval
and installations within the scope of applicable emission-monitoring
regulations.

Depending on the selected configuration, measurements can include
CO, NO, SO2, CO2 and oxygen. The exact certified combination and
range must be determined from the analyzer’s configuration and
applicable certification documentation.

Calibration and Measurement Stability

Proper calibration is an important part of continuous gas analysis.
The AO2000 operating instructions include dedicated calibration
information for Uras26, including procedures involving calibration
cells and suitable calibration gases.

The analyzer’s optical measurement system and sample-gas conditions
influence the measurement result. Correct calibration procedures,
appropriate sample conditioning and suitable reference gases are
therefore important parts of the overall analytical installation.

The required calibration interval depends on the installed analyzer
configuration and the application. ABB certification information
indicates that maintenance intervals can vary according to the
installed module configuration.

ABB AO2020 URAS26 Technical Specifications

System Integration

The AO2020 URAS26 is normally integrated into a complete gas analysis
system rather than connected directly to an industrial process as
an isolated instrument. The overall system can include sample probes,
heated sample lines, filters, condensate management, gas coolers,
flow-control components and calibration-gas connections.

The analyzer receives a conditioned sample gas and performs the
required measurement through the installed Uras26 module. The
resulting concentration information is then processed and presented
through the central analyzer system.

Correct sample conditioning is particularly important because the
quality of the gas reaching the optical measurement cell can affect
analytical performance. Installation requirements therefore depend
on the process gas, temperature, pressure, moisture content and
potentially interfering components.

Analyzer Identification

When identifying this equipment, the complete description
ABB AO2020 URAS26 is useful because it specifies both
the central analyzer housing and the installed infrared analyzer
module.

AO2020 identifies the rack-mounted analyzer housing, while Uras26
identifies the infrared analyzer module. These designations should
not be treated as unrelated products because Uras26 operates as an
analyzer module within the AO2000 architecture.

The exact gas configuration should additionally be determined from
the analyzer nameplate, installed module information and configuration
data. Different Uras26 systems can contain different combinations
of gas components and measurement ranges.

Why the AO2020 URAS26 Architecture Is Important

The combination of a central analyzer platform and dedicated
measurement modules provides a flexible approach to continuous gas
analysis. The AO2020 manages the analyzer system while Uras26
performs the infrared measurement function.

This architecture allows several gases to be analyzed within one
coordinated system. It also allows additional analytical technologies
to be incorporated where required, including oxygen measurement
through the appropriate analyzer module.

For industrial plants, this modular approach can simplify the
organization of measurement functions and provide a consistent
interface for process monitoring and emission analysis.

Conclusion

ABB AO2020 URAS26 is a continuous gas analyzer configuration within
the ABB Advance Optima AO2000 family. The AO2020 provides the
19-inch rack-mount analyzer platform, while Uras26 provides the
dual-beam non-dispersive infrared measurement function.

Depending on the selected configuration, Uras26 can measure up to
four infrared-active gas components. Typical components include
carbon monoxide, nitric oxide, sulfur dioxide and carbon dioxide.
Selected AO2000-Uras26 configurations can also incorporate an
oxygen measurement cell using either a paramagnetic or electrochemical
measurement principle.

The ABB AO2020 URAS26 is therefore well suited to continuous process
gas analysis and emission monitoring architectures where multiple
gas components must be measured within an integrated analytical
platform. The exact gas combination, measurement range and oxygen
configuration depend on the installed analyzer configuration and
application requirements.