ABB EasyLine EL3000 Series Continuous gas analyzers

ABB EasyLine EL3000 Series Continuous gas analyzers

Overview of the gas analyzers

Measuring technology (analyzers)

The following analyzers are available for selection:

• Uras26 infrared photometer

for the measurement of infrared-active gas components,

e.g. CO, NO, SO 2

• Limas23 ultraviolet photometer

for the measurement of NO, NO 2 and SO2

• Magnos206 oxygen analyzer

for the measurement of O2 in process gas or in N 2

• Magnos28 oxygen analyzer

for the measurement of O2 in process gas or in N 2

• Magnos27 oxygen analyzer

for the measurement of O2 in flue gas or in N 2

• ZO23 trace oxygen analyzer

for the measurement of O2 in pure gases (N 2, CO 2, Ar)

• Caldos27 thermal conductivity analyzer

for the measurement of binary gas mixtures with different

thermal conductivity, e.g. Ar in O2, H 2 in Ar, CH4 in N 2

• Fidas24 flame-ionization detector

for the measurement of hydrocarbons

• Electrochemical oxygen sensor

for the measurement of O2

Magnos206 and Magnos28 can also be used in combination with

Uras26 or Limas23.

Magnos27 and Caldos27 can also be used in combination with

Uras26.

Fidas24 and ZO23 cannot be used in combination with one of the

other analyzers.

The electrochemical oxygen sensor can only be used in combination with Uras26 or Limas23. 

Two electrochemical oxygen sensors can be used in combination with Uras26 with separate gas paths (only in model EL3020).

Each analyzer has one physical measurement range per sample component. 

A section of the physical measurement range can be mapped to the current output (analog output) by on-site configuration.

Calibration is always executed in the physical measurement range. 

The permissible measurement range limits are given by the specification of the smallest and largest measurement ranges for the individual analyzers.

A total of up to five measurement components can be measured with one gas analyzer.

Calibration

Calibration can be performed automatically or manually or exter-

nally controlled via the Modbus.

Automatic calibration for all sample components together is normally started on a cyclically time-controlled basis; 

it can also be started by an external control signal or via the 

Modbus as well as manually on the display and operator control unit of the gas

analyzer.

Normally, simplified calibration methods with the built-in calibration cells or the socalled single-point calibration are used for automatic calibration. 

If calibration with test gases is required the control of solenoid valves for switching on five test gases, 

zero gas and sample gas via digital outputs can be configured

Measurement techniques and ranges

Uras26 Infrared Photometer: Based on the principle of non-dispersive infrared absorption, with 1 or 2 beam paths,

it is possible to measure a wide range of gases such as CO

CO2 and other gases. Minimum measuring ranges e.g. 0 - 100 ppm for CO, 

number of measuring ranges 2, freely adjustable within the specified range, special versions for air separation units.

Limas23 UV-photometer: UV-RAS and NDUV method for NO, NO 2 and SO2, up to 3 components, 

with adjustable measuring ranges, e.g. 0 - 50ppm to 0 - 5000ppm for NO.

Oxygen analyser series: Oxygen analysers Magnos206, Magnos28, Magnos27 and ZO23 measure oxygen content based on different principles. 

The measuring ranges can be adjusted, e.g. 

Magnos206 and Magnos28 have a minimum measuring range of 0 - 2 vol.% O2Magnos27 has a measuring range of 0 - 10 vol.% O2, 

and ZO23 can be adjusted from 0 - 1 ppm to 0 - 250,000 ppm O2.

Other analysers: the Caldos27 thermal conductivity analyser for binary gas mixtures, 

the Fidas24 flame ionisation detector for hydrocarbon measurements 

and the electrochemical oxygen sensor for oxygen measurements each have their own specific measurement ranges and application scenarios.

Stability and influencing factors

Stability indexes: Each analyser has different performance in terms of stability, 

such as Uras26 with linearity deviation ≤1% of span and repeatability ≤0.5% of span; 

Limas23 with linearity deviation ≤1% of span and repeatability ≤0.5% of span, etc. 

These indexes reflect the measurement results of the analysers, such as the Uras26 with linearity deviation ≤1% of span and repeatability ≤0.5% of span. 

These indicators reflect the reliability of the analyser's measurement results.

Influencing factors: Flow rate, temperature, air pressure and other factors will affect the measurement. 

For example, Uras26 is within the detection limit of flow rate in the range of 20 - 100l/h; Limas23 is within the permissible range of ambient temperature, 

with zero point ≤1% of span per 10 °C, and sensitivity ≤1.5% of measured value per 10 °C.