Gas sensing Reduced temperature and
pressure effects are achieved by a gas flow bypass system thermally decoupled from the sensor block. This ensures defined internal flow and minimises influences on the detector temperature balance. Intelligently arranged sensors also detect and compensate for external influences.
How does tHe
Magnos28 acHieve tHis HigH
perforMance?
The Magnos28 is produced using the latest digital manufacturing technology, enabling sub-micrometer precision to ensure each device performs to specification. This completely new approach
is ideally suited to paramagnetic oxygen measurement. It allows the analyser to have a very low mass and high width-to-thickness ratio, together with an optimised magnetic field distribution in the measurement position. Employing tolerances one-
offers drastically reduced moisture influence, while its response to other dia- and paramagnetic gases matches theoretical values, reducing measurement uncertainty. An ingenious system of internal
gas flow management directs the process gas instantly to the highly responsive microwing, giving up to a 15 percent improvement in response time. Its internal chamber volume is reduced by factor of three. Combined with completely redesigned gas paths and optimised drillings, this results in rapid gas exchange. For extra speed there is also a
special version offering a rise time of less than 1.3 seconds, making it one of the fastest magneto- mechanical oxygen sensors available. A minimum required gas flow of only 0.15 l/min makes the Magnos28 the perfect choice for processes with rapidly changing oxygen concentrations. Minimising external influences
delivers unprecedented resolution. A wide dynamic range and high suppressed ranges are achieved by an immediate 32 bit A/D conversion next to the physical sensor, minimising signal noise. This improves performance across complete 0.5 to 100 vol% O2 range.
hundred times smaller than the width of a human hair, the microwing is automatically positioned and bonded to a platinum wire. This accuracy gives perfect alignment in the centre of the magnetic field, with all processes carried out under absolute clean conditions to give maximum reproducible quality. Each step is tightly controlled
and verified, ensuring accurate production of each sensor. The patent pending sensor balancing process, together with the laser ablation process that etches off miniscule amounts of wafer coating, avoids the need for complex manual tasks conducted using a microscope. Careful selection of inert
materials minimises drift and significantly improves solvent resistance - neither glue nor solders are used within the core of the Magnos28, while special coatings protect sensitive parts, such as the pole shoes.
How can i find out More?
To find out more about ABB’s range of industrial gas analysers email
enquiries.mp.uk@
gb.abb.com or call 0870 600 6122 ref. ‘Industrial Gas Analysers’.
ABB Instrumentation Monthly June 2021
www.abb.com 41
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