Gas detection
sustainability in the face of rising climate concerns. In a catalytic combustion system, VOCs are decomposed by thermal oxidisation at lower combustion temperatures, which reduces the amount of auxiliary fuel required and can reduce NOx generation. However, there is a risk that the efficacy of the catalyst may be lost due to catalytic poisoning. VOC monitoring before and after abatement is essential for the optimisation of abatement efficiency, and for the rapid detection of potential problems.
MULTIPLEXED GAS ANALYSERS Signal’s extractive gas analysers can be multiplexed, which means that they can be connected to a multipoint sampling system so that one gas analyser can sequentially take measurements from multiple points – before and after abatement for example. To achieve this, Signal has developed a range of ancillary equipment to facilitate sampling from multiple points. For example, Signal’s Model 362 splits a single heated sample line into two filtered streams, allowing for parallel analysis of two different sample points. It includes a heated pump, gas distribution manifold, and multiple outputs, including one for a cooler/dryer. This facility to use one analyser for multiple sample points dramatically lowers the cost per measurement location.
MONITORING TECHNOLOGY Process managers are of course free to select the most appropriate gas analysis technique for process control, but where data are required for compliance purposes, it is likely that a certified standard reference method gas analyser is deployed. For example, the standard reference method for the measurement of TOC is flame ionisation detection (FID).
Signal’s latest FID, the SOLAR CEMNEX, recently passed a rigorous program of tests at TÜV in Germany. As a consequence, this monitor has MCERTS approval verifying compliance with the performance and uncertainty requirements specified in the UK’s Environment Agency Guidance: MCERTS for stack emissions monitoring equipment at industrial installations - Continuous emissions monitoring systems (CEMS) Updated 28 August 2024, EN 15267-1:2023, EN15267-2:2023, EN 15267-3:2007 and QAL 1 as defined in EN 14181: 2014.
SUMMARY
Process managers know and understand the measurement parameters that can help them to optimise their processes, but they may not be fully aware of the most effective and cost-efficient ways to implement a monitoring system. With over 40 years of experience in designing gas analysis systems, Signal’s in-house experts are able to provide help and advice in the key issues.
Signal Group
www.signal-group.com Instrumentation Monthly January 2026 51
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