GAS SAMPLING SYSTEMS FOR NUCLEAR APPLICATIONS
S35 Gas Sampling Systems, Total Oxidation Units, Spares and Service (formerly manufactured by Severn Science Ltd )
MechaTech Systems manufactures, supplies, and maintains S35 gas sampling systems and total oxidation units (TOUs) for the nuclear power industry.
Our equipment is used for accurate sampling and analysis of Sulphur‑35, Carbon‑14, and Tritium in air and carbon dioxide, supporting safe and compliant operations across UK nuclear sites.
Trusted by organisations including EDF and Nuclear Restoration Services (NRS), we provide complete solutions including systems, spare parts, and ongoing maintenance support. Contact Us for a quote or further information.
What is an S35 Gas Sampling System?
An S35 gas sampling system—also known as a Total Oxidation Unit (TOU)—is designed to collect and analyse radioactive gases and airborne particulates within nuclear environments.
These systems are used to:
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Monitor radioactive emissions
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Ensure environmental compliance
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Support decommissioning and operational safety
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Measure isotopes such as S35, C14, and Tritium
Applications in Nuclear Power & Monitoring
Our gas sampling systems are widely used across:
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Nuclear power stations
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Decommissioning facilities
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Environmental monitoring programmes
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Radioactive air sampling and analysis
They provide reliable data for regulatory compliance, safety assurance, and operational monitoring.
S35 Gas Sampling Systems (Total Oxidation Units)
MechaTech Systems manufactures and supports S35 multipurpose gas sampling systems designed for demanding nuclear environments.
Key Features
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High‑temperature oxidation capability
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Accurate isotope sampling (S35, C14, Tritium)
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Designed for air and carbon dioxide sampling
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Robust, field‑proven performance
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Fully supported with spares and servicing
Supported Isotopes
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Sulphur‑35 (S35)
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Carbon‑14 (C14)
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Tritium (H‑3)
Mobile Gas Sampling Units
We also provide mobile particulate gas sampling units for flexible deployment across nuclear sites.
These units are designed for:
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Sampling airborne particulates
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Monitoring radioactive iodine species
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Temporary or mobile monitoring requirements
Spare Parts for Gas Sampling Systems
We supply a complete range of spare parts for S35 gas sampling systems, including equipment originally manufactured by Severn Science.
Available Components
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S35 tube furnaces (110V)
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Silica reaction tubes
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Thermocouples
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SC575 furnaces
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High‑temperature gaskets
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Drechsel bottle carriers
All parts use original part numbering for easy identification and compatibility, originally supplied by Severn Science Ltd. See below for a downloadable spares list.
Maintenance & Service Contracts
As an experienced supplier to EDF and NRS, we provide comprehensive maintenance and repair services for gas sampling systems.
Our services include:
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Scheduled on‑site maintenance
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Repairs and fault diagnosis
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System upgrades and modifications
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Service contracts at preferential rates
We support both MechaTech Systems and legacy Severn Science equipment.
Why Choose MechaTech Systems?
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Trusted supplier to UK nuclear operators
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Experience with EDF, NRS, and supply chain partners
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Full lifecycle support (supply, spares, maintenance)
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Achilles UVDB registered and audited - see QA certificates
FAQs – Gas Sampling Systems
What is a Total Oxidation Unit (TOU)?
A TOU is a system used to oxidise and capture radioactive gases for measurement and analysis.
What isotopes can your systems measure?
Our systems are designed for S35, Carbon‑14, and Tritium.
Who uses gas sampling systems?
Primarily nuclear power operators, decommissioning organisations, and environmental monitoring teams.
Do you service older Severn Science equipment?
Yes, we provide spares, servicing, and upgrades for legacy systems.