Oxygen analyzers and sensor solutions for furnace atmosphere control, carburizing, annealing, sintering, brazing, and other thermal processing applications.
Metals heat treating and thermal processing rely on tightly controlled furnace atmospheres to achieve the correct metallurgical properties in the finished part. Even trace amounts of oxygen can cause scaling, decarburization, or discoloration on the metal surface, compromising both appearance and mechanical performance.
This application note explains the major heat treating and thermal processing methods, why oxygen measurement matters at each stage, and which Southland Sensing analyzers and sensors are best suited for your process.
Why oxygen monitoring matters: Continuous or intermittent oxygen monitoring helps verify atmosphere quality, detect air ingress, and protect both part metallurgy and process safety across critical thermal
OMD-150
Rugged wall-mount transmitter built for the production floor. Multiple input power options support direct integration with furnace control systems for steel production and continuous annealing lines.
OMD-501X
1/4 DIN panel mount analyzer with a remote sensor housing, keeping electronics safely away from furnace heat. A common choice for metals treating, inert glovebox systems, and combustion control.
OMD-507
Same measurement performance in a compact housing. Configurable input power and sensor housing options make it well suited for sintering lines and skid-mounted thermal processing equipment.
✓ Configurable Design
OMD-625
Engineered for explosive atmospheres. ATEX & IECEx certified — suited for furnace exhaust monitoring and thermal processing lines using flammable carrier gases such as hydrogen or endothermic gas.
⚠ ATEX · IECEx Certified
Accurate oxygen analysis in metals and heat treating applications depends not only on the analyzer itself, but also on the proper design of the sample handling system. Factors such as sample temperature, particulate content, pressure, and material compatibility can significantly impact measurement stability, response time, and overall analyzer performance.
A properly engineered sample system helps ensure that the analyzer receives a clean, stable, and representative gas sample under the correct operating conditions. Proper temperature reduction, filtration, and sample conditioning can often make the difference between a reliable oxygen measurement and inaccurate or unstable readings near a furnace environment.
Southland Sensing offers application support to help customers properly specify sample systems for demanding thermal processing applications. Contact the factory to discuss process conditions, gas composition, temperature, flow requirements, and hazardous-area considerations to ensure the analyzer system is properly configured for your installation.
Fixed ambient monitors should be installed at low-level points in any enclosed heat treating or furnace room where inert purge gases such as nitrogen or argon are used. Our monitors provide continuous room-air O₂ measurement with audible and visual alarms at user-configurable setpoints (typically 20.0% and 19.5% O₂).
Refer to our O₂ Sensor Compatibility Guide to confirm the correct sensor for your analyzer model and process application.
Yes. Our electrochemical sensors are designed and tested for use in inert gas backgrounds, from below 1 part-per-million oxygen up to percent-level concentrations. Nitrogen and argon do not interfere with the electrochemical oxygen measurement.
Most of our process analyzers measure below 1000 parts-per-million but can also cover the 0–1% or 0–25% O₂ range depending on the furnace type and process requirement. Please contact our sales team to discuss suitable options.
Yes. The OMD-625 carries ATEX and IECEx certification, making it suitable for monitoring furnace exhaust streams and other hazardous-area points where flammable carrier gases such as hydrogen or endothermic gas are present.
Sensor life is typically 24 – 60 months under most industrial heat treating conditions, however specific furnace temperatures and duty cycles can affect sensor life. We recommend an annual sensor audit and keeping one spare per analyzer for unplanned replacements. Swap-out is tool-free and takes under a few minutes.
Yes. Several models support Modbus RTU or MODBUS ASCII bi-directional digital protocols, allowing direct integration with furnace control or SCADA systems. Contact us to confirm which models match your site’s requirements.
Reliable oxygen monitoring is not optional in metals and thermal processing — it protects **part quality confirms atmosphere integrity ensures **process consistency and keeps personnel safe. Southland Sensing offers a complete range of instruments for every point in the heat treating process.
Our application engineers assist with sensor selection, installation, and hazardous area questions.
Our application engineers are available to assist with sensor selection, installation guidance, and hazardous area classification questions for your hydrogen production system.
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