Oxygen analyzers and sensor solutions for engine test cells, exhaust gas analysis, catalytic converter efficiency monitoring, dynamometer testing, and air-fuel ratio control.
Oxygen measurement is central to automotive emissions testing, engine development, and exhaust gas analysis. The concentration of residual oxygen in an exhaust stream directly reflects combustion efficiency, air-fuel ratio accuracy, and the operating condition of the catalytic converter. Whether the application is a production engine dynamometer test cell, a vehicle emissions compliance test, catalyst efficiency validation, or R&D development of next-generation powertrains, reliable oxygen analysis is a core requirement.
This application note explains the major automotive emissions and exhaust testing applications, why oxygen measurement matters at each stage, and which Southland Sensing analyzers and sensors are best suited for your test facility or process.
Why oxygen monitoring matters: Continuous or spot-check oxygen measurement in exhaust streams provides direct insight into combustion efficiency, air-fuel ratio accuracy, and catalyst function — enabling engineers to optimize engine performance, reduce emissions, and validate compliance with increasingly stringent automotive emissions standards.
OMD-480
Rugged portable analyzer with smart MENU interface, configurable alarm outputs, and USB data logging. Well suited for spot checking exhaust oxygen levels at the tailpipe, sampling catalyst inlet and outlet streams during bench testing, and verifying combustion gas composition on engine test stands.
✓ Built for Combustion & Emissions Monitoring
OMD-150
Rugged CE-marked wall mount transmitter with configurable percent oxygen measurement and multiple electronic output options including 4–20 mA. Suited for permanent installation on engine test cell exhaust sample lines and stationary combustion engine emissions monitoring points.
OMD-625
ATEX and IECEx certified for explosive atmospheres. Suited for engine test cell environments where fuel vapor accumulation is a concern, as well as hydrogen fuel cell vehicle test cells and other hazardous-area exhaust monitoring points.
⚠ ATEX · IECEx Certified
OMD-507
Compact footprint with configurable electronics and a choice of sensor housings, suited for integration onto automated test stand sample conditioning systems, catalyst test rigs, and multi-channel emissions analysis benches.
Accurate oxygen analysis in automotive exhaust and emissions applications depends not only on the analyzer itself, but also on a properly designed sample handling and conditioning system. Exhaust gas streams present challenging sample conditions including elevated temperature, water vapor, particulate matter, and corrosive combustion by-products — all of which must be addressed before the sample reaches the electrochemical sensor.
A properly engineered sample system includes temperature reduction, moisture removal or management, and particulate filtration to deliver a clean, conditioned, and representative gas sample to the analyzer at the correct flow rate and pressure. Response time requirements and the number of sample points also influence the design of the sample handling system for multi-channel test cell installations.
Southland Sensing offers application support to help customers properly specify sample systems for automotive exhaust and emissions testing environments. Contact the factory to discuss exhaust gas composition, temperature, sample conditioning requirements, and installation conditions to ensure the analyzer system is properly configured for your test cell or process.
Fixed ambient oxygen monitors should be installed in any enclosed engine test cell or chassis dynamometer bay where exhaust gas accumulation or asphyxiating inert gas displacement is a potential hazard. Our monitors provide continuous room-air O₂ measurement with audible and visual alarms at user-configurable setpoints (typically 20.0% and 19.5% O₂) to help protect personnel and comply with facility safety requirements.
Refer to our O₂ Sensor Compatibility Guide to confirm the correct sensor for your analyzer model and exhaust gas conditions.
Residual oxygen concentration in the exhaust stream is a direct indicator of air-fuel ratio and combustion completeness. Excess oxygen indicates a lean-running condition, while near-zero oxygen in the exhaust alongside high CO or HC typically indicates rich operation. Monitoring oxygen across the catalyst inlet and outlet also gives a direct indication of catalyst efficiency and light-off behavior during cold-start and warm-up test cycles.
Our electrochemical oxygen sensors are designed for conditioned gas samples and are not intended for direct insertion into hot, unconditioned exhaust streams. A sample conditioning system that reduces temperature, removes condensate and particulates, and controls flow is required upstream of the analyzer. Please contact our applications team to discuss sample conditioning requirements for your specific exhaust gas conditions.
Yes. The OMD-625 carries ATEX and IECEx certification, making it suited for hydrogen fuel cell vehicle test cells and other hazardous-area environments where flammable gases including hydrogen may be present. Contact us to discuss the full installation requirements.
Yes. Both the OMD-480 portable and the OMD-150 wall mount transmitter are well suited for spot checking and continuous monitoring of oxygen in stationary combustion engine and generator exhaust streams for emissions compliance and combustion efficiency purposes.
Yes. Several models support Modbus RTU or MODBUS ASCII bi-directional digital protocols, allowing direct integration with test cell data acquisition and control systems. Contact us to confirm which models match your system’s communication requirements.
Reliable oxygen monitoring is not optional in automotive emissions and exhaust testing — it enables combustion optimization, confirms catalyst efficiency, supports emissions compliance, and keeps test cell personnel safe. Southland Sensing offers a complete range of instruments for every oxygen measurement point in the automotive test and development environment.
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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