Oxygen Measurement During Inerting and Tank Storage

Whether in reactors, centrifuges, dryers, tank farms, or filling plants: Inerting is one of the established processes in the chemical industry for reducing explosion risks, protecting oxidation-sensitive products, and ensuring stable process conditions. However, what matters most is not just the supply of inert gas, but reliable information on whether the required oxygen concentration in the process is actually achieved and maintained over the long term.

In practice, inert gas is often dosed conservatively. Without continuous oxygen monitoring, this leads to unnecessarily high inert gas consumption, longer purging times, and avoidable downtime. Conversely, inadequate monitoring can jeopardize both product safety and explosion protection. Continuous O₂ measurement therefore enables a targeted balance between safety, quality, and cost-effectiveness.

Not All Inerting is the Same

From a technical standpoint, a distinction must be made between partial and total inerting. In partial inerting, the oxygen concentration is reduced to a level that ensures it remains safely below the system-specific oxygen limit concentration. In total inerting, the inert gas content is so high that no explosive mixture can form even if air enters the system. Which strategy is appropriate depends on the substance system, process control, and safety concept.

A key point for operators: The permissible oxygen concentration is not a fixed standard value. It depends on the medium, temperature, pressure, and inert gas, and must also be defined with safety margins to account for fluctuations, measurement deviations, and response times.

Measurement Provides Peace of Mind—and Reduces Costs at the Same Time

Continuous oxygen measurement is much more than just a safety requirement. It serves as an early-warning system, enables defined alarm strategies, and supports stable process control. At the same time, it offers economic benefits: nitrogen can be regulated as needed, purging processes can be shortened, and batch changes can be accelerated. Especially with large volumes and frequent inerting cycles, this measurement technology thus becomes a significant cost driver—or a source of savings.