Nitrogen in Food Packaging: Applications and Flow Measurement Solutions

A key factor in product freshness, shelf life, and quality.

In the modern food industry, nitrogen in food packaging plays a vital role in preserving freshness and extending the shelf life of various products, including snacks, coffee, bakery items, and ready-to-eat meals. As an inert, non-reactive gas, nitrogen is widely used for gas flushing and modified atmosphere packaging (MAP).

Why Use Nitrogen Gas in Food Packaging?

🟦 1. Preventing Oxidation

Nitrogen displaces oxygen in the packaging, slowing down oxidation that causes rancidity, off-flavors, and discoloration.

🟦 2. Inhibiting Microbial Growth

By reducing oxygen levels, nitrogen gas flushing helps inhibit the growth of mold and spoilage bacteria, improving food safety.

🟦 3. Maintaining Package Integrity

Nitrogen fills the package and prevents it from collapsing, especially for fragile products like chips, acting as a cushion.

🟦 4. Extending Shelf Life

Nitrogen-packed food stays fresh longer, ensuring quality during transport and storage.

Measuring Nitrogen Flow Accurately Matters

To ensure proper gas flushing and optimize nitrogen usage, manufacturers must monitor nitrogen flow precisely. Poor control can lead to excess consumption or insufficient gas injection, both affecting product quality and cost-efficiency.

Choosing the Right Nitrogen Flow Meter

It all depends on your application conditions.

Not all nitrogen flow meters are created equal. Selecting the right technology depends on your application needs, installation conditions, and desired accuracy.

✅ Thermal Mass Flow Meter

Best for low-flow, packaging line control

  • Direct mass flow measurement, no temperature/pressure compensation needed

  • Highly sensitive to small flow changes

  • Excellent for low-speed nitrogen injection

  • Compact and low-maintenance

  • Ideal for nitrogen in food packaging systems

✅ Vortex Flow Meter

Best for high-accuracy nitrogen measurement

  • Measures volumetric flow based on vortex shedding

  • Suitable for custody transfer, quality-critical nitrogen monitoring

  • Works well in stable medium-to-high flow conditions

  • More suitable for central nitrogen gas supply pipelines

✅ Differential Pressure Flow Meter

Best for precise gas flow monitoring in demanding conditions

  • Multi-parameter compensation ensures accurate mass flow calculation

  • Flexible for large pipe diameters and wide flow ranges

  • Built-in pressure and temperature sensors for real-time correction

Comate’s Flow Meter Solutions for Nitrogen

Reliable. Accurate. Application-specific.

Comate provides full-spectrum flow measurement solutions tailored to the food industry. Our flagship TGF series thermal mass flow meters are widely used in nitrogen packaging systems:

  • Mass flow output directly

  • Accurate at low velocities

  • Fast response and real-time monitoring

  • Flexible installation (inline or insertion type)