What is an oxygen analyzer for MAP packaging?

An oxygen analyzer for modified-atmosphere packaging (MAP) measures residual oxygen (O₂) in the headspace of a package. Depending on the model, it can also measure carbon dioxide (CO₂). The result describes a sampled gas and helps document a packaging quality-control process.

An analyzer does not, by itself, determine food shelf life, microbiological safety or regulatory compliance. It is a measurement instrument within a wider control system. Readings must be interpreted in the light of the food, its packaging and the applicable production procedures.

The phrase 'oxygen analyzer' can describe quite different devices, including instruments for combustion, industrial processes, clinical applications and exhaust gas measurements. This guide concerns the instruments used to sample the atmosphere of sealed food packages. Control y Suministros does not sell those other categories of oxygen analyzers.

For a sealed package, the focus is the gas inside the headspace, not emissions from a plant. Our product sheets therefore explain which gases a model measures and which type of use its manufacturer describes, without treating unrelated technologies as interchangeable.

Headspace means the volume of gas remaining between a product and its package seal. Sampling this space provides an O₂ reading and, if the analyzer supports it, a separate CO₂ reading. They are different measurements, so they should always be identified individually.

An O₂-only model does not measure CO₂ simply because a different procedure is used. Our range contains both single-gas and dual-gas instruments. Any reading should be considered alongside the sampling conditions and the customer's own procedures, rather than interpreted as an isolated preservation guarantee.

According to VIGAZ, an adhesive septum is first attached to the chosen sampling point on the package. A needle connected to the analyzer is inserted through the septum. The device pump then draws a gas sample and the instrument displays a reading for the gas or gases supported by that model.

The septum helps preserve the seal at the sampling point. The manufacturer warns that omitting it can let outside air enter and distort the reading. Puncturing, setup and calibration should follow the current manual for the individual model because the exact process varies between instruments.

This guide does not give unsupported sampling volumes, precision specifications, statutory food limits or fixed response times. Those values must be checked against the relevant model documentation and real working conditions before being quoted in an industrial procedure.

VIGAZ distinguishes compact handheld devices intended for occasional checks from equipment designed for more frequent measurements. According to its FAQ, it does not recommend small handheld analyzers for intensive production: their sensors are more sensitive to cold and ambient humidity, miniature pumps are less resistant to repeated sampling and housings are less robust against impacts.

This is the manufacturer's classification of intended usage, not a numerical promise of throughput. The gases to be measured, frequency of sampling and working environment are relevant when discussing a product with our team and consulting official product sheets.

According to VIGAZ, if O₂ or CO₂ readings do not change during a measurement, a common cause is a blocked filter or needle preventing the pump from drawing gas. The manufacturer recommends replacing these parts and checking pump suction. Other symptoms should be assessed using the official service instructions.

VIGAZ also explains that returning the analyzer to ambient air between consecutive measurements is not necessary. Keeping the sensor close to sampling conditions may shorten its subsequent response time. This guidance should be understood as part of the manufacturer's procedure, not a universal performance claim.

Available categories of consumables include adhesive septums, filters, needles and calibration gas cylinders. Availability of a particular accessory and any after-sales service offered by our business must be confirmed separately; this article does not assume they are included.

An analyzer gives a gas measurement; an indicator provides a visual signal according to its specific design; an oxygen absorber captures oxygen inside a package or enclosure. They may be useful in related processes, but they are not substitutes for one another. An absorber cannot replace quantitative testing when a protocol requires a recorded residual O₂ value.

Explore oxygen indicators, oxygen absorbers and our guide to oxygen absorbers. For gas measurement instruments, see the VIGAZ MAP analyzer range.

The range contains four named models, distinguished by measured gases and the usage described by VIGAZ. Two have individual pages on this site; information about the others is available on request.

The table below lists catalogue facts rather than comparative results for accuracy, durability or performance between instruments.

We can help you examine which kind of analyzer may suit your application by discussing packaging, the gases you need to measure and sampling frequency. Our guidance is based on manufacturer documents and does not replace the customer's own process validation.

You can also review the MAP analyzer comparison guide or use the contact form to request more information.

Can a small handheld analyzer be used in intensive production?

VIGAZ does not recommend it: such devices are more sensitive to cold, humidity, repeated miniature-pump use and impacts.

Must an analyzer be returned to air between measurements?

No, according to VIGAZ. Keeping the sensor in measurement conditions can shorten its subsequent response.

Why does an O₂/CO₂ reading not change during measurement?

According to VIGAZ, a blocked needle or filter is a common cause. The manufacturer suggests replacing them and checking pump suction.

Is an adhesive septum always necessary?

Yes, according to VIGAZ: it helps seal the puncture and avoids outside air distorting the measurement.

How long does an oxygen sensor last?

The CANAL111 sheet quotes four years in air. This should not automatically be generalized to other models or conditions.

Where are VIGAZ analyzers made and repaired?

The manufacturer identifies VISCIANO facilities in France for production and after-sales service.

What is the difference between measuring O₂ and O₂ plus CO₂?

CANAL111 II and BOX100 II measure O₂; CANAL121 III and BOX120 II can measure O₂ and CO₂ according to the model range.