Analytical Instrumentation & Environmental Monitoring


MAP – making the right choice for gas analysis

August 2021 Analytical Instrumentation & Environmental Monitoring

Modified atmosphere packaging (MAP) is used within the food and pharmaceutical sectors to extend the shelf life of many products that would otherwise deteriorate quickly in the presence of oxygen.

It replaces the atmospheric air inside a package with a protective gas mix that helps ensure that the product will stay fresh for as long as possible. Gas analysis plays an essential role in making certain that the gas mix is correct for maintaining product quality. The Servoflex MiniFoodPack 5200 is specifically designed to meet the needs of the food and pharmaceutical industries for this application. It enables accurate quality control checks for common gas mixtures used for MAP.

A compact, robust analyser, the MiniFoodPack 5200 is a portable benchtop device that is easy to set up and operate. It has minimal maintenance requirements and delivers industry-leading monitoring of oxygen and carbon dioxide, with single or dual-measurement options.

For oxygen (O2), the analyser uses Servomex’s proven, state-of-the-art paramagnetic sensing technology, which provides fast, accurate and sensitive measurements at percentage levels. The paramagnetic cell consists of two nitrogen-filled glass spheres, mounted within a magnetic field on a rotating suspension. The cell also has a centrally located mirror: light that shines onto the mirror and is reflected onto a pair of photocells.

O2 is naturally attracted to the magnetic field, so it displaces the glass spheres and causes the suspension to rotate. This is, in turn, detected by the photocells. Current is applied through a feedback coil, providing sufficient torque to return the suspension to its original position. The magnitude of the applied current is thus directly proportional to the O2 present in the sample gas mixture.

Carbon dioxide (CO2) measurements are provided by Servomex’s advanced, non-depleting infrared sensor. This focuses an infrared light source through a sample cell – holding a continuously flowing sample of the gas mixture – and onto a detector after wavelength selection. The property of CO2 to absorb a unique light wavelength is then used to detect the concentration of the gas in a mixture.

Paramagnetic and infrared technologies are both non-depleting i.e. the sensor cells never need changing (unlike electrochemical cells) and performance does not deteriorate over time. This means that the MiniFoodPack 5200 has a long operational life and does not require much work to calibrate or maintain.

Additionally, the analyser is highly flexible, with a rechargeable battery option for complete portability and a range of sampling accessories that allow measurements to be taken from rigid or flexible packaging. This includes an internal pump with solenoid valve option for external vacuum pump or syringe sample draw.

The MiniFoodPack 5200 is part of Servomex’s Servoflex range of portable analysers for accurate, reliable gas analysis, each developed to meet specific application requirements. The products are ergonomically designed to be easy to handle, compact enough to use anywhere and robust enough to be carried around.


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