Using CO2 Sensors in MAP Applications
MAP is a technique used to extend and prolong the shelf life of fresh products.
Modified Atmosphere Packaging, or MAP as it is commonly referred to within the industry is a technique used to extend and prolong the shelf life of fresh products, including fruit, vegetables, and meat.
There are two types of Modified Atmosphere Packaging. Active and Passive. The US Federal Drug Administration (FDA) defines active MAP as “the displacement of gases in the package, which is then replaced by a desired mixture of gases.” This differs from passive modified atmosphere packaging where “the product is packaged using a selective film type, and the desired atmosphere develops naturally because of the products’ respiration and the diffusion of gases through the film. The mixture of gases that are used in Modified Atmosphere Packaging vary depending on the product itself. The main gases used are Nitrogen, Oxygen and Carbon Dioxide.
Carbon Dioxide (CO2)
Carbon Dioxide is a colourless, odourless, and tasteless gas that makes it perfect for Modified Atmosphere Packaging applications. As a rule, the higher the concentration of CO2 used in the packaging, the longer the shelf life of the product. However, too much Carbon Dioxide gas can alter the flavour of the food, giving a sour taste. Additionally, as the gas is absorbed by the product, and escapes from the packaging over time, the packaging can collapse. As a result, CO2 is commonly used with other supporting gases to reduce the issues previously mentioned. Overall, a minimum level of 20% CO2 is recommended as this keeps bacteria and mould growth to a minimum.
Advantages of Modified Atmosphere Packaging
MAP has several advantages, both to the consumer, as well as to others in the supply chain. It is believed that food products that are packaged using MAP have a shelf life which is 50-500% longer than if they had not been packed with this technology.
This is done without the need for chemical preservatives. The extended shelf benefits the supplier of the product also, as there is a reduction in economic losses.
As food takes longer to spoil, it is more likely to be sold. This has a knock-on effect, reducing waste, which is a positive for the environment. The distribution chain also benefits from Modified Atmosphere Packaging, as longer shelf life of products means more products can be shipped at a time, and can be transported longer distances, resulting in fewer deliveries required.
MAP Requirements
When monitoring the levels of CO2 (or any other gas) used in Modified Atmosphere Packaging, it is crucial to obtain a reading as quickly as possible.
Delays in acquiring a reading mean either an increased number of product packages with incorrect gas levels, or the production line is run slower to match the measurement rate capability.
Advantages of GSS Sensors
Many Modified Atmosphere Packaging applications require a CO2 sensor that is capable of high- speed Carbon Dioxide readings. The SprintIR range of CO2 Sensors are built on unique, patented LED technology and optical designs that enable best-in-class speed, power consumption and durability. The SprintIR-R CO2 sensor can capture 50 readings per second, with a 70ppm typical accuracy, making it one of the fastest CO2 sensors on the market. As with all sensors in the SprintIR range, the SprintIR-R is ideally suited for MAP applications where CO2 levels are likely to change rapidly.
