Gas mixing control system for the preservation of aquatic products using modified atmosphere packaging.

The products derived from aquatic sources are nutritious due to their abundance of moisture, protein, and various other nutrients. Nonetheless, their vulnerability to deterioration and spoilage is significant when affected by microorganisms and internal enzymes. In order to extend the storage period and shelf life of aquatic products, we have developed a gas control system for preserving seafood with modified atmosphere packaging. At its core, this system integrates technologies from the Internet of Things, sensors, network communication, and PLC control systems. This system connects the PLC controller, the Internet of Things cloud box, and the remote client to ensure uninterrupted communication. Utilizing the TCP/IP communication protocol and 4G network, the Internet of Things cloud box acts as a data transmission transceiver, sending the observed operational data directly to the Internet of Things cloud platform. This feature enables remote observation of the gas-mixing process, preserving freshness through web browsers and mobile devices, and freeing it from geographical limitations. The system test shows that after gas mixing is completed, the gas concentration error of the mixed gases is less than 1%. The gas mixing precision is high, the operation is stable, and the process is easy to manage. This significantly reduces the cost of gas packaging equipment and extends the storage and preservation period of aquatic products, providing a reference method to improve the automation level of modified atmosphere storage and preservation for aquatic products.