Inside a closed container cold air is heavy and sinks, warmed air rises, and points near walls and corners sit closer to the outside. The area around the lid is the first to feel every opening; GEBHARDT states that frequent and long lid openings affect the container's inside temperature. Plate layout, fill and route decide which point is warmest and which is coldest, so it is measured rather than guessed.
- Use the same load and the same plate and product layout for one round, and show the layout in a drawing.
- Run several loggers at the same time: at product level, in the middle, in selected corners and near the lid, and code every point.
- Record device ID, calibration status, and loading and arrival times.
- Look at each sensor as its own series on the chart.
The logger goes at the warmest point, because the worst value is what matters, not the average; a logger in the middle reports below the real risk. The TİTCK GDP guideline asks for the same method in cold rooms: mapping finds the worst-case points and monitoring devices go there. A map holds only for the container, load and route tested, and is redone when the layout changes.
