A port wait is not one interval; gate-in, yard moves, power connection, vessel changes and loading are separate events. Record each event time against the container number and add the carrier or terminal portal records to the shipment file. When the temperature trace shows a deviation, this is where you read which event happened at which time.
For a reefer, everything hangs on the power connection. Request the power service, keep the terminal's written confirmation, and when connected verify container number, time and unit status. If the request was not made or is unconfirmed, the container may wait unplugged; the unit does not run and the cargo is protected by insulation alone.
| Load arrangement | During the wait |
|---|---|
| Reefer, plugged in | Unit runs |
| Reefer, unplugged | Insulation only |
| Insulated container with plates | As long as plate capacity lasts |
| Uninsulated load | Unprotected |
Place the logger according to the product and shipment plan and note device ID and start time. On arrival compare the trace with unit and terminal records; one air reading does not describe the whole load. Decide before the schedule changes who talks to the terminal, who informs the receiver and who takes the quality decision. For loads that rely on plates, the plate count is chosen for the longest expected wait.
