Verifying Container Temperature Logs in International Shipping Channels
Validating reefer temperature logs requires auditing raw sensor data against carrier power records, environmental setpoints, and bill of lading clause terms.
Supply Air Temperature
Meaning
Initial thermal state of the conditioned air as it is blown into the cargo space by the refrigeration system. The supply air temperature is the coldest air in the circuit for chilled goods or the primary cooling medium for frozen loads. It must be strictly controlled to prevent surface freezing of sensitive items like fruit or flowers.
This value is the first point of contact between the cooling machinery and the stored product.
Setpoint Alignment
Internal electronics modulate the cooling cycle to keep this value as close to the agreed setpoint as possible. The supply air temperature is often lower than the overall target for frozen cargo to ensure deep cooling. For chilled cargo, the air is maintained just above the freezing point of the specific item.
Gradient Control
Consistent airflow ensures that the temperature remains uniform from the front of the container to the back. Monitoring the supply air temperature helps prevent hot spots where air might not reach. Proper distribution through the floor T-bars is necessary for this air to work effectively.
Equipment Performance
Changes in the ability of the unit to reach the required supply air temperature indicate a need for refrigerant recharge or coil cleaning. If the unit cannot drop the air temperature quickly enough, the cargo may suffer from heat stress. Reliable cooling starts with the precision of this initial output.