Eutectics and insulation

The K coefficient on an ATP certificate is a laboratory result measured over 2-3 days in a closed tunnel, not a thickness claim. It uses a 25-degree difference, 24 sensors and strict stability conditions.

ATP has a class of equipment that carries no mechanical unit but does carry a cold source. The text names eutectic plates alongside natural ice and dry ice, and defines the class temperatures at an outside air temperature of +30 °C.

Using the MEB food table and a 600 kg milk example, shows how sensible heat and heat of freezing are calculated separately.

Door openings at stops build the service heat load. Here are ASHRAE's Dt, Df and E factors and how to keep a trip record.

In a passive cold chain the cold is not made on the road: plates are frozen at the depot, the container is pre-cooled, and no unit runs on the vehicle. ATP classes, plate freezing temperatures and a worked example of heat entry into the container follow below.

Match container identity, interior condition, required equipment and route in one work order; tie dispatch sign-off to completed checks.

Document external damage before unpacking; compare identity, model, fittings and accessories with the order and track open items separately.

Give each physical container a stable internal ID; link model, serial and replaceable label to it.

Match the wash record to the container ID; record visible cleanliness, dryness and closure checks against site release criteria.

Put opening counts in context by matching events with time, stop and task notes.

Plan shelf layout from real package size, weight and delivery order; verify model-specific limits in the technical documentation.

Place only defined trip documents in the pocket, match them to the box ID and assign a role to clear it on return.

A display gives a point reading; a logger records over time. They answer different monitoring questions.

Record castor position, observed symptom and load state; leave dispatch disposition to the authorized site process.

Record fork entry, base connections and floor contact; use an actual handling trial to decide whether maintenance review is needed.

Record a new mark by location, date and photo. If contact recurs, inspect the same area in warehouse and vehicle flow.