Temperature-Controlled Loads

General orientation, not legal advice; food safety obligations differ by jurisdiction.

A refrigerated vehicle carries a legal obligation as well as a load, and the temperature record is the evidence.

What has to be recorded

Temperature in the load space, continuously, with timestamps.

Which is a food safety requirement in most jurisdictions for chilled and frozen goods in transit.

Retained for a period — commonly measured in months or years depending on the product.

Available to an inspector, which means retrievable per vehicle per date rather than in a device somebody has to plug into.

What the sensors add

Excursion alerts in time to act, which is the operational value: a load can be saved if the problem is found in the first hour.

Door open events, which explain most short excursions and distinguish a delivery from a fault.

Set point against actual, which catches a unit failing to maintain rather than failing outright.

Multi-zone readings on vehicles carrying chilled and frozen together, where one figure is not enough.

Reading an excursion properly

Not every excursion is a problem.

A door opening for a delivery produces a rise that recovers, and a system that alerts on every one produces the alert fatigue this collection keeps returning to.

Duration and magnitude together determine whether the load is affected, and the thresholds come from the product specification rather than from the device default.

Which means the excursion rule is a food safety decision, made with whoever owns that, not a telematics setting.

The disposal question

When an excursion is genuine, someone decides whether the load is still fit.

That decision needs a stated rule, a named person and a record.

Made in advance, because at six in the morning with a full load the pressure is to deliver.

And the record matters as much as the decision, because a later complaint will ask what was known and when.

Where it goes wrong

Sensors in the wrong place, reading the return air rather than the load.

Calibration, which drifts and which inspectors ask about.

Records held only in the device, so a vehicle sold takes the evidence with it.

And alerts to a driver who cannot act, rather than to someone who can reroute or dispatch a repair.

The measure

Excursions by cause, per vehicle.

Proportion resolved within the actionable window.

And calibration currency across the fleet, which is a compliance figure and is usually worse than assumed.

Set the excursion rule with food safety

Not with the telematics settings.

Duration and magnitude together determine whether a load is affected, and the thresholds come from the product specification.

Which makes it a food safety decision taken with whoever owns that.

Agree the disposal rule in advance too, because at six in the morning with a full load the pressure is to deliver.

Turn the boundary into a test

For a concrete product reference, this remote-team example can help turn this boundary into a test. Verify the current behaviour with representative fields and record what reaches the destination.

Independent reference

For a thematic point of reference, see the U.S. Food and Drug Administration. This popular specialist site offers a useful independent reference for the issue.