Glossary
Cold Chain
The unbroken sequence of proper temperature control a perishable product needs from origin to delivery. A single failure point, a reefer malfunction or a door left open too long, can compromise a load.
What Cold Chain means in practice
The cold chain is the unbroken run of temperature control a perishable product needs from origin to delivery, and a single failure point can compromise a load. In practice, the distribution leg is usually the hardest part to control because a trailer between stops runs for hours with nobody watching. The common failures are a reefer unit that malfunctions mid-route, a door left open too long on a multi-stop run, and product that was not pre-cooled before loading. A check at pickup and another at drop-off can miss all three.
Continuous monitoring closes that gap. A sensor in the cargo area reports temperature with a location and timestamp, and an alert fires when a reading leaves the safe range, so dispatch can reroute, warn the customer or call a technician while the load can still be saved.
The same record answers buyers and auditors who ask for proof of handling, and settles disputes when a customer says a load arrived out of range. Mixed fleets usually start with the refrigerated vehicles carrying the tightest-range products, such as dairy and fresh proteins.
Read the full explainer
The definition above is the short version. The page below explains Cold Chain in depth, with the rules, numbers and examples behind it.
Cold Chain Compliance for Food & Beverage FleetsGuides that explain Cold Chain
- GPS Fleet Tracking for Food and Beverage Distributors: Routes, Temperature and Delivery Windows
- One Bluetooth Gateway for Thirty Sensors on a Truck or Trailer
- Bluetooth Temperature Sensor Puck: A Ten-Year Wireless Thermometer for Reefers and Coolers
- Wired Reefer Temperature Monitoring for Multi-Compartment Refrigerated Trucks
Cold Chain: common questions
Does FSMA require electronic temperature monitoring?
Not by name. The FDA's Sanitary Transportation rule, issued under the Food Safety Modernization Act, requires temperature-sensitive food to be transported safely and requires action when temperature control fails. It is risk-based rather than tied to one technology, so continuous electronic monitoring is a practical way to meet it, not a named legal mandate.
What temperature should a refrigerated load be kept at?
It depends on the product. Frozen goods, fresh produce, dairy and pharmaceuticals each have their own safe range, and the customer's contract or the product specification sets the real numbers. That is why the alert band in a monitoring system should be set per product rather than using one fixed rule of thumb for every load.
Which vehicles should get temperature sensors first?
Start with the refrigerated side of the fleet, where the compliance and spoilage exposure lives, and keep dry vehicles on standard GPS tracking on the same platform. Within the reefers, prioritize by product risk: trailers regularly hauling dairy or fresh proteins, with tight ranges and short spoilage windows, come before those carrying more tolerant packaged goods.