Cold Chain
A cold chain is the temperature-controlled logistics network that keeps perishable goods — food, pharmaceuticals, and biologics — within required temperature ranges from origin to final delivery.
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Compare Telematics software →What a Cold Chain Is and How It Applies to Fleet Operations
A cold chain is the end-to-end system of refrigerated storage and transport that maintains temperature-sensitive cargo within defined limits at every step of its journey. For fleet operators, the cold chain begins the moment a refrigerated vehicle is loaded and ends at the point of delivery. Any gap — a reefer unit that malfunctions en route, a door left open too long during a stop, or a handoff with no temperature verification — constitutes a cold chain break, which can result in spoilage, regulatory violation, or product liability.
The fleet management challenge in cold chain operations is integrating vehicle tracking with temperature monitoring. Standard GPS fleet tracking shows where a vehicle is; cold chain management adds real-time temperature logging from the transport refrigeration unit (TRU) and cargo sensors. A temperature excursion — cargo rising above its upper limit — must trigger an immediate alert so the driver and dispatcher can respond before the entire load is compromised.
Regulatory compliance for cold chain fleets depends on cargo type. Food carriers must comply with the FDA FSMA Sanitary Transportation of Human and Animal Food rule (21 CFR Part 1.900), which requires temperature controls, cleaning procedures, and written training. Pharmaceutical distributors must follow Good Distribution Practice (GDP) guidelines, which require continuous temperature monitoring, excursion documentation, and qualified person oversight. Fleet management software that integrates with temperature sensors and generates automated compliance reports significantly reduces the manual burden of maintaining these records.
Vehicle maintenance in cold chain fleets includes two separate maintenance programs: the vehicle itself (engine, tires, brakes — standard fleet maintenance) and the TRU (refrigeration unit maintenance, refrigerant checks, belt inspections, and annual CARB TRU regulation compliance in California). TRU breakdowns are particularly costly because they can result in a full load loss. Predictive maintenance approaches — monitoring TRU runtime hours, refrigerant pressure trends, and engine fault codes — are a high-value use of fleet telematics in cold chain operations.
- Verify TRU set-point temperatures before loading — pre-cool the trailer to target temperature before cargo is loaded
- Log continuous temperature data during transit, not just at loading and delivery
- Set automated alerts for temperature excursions with driver and dispatcher notification
- Maintain FDA FSMA-required records: temperature logs, cleaning records, and driver training documentation
- Keep TRU maintenance logs separate from vehicle maintenance records — both are auditable
- Establish a documented cold chain break procedure: who to notify, when to quarantine, when to dispose