Thermal Mapping for Cold Chain and Warehouses: Why It’s Required
Thermal mapping proves temperature uniformity across a whole cold room or warehouse, not just at one sensor. Here is what it measures and who needs it.
Thermal mapping is one of the most commonly required, and most commonly misunderstood, validation activities for cold chain and controlled-storage operations in Bangladesh.
What Thermal Mapping Actually Measures
Unlike a single calibrated thermometer, thermal mapping places multiple data loggers throughout a cold room, warehouse or reefer van to record temperature variation across the entire space over time, typically 24 to 72 hours, capturing hot spots, cold spots and door-opening recovery.
Who Needs It
- Pharmaceutical cold storage and vaccine chains (DGDA and WHO-GMP expectation)
- Food and beverage cold rooms and reefer transport
- Warehouses storing temperature-sensitive raw materials
- Cleanroom and compressed air systems where uniformity affects product quality
Why a Single Thermometer Is Not Enough
A cold room can hold its set point at the control sensor while still having a corner 4 to 5 degrees warmer near the door or a fan. Regulators and auditors specifically ask for a mapping study, not a single-point reading, because that is the only way to prove uniform storage conditions across the whole space where product actually sits.
How Often to Re-Map
A full re-mapping is typically expected after any significant change: a new layout, added racking, a different door, a new HVAC unit, or on a periodic cycle defined by your quality system, commonly every one to two years for stable installations.
Our thermal mapping service covers cold rooms, warehouses and reefer vans, with a full uniformity report you can hand directly to an auditor.
Need this done in your plant? ION Engineering is an ISO/IEC 17025:2017 accredited calibration laboratory serving industry across Bangladesh. Request a quotation or call +88 01713 588601.