Temperature mapping is a validation exercise in which multiple sensors are distributed throughout a cold store, reefer container or refrigerated vehicle to confirm that every storage position maintains the required temperature under representative load conditions.
In trade practice
Mapping studies are typically conducted when a cold store is commissioned, after significant structural changes, or when a new product category with different temperature requirements is introduced. Sensors are placed at positions identified as likely warm or cold spots, including near doors, corners and air-return vents, and data is collected over a defined period that includes door-opening cycles. Results identify zones that fall outside specification and inform loading patterns, sensor placement for routine monitoring and corrective engineering works. Third-party food safety auditors and some retailer standards require mapping records to be available for inspection.
In a specification
A supplier quality manual or cold-chain specification may require mapping to be performed at defined intervals and the results retained as documented evidence of facility qualification.