What a mapping study must establish
The study should demonstrate the spatial temperature distribution throughout the usable storage volume, identify hot and cold spots, confirm alarm locations and establish suitable positions for routine monitoring sensors.
The protocol should define the approved temperature range, logger accuracy, calibration status, sampling interval, study duration, acceptance criteria, load condition and handling of deviations before execution begins.
Risk-based logger placement
Place calibrated loggers in a three-dimensional grid and increase density around credible risk points: doors, evaporator discharge and return paths, corners, high and low levels, control probes, shelving restrictions and locations with previous excursions.
Logger placement should follow an approved rationale rather than a fixed universal spacing rule. Room geometry, airflow, heat load, door traffic, product arrangement and monitoring history all influence the design.
Empty, loaded and challenge studies
An empty-room study helps assess the installation and control response. A representative loaded study demonstrates performance under the condition used for routine storage. Where justified, door-opening and power-failure tests show recovery behaviour and the time available for operational response.
Seasonal studies are normally considered when external conditions can materially influence performance. The rationale should be documented, especially for facilities exposed to significant summer and winter variation.
From raw data to an approved report
The final report should preserve raw data, calibration certificates, logger positions, time-synchronized plots, minimum and maximum results, mean kinetic temperature where relevant, excursions, investigations and conclusions against every protocol acceptance criterion.
Use the identified hot and cold spots to locate permanent sensors, establish loading restrictions and update alarm, maintenance and contingency procedures. Mapping is not complete until its findings become operating controls.
A defensible execution path
- 1Define room and load risks
- 2Approve protocol and logger map
- 3Execute normal and challenge studies
- 4Investigate results and implement controls
Frequently asked questions
How long should a pharmaceutical cold-room mapping study run?
The duration must represent normal operations and relevant cycles. Many studies use at least 24 to 72 hours, but the justified duration depends on the room, equipment cycles, door traffic and governing requirements.
Should cold rooms be mapped while empty or loaded?
Both conditions may be needed. Empty testing supports installation understanding, while representative loaded testing demonstrates routine storage performance. The qualification plan should justify the selected approach.
When should mapping be repeated?
Repeat mapping after significant changes, major repair, unexplained excursions or changes to load and airflow. Periodic or seasonal requalification should follow a documented risk assessment and applicable local requirements.
Primary references
Use the current official publication and your applicable national requirements when approving a protocol or quality-system decision.
Need support applying this to your facility?
PHARPRO can scope the qualification, review your current documents or execute the work with your site team.
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