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A temperature peak can follow an event; compare logger time, sensor position and route activity on one timeline.

If the curve does not fall after closure, compare starting conditions and sensor location before concluding that plates are insufficient.

Match shared events to a trusted time source and document clock offset without changing the raw file.

Find the last valid and first returning readings; do not estimate the temperature between them.

Compare raw values, known events and file completeness; a flat curve alone proves neither stability nor device failure.

Containers and plates may have cleaning lists while the rack is overlooked. Make the task visible with an owner, product-hold plan and completion record.

Review raw data, adjacent readings, device status and event evidence before excluding an outlier.

Control the comparison to separate device, clock and calibration differences from location effects.

Assessing every trip alone hides gradual performance change.

Do not treat the calendar day as a cause; match comparable trips and review deviation rates with run denominators and operating conditions.

Pair internal records with time-matched ambient readings, exposure and parking conditions before comparing similar trips.

An empty unit shows air change, while a loaded one includes product and packaging; assess each curve for its defined conditions and decision.

Fix the trip cohort, time basis and calculation method for percentile comparisons; the statistic alone is not a product decision.

Two short events and one long event can produce the same total duration.

A fixed limit sounds only after it is crossed. The hard part of a rate alarm is telling a door opening from a real failure; here is how to set the hold time, the sensor position and the WHO requirements.

Make graph review repeatable with event codes, start and end times, and an owner aligned to logger time.