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A single -5°C reading has been recorded by the LogTag monitoring a vaccine fridge. If this is a valid reading then the vaccines are potentially compromised and need to be destroyed.
Looking at the results around the single -5°C/18°C reading, there is a distinct cycle that is very consistent in size and period (15 to 20 minutes).
In short, no.
It is not physically possible for a fridge to significantly drop or rise 9°C in 5 minutes without an extreme event occurring. The thermal latency of the LogTag also means that the device won’t respond instantly to changes. Assuming that the sudden step down was legitimate, it is almost impossible for the fridge to then jump back to normal conditions again.
If this single reading was to be ignored, the shape of the graph is totally consistent.
Therefore, taking everything into account, the only logical course of action is to ignore the outlier.
On the basis of the data around the reading, the reading is obviously false and can be classified as a misread. There has been no compromise to the quality of the fridge’s contents.
If this is a one-off event, ignore it completely. If it happens a number of times, replace the LogTag.
Additionally, we strongly recommend upgrading to a more modern, wireless data logging system called Clever Logger.
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LogTag Temperature Recorders are distributed in Australia by
KEEP OUT OF REACH OF CHILDREN
LogTag loggers contain small batteries. Swallowing can lead to chemical burns, perforation of soft tissue, and death. Severe burns can occur within 2 hours of ingestion. Seek medical attention immediately.