In this case study, we are going to talk about the low-temperature capability of temperature data loggers.

Here’s an example.

The graphic chart shows, that the unit has been experiencing an extremely low temperature(below -50 °C ) and was struggling to work in normal status, but it still managed to record temperature in a wider interval. So what’s the story behind it?

We all know for each temperature logger, it has a working range, for example, C1 is -30 to 70 °C as published in the specifications.

This means, to make sure the logger is recording any temperature between this range. The “extreme working temperature” should be wider than this range, and that’s why you can still get temperatures out of this range.

And in some extreme cases, like this one above which experienced around -50 °C, a reliable logger is developed with Active Protection Strategy(APS), to maximize the capability of recording in extreme conditions.

For end-user, you need to find out the temperature range indicated by the maker, is “guaranteed working range” or “extreme working range”.

Why is this useful and necessary? Because you never know the temperature your carrier may set to you goods, and surely you need to have the report in this case, especially the worst case.