LogTag loggers that don’t have an internal sensor rely on having a probe connected to record the temperature.
So what happens when a logger tries to take a reading while the probe is not plugged in? It records the temperature as -40°.
So this is not a temperature that has been experienced – it is more like an error message.
Your refrigerator did NOT get that low.
You do NOT need to throw out your stock.
You do NOT need to report it to the Health Department.
It is a lack of readings, not a freezing fridge.
If you are monitoring vaccines and you are missing a large number of readings then you will have to use your manually recorded min/max temperatures as proof that your fridge was working at this time.
Latency, when it comes to temperature logging, refers to the delay between a change in temperature and when that change is detected and recorded by the logger. This delay can be due to the sensor’s design, the materials it’s placed in, or the logging interval. While it might sound like a disadvantage, latency can actually serve a useful purpose in certain environments—particularly where short-term temperature spikes are common but not harmful.
For example, in a busy commercial fridge, the temperature may briefly rise every time the door is opened. A logger with high latency won’t immediately react to these short fluctuations, helping to avoid unnecessary alarms or false data indicating a problem when there isn’t one. In these cases, a slight delay in response acts like a filter, focusing attention on real issues—such as prolonged exposure to unsafe temperatures—while ignoring the everyday ups and downs that don’t affect product quality or safety.
Depending on the type of logger you have, connecting your logger to your PC means either:
First Generation LogTags use a separate Reader (sometimes called a dock) for configuration and for downloading recorded data.
The Second Generation loggers only require a USB port or cable. Apart from saving the cost of the Reader, this makes them much better suited for shipping, because the recipient doesn’t need a LogTag Reader to download a report about the shipment’s journey.
