As it says in the error message, the most common cause for this error is a low battery in your logger.
The first thing to try is to take the logger out of the Reader and put it back in. Sometimes, you can be lucky and the logger will find just enough charge to upload its readings. Try it a few times. Let the logger warm up and try it again.
However, if the battery is really gone, you will not be able to able to get the readings no matter what you do.
Diagnosing the low battery
The logger battery lasts for a few years at normal logging intervals, and it generally gives you a couple of months warning when it gets low. You will see the warnings on reports and the Configure panel.
Try opening the most recent report you were able to download from this logger. If you have the Low Battery notification, then the failed battery is most likely your problem.
Can a LogTag battery be recharged or replaced?
The Reader is dirty
Inside the Reader’s slot are three spring-loaded contacts that line up with the three contacts on the back of the logger.
On rare occasions, these contacts can become dirty and cause poor connection with the logger.
To clean these contacts, use a cotton tip dipped in alcohol.
The Reader is damaged
LogTag Readers are extremely sturdy and very rarely have physical failures. About the only part that can be damaged is the cable. Check the cable for kinks or splits – if it appears intact, then a damaged Reader is probably not your problem.
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.
