The sensor can be reset by holding the button for approximately 10 seconds.
Before doing anything after charging up the data logger, always fully factory reset the device before trying to set it up, and after any failed setups. To do this depress the front button for approximately 20 secs until the LCD display reads 'FA5r', then release the button, it will then be fully factory reset. Do not be tempted to release when it gets to approximately 10 secs when the display will change to read 'r5t', make sure you keep the button fully depressed. We do get a lot of customers who release too early and only reset the device!
IT IS RECOMMENDED THAT YOU ARCHIVE THE DEVICE ON YOUR FILESTHRUTHEAIR™ CLOUD DEVICES PAGE BEFORE UNDERTAKING A FACTORY RESET.