Blank Space in the Data Graph
Why is there a blank space in the data graph?
Causes and Troubleshooting:
To do that thing, you do this other thing.
Does the blank space correspond to a time when the Temperature or Humidity rose or fell quickly?
Does the blank space correspond to a time when the Temperature or Humidity fell below or rose above the scale limits on the screen
Were the AC power and back-up battery disconnected at the same time?
Try a wider vertical range setting or download the data to a PC. If there is still a gap in the data, try resetting the unit. If the problem continues, return for service.