When it shuts off, it only turns off the backlight, the text will still show.
But it should be resetting the current data after the default of 7 minutes. The tank data will remain the same, but the current screen should go to all 0's.
The timeout value is in microseconds, so the default is 420000000. I would try changing that to a different value to see if that works. I have mine set to 3 minutes (180000000), there's no real reason for it, but you can change it to pretty much anything. Just don't make it too small, or it'll be shutting off too early.
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