Will PID lose its memory if unplugged for months?

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HearthstoneBrewery

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My Auber PID has been unplugged for months while I was on brewing hiatus. Do I need to run the auto-tune again, or will it have retained the parameters?
 
I would not say for certain, but most likely these units would use EEPROM or Flash to store this data, b/c they don't seem to have a backup battery. So they should be able to store the data for years.
 
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