Looks like you got it sorted. My random idea was to square it since the square of a negative number will be positive 
If you also know the maximum (or can guess one) - you can always just use a range node set to limit the range to the target range eg
That way anything outside will be clamped to the min (and max) values...
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@dceejay that will work for the psi for my fermenters, but not for inside functions when also using the psi data to calculate the volume of the boil kettle.
I did screen shot that on cell phone and added it to my project folder for further reference. Cheers
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