Hi Steve -

Seems sort of odd that the vendor told you to leave the system on at all times
- did this vendor provide some logic for that instruction?

My personal feeling is to turn the systems off over night, or into a low idle
mode.  As you've noted, solvent loss is a good reason, but I've had a couple
of the do midnight boil offs due to control or sensor failures.  Those type
events can turn catastrophic in a hurry.

Regards - Kelly

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