I start looking, and the cheapest way to see if the Refrigerated Air Drier is actually doing anything is going to run about $750 for the Extech monitor probe w/ display, and a power supply for it.
Or I can wait for the hoses to start spitting water - Or worse, the air ratchet or paint gun... But by then the damage has been done.
Is there a Cheap & Easy way to watch this? There are the old "Magic Eye" refrigerant sight-glasses that turn blue, but they are NOT meant for compressed air use.
Or has anyone seen one of the dew-point sensors at a surplus outlet?
Next stop after that, a molecular sieve for Nitrogen generation at 100 PSI for less than $2K. This stuff isn't Rocket Science - Wellllllll, it is, but it shouldn't be. But if they keep it obscure, they keep it expensive.
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