Reviving a shelved project here. I had bought a secondhand pump and vacuum gauge, and am now beginning to test them against one another.
Pump: Robinair 15400
Gauge: Robinair 14830A
Connecting the gauge directly with a single hose to the tee on the pump, with the other leg of the tee capped. Fresh vacuum pump oil at correct level. Pump allowed to run for a minute isolated from the hose to warm the oil.
Opening the isolation valve on the pump pulls an immediate vacuum at the gauge, and the gauge shows a quick drop to a sub-50 micron level. It will hold that vacuum for as long as I leave the isolation valve open.
But when I shut the isolation valve, the vacuum immediately begins to bleed off, and pretty quickly. In less than a minute, it's back up to the 2500 micron level. Tried two different hoses. Identical result.
I assume that I need to be thinking about either overhauling the seals in the pump, or just buying a new pump, correct?
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