I've got a 7 year old MES-DEA vacuum pump that no longer shuts completely
off. After pumping down, the pump begins to quit, but then starts/stops
rapidly, sounding like the lope of an idling (very quiet) race car engine.
I checked for vacuum leaks, disconnected and plugged various hose ends,
and finally plugged the end of the pump with my finger. In all cases, the
pump would stutter after reaching its preset vacuum level.
Now for the big question: Do I leave it the way it is? Or do I put the
pump into its "continuous run" mode? My thought is that running constantly
would be better than the constant start/stop, which is probably stressful
to the motor and its drive electronics. This particular model has a
built-in pressure sensor that gets bypassed if the polarity of the pump
connections are reversed.
Ideas?
Adrian
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