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If you are just testing to see if the pump pulls down by evacuating, for example, a gauge manifold, the pump should be able to pull all the way down to 50 microns.
As we had discussed a while back, Mike, changing the oil prior to testing is a good thing to do, especially if, as another tech noted, there is only one pump being used for 5 technicians. One never knows when the last oil change was done.
As a quick service note, guys, be sure to replace the vacuum pump BEFORE each use, not after. Moisture-laden oil will reduce the pumping capacity of the unit.
You guys ahould also check out the new APPION vacuum pumps. They feature a 5-second oil change as the oil comes in easy-to-remove, easy-to-replace cartridges.
Check them out at www.appioninc.com