The regulator should be operating, and the cutoff valve should be open. Start the vacuum pump. Check the vacuum level on the meter or the mercury column and compare with the gauge on the system. Record your results on the accompanying form. Follow the manufacturer's suggestions or consider operating vacuum levels as listed below.
Vacuum pump capacity.
The cutoff valve is opened and the regulator removed or closed, with pulsation disconnected. In some cases, however, significant losses could be due to pipe size restrictions. It may not be possible to disconnect all types of pulsation systems. Place the pulsators and units in the operating position. The difference between this reading and the reading in step 3 is unit consumption.