Procedure
1. Measure the final pressure of the vacuum pump.
– after work on the system, e.g., maintenance
– before the vacuum pump is reinserted
2. Compare the measured final pressure with the test values and the specifications in the technical
data.
Prerequisites
● Vacuum pump mounted
● Vacuum pump correctly installed electrically
Required aids
● Vacuum chamber (3 liter)
● Pressure gauge
● Flushing gas nozzle (optional)
Measure the final pressure
1. Connect a vacuum chamber (volume approx. 3 l) to a vacuum connection.
2. Also connect a pressure gauge (e.g. Pirani gauge) to the vacuum chamber on the vacuum side.
3. Operate the vacuum pump with open flushing gas nozzle (if available) for at least 2 hours.
4. If unusual noises develop, immediately switch off the vacuum pump and check the position of the
clamping washers.
5. Measure the final pressure.
Comparing the ultimate pressure with the test value
1. Compare the measured ultimate pressure with the test value.
2. If the values differ significantly from the specified values after replacing the diaphragm and valve,
and if there are no changes after a run-in period, perform the following steps:
– Check the compression couplings of the connection hoses to the pump heads.
– Check the valve seats and the suction chambers.
– Repeat the ultimate pressure measurement.
Maintenance
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