Pfeiffer Vacuum Hena 26, Руководство по эксплуатации

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6.7 Switching off the vacuum pump
NOTICE
Contamination from operating fluid backflow
After the vacuum pump is switched off, there is a risk that the connected vacuum system can become
contaminated by backflow. The safety valve on the vacuum pump is not suitable for longer-term seal-
ing.
► Install an additional shut-off valve in the intake line.
► Shut off the intake line immediately after switching off the vacuum pump.
NOTICE
Contamination of the vacuum chamber from operating fluid backflow
After the vacuum pump is switched off, there is a risk that the connected vacuum system can become
contaminated by backflow.
► Vent the vacuum chamber, regardless of its size, within 30 seconds.
► Shut off the intake line with an additional shut-off valve, after the vacuum pump is switched off
during longer venting operations.
Rotary vane vacuum pumps of the HenaLine have an integrated non-return valve on the suction side.
The non-return valve closes automatically when the vacuum pump is switched off, preventing the return
flow of gas and processing materials into the intake line.
Procedure
1. If required, switch the vacuum pump off in each pressure range.
2. Isolate the control input or disconnect the electronic drive unit safely from the mains.
3. Install an additional shut-off valve in the intake line to ensure that the vacuum is maintained in the
vacuum chamber.
4. Remove the mains cable and disconnect the vacuum pump from the power supply.
Operation
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