18
Operation
6.4 Switching off
The pump can be switched off in any pressure range.
Rotary vane pumps have an integrated safety valve on the intake side. If the differ-
ential pressure between the exhaust side and the intake side is
≥
250 mbar, then
the valve closes automatically and vents the pump when the pump is switched off.
Switch-off pump by disconnecting from mains or via remote bypass50.2.
Venting the vacuum
chamber
Maintaining the va-
cuum in the chamber
CAUTION
Danger of backflow of operating fluid into the intake line!
Contamination of the connected vacuum system!
Vent the vacuum chamber within 30 s, regardless of the chamber size.
For a longer venting process, use an additional shut-off valve and shut off the intake
line after switching off the pump.
CAUTION
Danger of backflow of operating fluid into the intake line!
Contamination of the connected vacuum system!
Because the safety valve of the pump is not suitable for longer-term sealing, install
an additional shut-off valve in the intake line.
Shut off the intake line immediately after switching off the pump.
