4.3 Switching Off/Shutting Down
Close the intake line
Switch the pump off
The pressure in a pump which has been switched off will increase within a
few seconds to the level of the discharge pressure (normally = ambient pres-
sure). The SP 250 is not equipped with any means to protect the vacuum.
For this reason use, if needed, a valve (anti-suckback valve) fitted in the
intake line which will automatically close the intake port of the pump upon
standstill of the pump (for example, SECUVAC valve.
In order to prevent damage due to standstill of the pump, a post operation
phase of at least 15 minutes with the gas ballast open is recommended
after termination of the process, if the process gas contains corrosive, con-
densable substances or substances which tend to form deposits.
In the case of prolonged standstill times (over three weeks) further mea-
sures besides letting the pump run idle need to be introduced for the pur-
pose of avoiding corrosion due to standstill, see Section 2 “Storing”.
For this please contact Leybold for advice.
Depending on the pump version switch off
■
power supply for the SP-Guard
■
gas ballast
■
purge gas
NOTICE
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