Agilent Technologies 9190520 Notice De Mode D'emploi page 60

5 Technical Information
Bakeout
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To restart the discharge, tap the pump body with a penny held
between the thumb and forefinger, or heat the pump body locally
with a small soldering iron. This should liberate surface gas
within the pump and restart the discharge. NEVER strike the
pump with hand tools.
If the magnet strength is below its rated level, the pump
discharge and speed will be reduced and the discharge may
extinguish at a pressure below 1 x 10
-7
mbar.
2 l/s Ion Pump User Manual / 87-900-091-01 (E)