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Model 979 Helium Mass Spectrometer Leak Detector
4.2.1 Removing the Valve Block Coil and Plunger Assembly
To remove the Valve Block Coil and Plunger Assembly:
1. Disconnect the mains power supply and make sure all pumps are off.
2. Open the front and rear panels (Figure 4-2) as described in Section 3.1 "Opening the
Front Panel".
4-2
Disconnect power from the 979 before performing any
WARNING
procedure that requires physically disconnecting any part of the
system.
Figure 4-2 979 Side View
Use powder-free butyl or polycarbonate gloves to prevent skin
CAUTION
oils from getting on vacuum surfaces.
Internal
Calibrated Leak
End Cap
Valve Stem
Valve Block
Coil & Plunger
Assembly
Valve Power Connections
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