2000 MS Hardware Maintenance
88
Mass Spectrometer Maintenance
Diffusion Pump Compartment
A Thermocouple Gauge
E Exhaust Clamp
B Elbow
F Diffusion Pump Controller
(behind cover)
C Pneumatics
Exhaust
Tube
G Inlet Clamp
D Diffusion Pump
H Fan
Turning Off the Diffusion Pumped Mass Spectrometer
WARNING:
BURN HAZARD
Allow diffusion pump and other heated zones to cool before disassembly.
To turn off the MS:
1. Invoke Saturn shutdown tab from System Control and click on shutdown.
See section on system Start-up and Shutdown.
CAUTION
Do not attempt to vent the MS by any other means. Venting through the
foreline connections or transfer line will cause a rapid pressure increase that
will coat the ion trap and internal surfaces of the manifold with diffusion pump
fluid. A transfer line venting will also cause high mass noise in the trap.
2. Maintenance work may begin once the vacuum system has vented to
atmospheric pressure. This takes approximately five minutes.
•
This may be checked by placing a finger over the vent port to feel for
suction.
