Startup & Shutdown
Shutdown
Thermo Fisher Scientific
Prima PRO & Sentinel PRO Mass Spectrometers User Guide
7-11
Trap Current: Within the range 10 µA to 100 µA.
Source Current: Within 2 to 15 times the value of Trap
Current.
Repeller Voltage: Normally within the range of 0 V to 10 V.
Power Tab
Magnet Current: With 1000 V ion energy for any mass, the
magnet current is given approximately by 2.3 x (mass/28)
0.5
.
The shutdown procedure will vary slightly depending on application
and on what the system is doing at the time of shutdown.
In general, it is better to leave the instrument running rather than
repeatedly shutting down for periods of inactivity. This is true even if
the instrument will be unused for several weeks. However,
shutdowns will be required for routine maintenance, etc.
(later in this chapter) should
also be followed in the event of a power failure.
The following steps should be carried out in sequence.
1.
Shut off all sample gas flows.
When the system shuts down, all the heaters will go off and gas
handling parts of the system will begin to cool. Where there is a
risk of residual sample gases condensing, it is recommended that
the inlet system be purged with a suitable inert gas such as
nitrogen before power is removed.
2.
Switch OFF the filament on the Emission tab of the Control
Centre software.
3.
Switch the TURBO RUN micro switch to OFF (OFF = switch
UP).
4.
Disconnect GasWorks software with the
icon.
5.
Switch OFF the Mains Electrical ISOLATOR (see
earlier in this chapter) to de-energize the system electronics.
Isolate power externally to fully de-energize the system.
Shutdown
Introduction
Shutdown
Procedure
