Shut down the MS completely for planned maintenance, service, or for long-term storage.

NOTE

Thermo Fisher Scientific does not recommend shutting down the MS completely during long periods when it is not in use. Keep the system under vacuum to maintain the system functionality, if possible.

The following figure shows the power module located on the right side of the MS with the Electronics switch in the Service Mode position and the Main Power switch in the Off position.

Figure Power module

Prerequisites

  1. Turn off liquid flow from the LC (or other sample introduction device), as applicable.

Procedure

  1. In the Tune application, select System Standby to place the MS in Standby mode.
  2. The icon changes from white to green and the System LED on the front panel of the MS turns yellow.
  3. Place the Electronics switch in the Service Mode position.
  4. The Service Mode turns off all LEDs on the front panel and the power to the non-vacuum system electronics.
  5. Turn off the Main Power switch.
  6. The following occurs:
  7. All power to the MS, including the turbomolecular pumps, turns off. In addition, the forepump turns off.
  8. After approximately 60 seconds, power to the vent valve solenoid shuts off, the vent valve opens, and the vacuum manifold vents with filtered air. You might hear a hissing sound.
  9. After approximately 5 minutes, the vacuum manifold is at atmospheric pressure.
  10. Unplug the MS's power cord from the electrical outlet.

  11. CAUTION

    Do not disconnect the power cord from the MS while the other end is still plugged into the electrical outlet to avoid high voltages in the power cord.

  12. (Optional) Close the helium and nitrogen gas supply lines.

  13. NOTE

    If you only plan to perform routine or preventive maintenance on the MS, you do not need to turn off the gases, the LC, the autosampler, and data system.