Thermo Finnigan LTQ - Shutting down the System Completely

System Shutdown, Startup, and Reset
Shutting Down the System Completely
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 'JOOJHBO-52
5IFSNP
&-&$530/$03103"5*0/
5-4 _______________________ Finnigan LTQ Hardware Manual _______________________
5.3 Shutting Down the System
Completely
The LTQ system does not need to be shut down completely if you are not
going to use it for a short period of time, such as overnight or over weekends.
(Refer to the topic Placing the System in Standby Condition, above.) Shut
down the system completely only if it is to be unused for an extended period
or if it must be shut down for a maintenance or service procedure.
Use the following procedure to shut down the LTQ system completely:
1. Turn off the flow of sample solution from the LC (or other sample
introduction device).
2. From the Tune Plus window, choose Control > Standby (or click on the
On/Standby button) to put the MS detector in Standby. When you place
the MS detector in Standby mode, LTQ turns off the electron multiplier,
conversion dynode, 8 kV power to the API source, main RF voltage, and
octapole RF voltage, sheath and auxiliary gasses.
3. Place the electronics service switch, located on the power panel (see
Figure 5-1 on page 5-2), in the Service position. Power to the
non-vacuum system electronics is turned off when you place the
electronics service switch in the Service position.
4. Place the main power circuit breaker switch, located on the power panel
(Figure 5-1) in the Off (O) position. When you place the main power
circuit breaker switch in the Off (O) position, the following occurs:
• All power to the MS detector, including the turbomolecular pump and
rotary vane pump, is turned off. (All LEDs on the front panel of the
MS detector are off.)
• The battery backup on the Vent Delay PCB provides power to the
vent valve for 30 s. After 30 s, a circuit on the Vent Delay PCB times
out, and power to the vent valve solenoid is shut off. When power to
the vent valve solenoid is shut off, the vent valve opens and the
vacuum manifold is vented to filtered air. You can hear a hissing
sound as the air passes through the air filter.
• After about 2 min, the vacuum manifold is at atmospheric pressure.
5. Unplug the power cord for the MS detector.
Note. For instructions on how to operate the LC from the front panel, refer
to the manual that came with the LC.
CAUTION. Allow heated components to cool before servicing them.