Placing The Mass Spectrometer In Standby Mode - Thermo Scientific LTQ Series Hardware Manual

Placing the Mass Spectrometer in Standby Mode

On Standby
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You do not need to shut down the LTQ Series mass spectrometer completely if you are not
going to use it for 12 hours or more. Instead, place the mass spectrometer in standby mode.
 To place the mass spectrometer in Standby mode
1. Complete all data acquisition, if any.
2. Open the Tune Plus window (see
3. If an LC pump is provided, turn off the solvent flow to the API source.
When controlling the LC pump through the Xcalibur data system, you can turn off the
solvent flow from the Inlet Direct Control dialog box. For example, to turn off the solvent
flow from an Accela™ pump, do the following:
a. Choose Setup > Inlet Direct Control, and then click the tab for the LC pump.
b. Select the Take Pump Under Control check box, and then click the Stop button.
4. In the Tune Plus window, do one of the following:
• If the mass spectrometer is off, choose Control > Standby.
–or–
• If the mass spectrometer is on, click the On/Standby button to select the Standby
mode.
When clicked, this button cycles through the power modes shown in the left margin.
The LC/MS system is now in standby mode and you can safely remove the ion source probe
or API source housing after it has cooled to room temperature. For instructions, refer to
Chapter 2, "Setting Up the API Source," in the LTQ Series Getting Started Guide.
CAUTION If you are using APPI, do not leave the LC or other liquid delivery device on
while the mass spectrometer is in standby mode. The absence of sheath and auxiliary gas
can cause the hot VUV vacuum lamp to break upon contact with liquids.
The mass spectrometer turns off the electron multipliers, conversion dynodes, 8 kV power to
the API source, main rf voltage, and ion optic rf voltages. The mass spectrometer also turns
off the sheath, auxiliary, and sweep gas flows.
Note For LTQ Series 2.7 SP1 or later, when you place the mass spectrometer in standby
mode, the sweep gas flow remains on to help clean out the API source.
See Table 5 on page 42 for the On/Off status of the mass spectrometer components when the
mass spectrometer is in standby mode. The System LED on the front panel
page 13) turns yellow when the system is in standby mode.
3
System Shutdown, Startup, and Reset
Placing the Mass Spectrometer in Standby Mode
page 34).
(Figure 7 on
LTQ Series Hardware Manual 35