Figure 60. Ion Sweep Cones - Thermo Scientific LTQ Series Hardware Manual

Thermo Scientific
2. Turn off the nonvacuum system voltages by placing the mass spectrometer's electronics
service switch in the Service Mode (down) position. The service switch is located on the
right side of the instrument.
CAUTION Make sure that the electronics service switch is in the Service Mode (down)
position before proceeding.
CAUTION HOT SURFACE The ion transfer tube operates above 250 °C (482 °F).
Allow the ion sweep cone and ion transfer tube to cool to room temperature
(approximately 20 minutes) before touching them.
3. After cooling to room temperature, remove the API source housing from the front of the
mass spectrometer.
For instructions, refer to Chapter 2, "Setting Up the API Source," in the LTQ Series
Getting Started Guide.
4. Grasp the outer ridges of the ion sweep cone and pull it off of the API cone seal. If
necessary, first loosen the ball plungers by using a small slotted screwdriver.
Figure 60 shows the two types of ion sweep cones available on the LTQ Series mass
spectrometers. The ion sweep cone shown on the bottom has an offset orifice.

Figure 60. Ion sweep cones

Gas inlets
Ion Source Interface Maintenance
Offset orifice
LTQ Series Hardware Manual
5
Maintenance
87