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Line Power, Vacuum System, Gases, and Ethernet Communication
Connecting the Gases to the MS Detector
Thermo Scientific
LTQ Series Getting Connected Guide
7
Connecting the Gases to the MS Detector
This section describes how to connect the required gases to the LTQ Series MS detector set up
for the API mode. The LTQ Series MS detector uses nitrogen for the API sheath gas, auxiliary
gas, and sweep gas, and helium for the collision gas. The gas line connections for the LTQ
Series MS detector are located on its back panel as shown in
.
Figure 4.
Back panel of the LTQ Series MS detector
To connect the gas lines, follow these procedures:
•
Connecting the Nitrogen Source
•
Connecting the Nitrogen Source
The LTQ Series MS detector requires high purity (99%) nitrogen for the API sheath gas,
auxiliary gas, and sweep gas. Because nitrogen gas usage can be quite high, Thermo Fisher
Scientific recommends one of three nitrogen sources: a large, sealed, thermally insulated
cylinder containing liquid nitrogen from which the nitrogen gas is boiled off; the largest
nitrogen cylinder that can be practically used; or a nitrogen generator. The required gas
pressure is 690 ± 140 kPa (100 ± 20 psi).
For information on modifying the nitrogen line connections inside the MALDI LTQ XL
system, contact your Thermo Fisher Scientific field service engineer. The MALDI LTQ XL
system uses nitrogen to maintain the pressure in the upper sample compartment of the
MALDI sample module.
Vacuum manifold
(connects to forepump)
Helium In
275 ± 75 kPa
(40 ± 10 psi)
Nitrogen In
650 ± 140 kPa
(100 ± 20 psi)
