4
Daily Operation
Before Operating the LTQ XL/ETD or LTQ Velos/ETD System
Thermo Scientific
MS/ETD System Getting Started Guide
27
2. Click the
Reagent
tab (
).
Figure 17.
Reagent page
3. Compare the current values of the pressures in the vacuum manifold with the following
values.
Checking the Gas Supplies
Check the two nitrogen gas supplies for the ETD module before operating the system.
To check the gas supplies
1. Check the connections to the back of the ETD module for the two nitrogen lines.
2. Verify that the pressure of the high-purity nitrogen at the MS detector is 690 ±140 kPa
(100 ±20 psi).
If necessary, adjust the pressure with the tank pressure regulator.
3. Verify that the pressure of the reagent carrier gas (ultra high-purity helium/nitrogen or
nitrogen) at the ETD module is 275 ±35 kPa (39.9 ±5 psi).
If necessary, adjust the pressure with the tank pressure regulator.
Condition
Ion gauge reading
(analyzer region)
Convectron™ gauge reading
(foreline, capillary skimmer region)
CI gas pressure set to 20 psi
20–35 × 10
–5
Torr
0.1–0.01 Torr
Note
• If the current values are higher than normal, there might be an air leak.
• If the pressure is above 40 × 10
–5
Torr in the analyzer region and the system restarted
within the last 30 to 60 minutes, wait another 30 minutes and recheck the pressure. If
the pressure decreases with time, check the pressure periodically until it is within the
typical range for the MS detector.
• If the pressure remains high, the system might have an air leak.
