12
Maintaining the MS on a Daily Basis
Before Operating the Mass Spectrometer
46 TSQ Altis, Quantis, and Fortis Hardware Manual Thermo Scientific
Checking the Argon and Nitrogen Gas Supplies
Check both argon and nitrogen regulators to determine how much gas is in the tank.
For more information about gas requirements, refer to the TSQ Altis, TSQ Quantis, and
TSQ Fortis Preinstallation Requirements Guide.
Table 10. Checking argon and nitrogen gas supplies
Gas Procedure
Argon 1. Check the regulator to make sure there is sufficient gas. If necessary,
replace the tank.
2. Verify that the pressure of argon gas reaching the MS is 135 ±70 kPa
(20 ±10 psi). If necessary, adjust the pressure with the tank pressure
regulator.
Nitrogen 1. Using the regulator of the nitrogen gas tank or liquid nitrogen boil-off
tank, make sure that there is sufficient gas for the analysis.
Based on 24-hour per day operation, typical nitrogen consumption is
2800 liters per day (100 ft
3
/day). If necessary, replace the tank.
2. Verify that the pressure of nitrogen gas reaching the MS is 690 ± 140
kPa (100 ± 20 psi). If necessary, adjust the pressure with the tank
pressure regulator.
CAUTION Before you operate the MS, verify that there is sufficient nitrogen for the API
source. If you run out of nitrogen, the MS automatically turns off to prevent atmospheric
oxygen from damaging the source. If oxygen is in the source when the MS is on, the
source may be damaged. In addition, if the MS turns off during an analytical run, you
might lose data.
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