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Mass Spectrometer Maintenance
Check Ion Trap Operation
To check the ion trap operation, proceed as follows:
1. Once bake out is finished, re-establish the analysis temperature in the trap
for at least 2 hours to achieve thermal equilibrium.
•
The manifold temperature should be below 50 °C.
2. Run
Diagnostics.
3. Run Auto Tune or manually tune spectrometer.
Fill the Calibration Compound Vial
The calibration compound used with the Saturn GC/MS is perfluorotributylamine
(PFTBA; C
12
F
27
N). This compound is also known as fluorocarbon-43 (FC-43).
NOTE: There is no need to vent the vacuum system before you fill the cal gas
vial with calibration compound, provided the cal gas needle valve is closed. To
close the cal gas needle valve, turn it clockwise.
To fill the cal gas vial, proceed as follows:
1. Loosen each of the four retaining screws about 3 turns with a Phillips
screwdriver. The four screws are located on the top of the pneumatics
manifold.
2. Pull the cal gas vial down gently with a slight twisting motion until it clears the
pneumatics manifold.
3. Refill the vial using a Pasteur pipette until the vial is filled about 1/3 full with
PFTBA compound (03-920353-00).
4. Remove any liquid that remains in the neck of the vial with a lint-free paper
tissue.
5. While holding the vial vertically, carefully push the vial into the cal gas port on
the manifold with a slight twisting motion.
6. After you have pushed the vial in as far as it will go, tighten the four retaining
screws.
7. Open the cal gas needle valve 10 counterclockwise turns. Leave the needle
valve open for at least 30 minutes. Any excess cal gas and water vapor will
be pumped away.
8. Bring up System Control, and select Adjust Cal Gas Pressure under
Adjustments in the menu bar.
9. Adjust the cal gal pressure, according to the instructions on the screen.
