Models 947, 948 and 960 Leak Detectors Operations and Service Manual
B-13
3. Before re-using O-rings or installing new O-rings, wipe them down with a lint-free cloth
to ensure that no foreign matter is present to impair the seal.
CAUTION
Remove O-rings carefully with your fingers. Do not use metal
tools for this task. This prevents scratching of any sealing
surfaces.
Do not use grease or other substances on the O-rings that come
in contact with the spectrometer tube.
Do not use alcohol, methanol, or other solvents on O-rings. To
do so causes deterioration and reduces their ability to hold a
vacuum.
4. Place the O-rings on the centering rings.
5. Using a VacuSolv wipe, clean the SVBA at its connection point to the turbo pump.
6. Allow all parts to air dry thoroughly.
B.3.1.2.2 Connecting the Turbo Pump to the SVBA
To perform this procedure:
1. Place the O-ring on the ISO50 centering ring.
2. Place the centering ring against the top of the turbo pump.
3. Hold the turbo pump against the SVBA oriented so that the flange for the foreline
connection is in line with the foreline.
4. While supporting the pump with one hand, place the four ISO single claw clamps onto
the corners of the SVBA (Figure B-9 on page B-11), insert the bolts, and then tighten
them just enough to hold the pump.
5. If the foreline was removed from the upper foreline connection (Figure B-7 on
page B-10), do the following:
a. Place the centering ring and O-ring against the flange of the flexible coupling.
b. Orient the curved foreline so that the shorter leg is up and the longer leg is in line
with the flange on the turbo pump.
c. Place the upper end of the foreline against the upper foreline connection centering
ring and O-ring.
d. Place the NW25 clamp around the centering ring and O-ring and tighten the
wingnut fully.
6. Place the O-ring and centering ring against the foreline flange on the turbo pump.
Summary of Contents for 948
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