INFICON HAPSITE ER Chemical Identification System - Manual (Page 517)

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HAPSITE ER Operating Manual
18 Tighten the three securing screws with the screw driver. Tighten them
alternately and gently to ensure that the ionizer is installed straight.
NOTE: As you install and tighten the ionizer, make sure the extension tube
remains positioned in the ion volume and is lined up with the
membrane isolation valve.
19 With the forked end of the ionizer removal tool, grab the extension tube and
slide the extension tube into the membrane isolation valve so the extension
tube is not protruding into the ion volume.
20 Install a new NEG Pump or reinstall the old NEG Pump with a new aluminum
sealing ring. Perform the activation process or put the blank off flange with
o-ring on the manifold.
NOTE: See section 16.7.4, Part 3: Install the New NEG Pump, on page 16-24
through section 16.7.6, Part 5: Activation of the NEG Pump, on page
16-34 for detailed information regarding NEG Pump installation.
16.9 Replacing the HSS Needle
Replacement of the needle in the HSS needle assembly should be performed on
an as needed basis. The needle will need to be replaced if it is significantly
deformed, if it is broken, if the point becomes blunted, or if the holes become
plugged with debris.
Tools Required
 A No. 2 Phillips screwdriver.
 1/4" open end wrench or equivalent.
WARNING
The needle tips are sharp. Be careful to avoid injury.
WARNING
Be careful to avoid burns if the surfaces are still hot.
Procedure
1 Open the top yellow cover of the HSS to expose the needle assembly.
2 Using the Phillips screwdriver, loosen and remove the two screws on top of the
assembly.