Max300-LG : Description - Specifications - Installation Guide
Extrel
Core Mass Spectrometers
Page 28
poles, avoiding scrubbing in a longitudinal direction. It is very important to avoid
scratching the quadrupoles.
When the deposits have been removed, the quadrupole will require a general overall
scrubbing using the pumice/alconox paste. Use a brush of 3/4 to 1 inch diameter inserted
along the axis of the assembly. This brush should have the wire knot at the end removed
and the handle covered in plastic. Clean the inside of the quad by rotating the brush.
Rinse the assembly thoroughly in tap water followed by distilled water. Watch for the
formation of a uniform, continuous film of water. Formation of individual droplets
indicates the presence of a hydrocarbon film and will require the assembly to be cleaned
again. When cleaning is completed, dry completely with an oven or hair dryer and place
on a clean Kimwipe for reassembly.
Quadrupole Reassembly and Vacuum Chamber Installation
Required Tools
• (1) 5/64" Hex Wrench
• (1) Pair Lint Free or Nylon Gloves
• (1) New 3 3/8" Copper Gasket
• (1) New 4-1/2" Copper Gasket
• (1) 1/4" Hex Key
• (1) 1/8” Flat Blade Screwdriver
With the quadrupole cleaned, the collar shield assembly will be re-attached and the quad
installed into the vacuum system. An ohmmeter will verify that nothing is shorted to
ground before the system is pumped back down.
To re-attach the collar shield assembly, slide the detector end plate with the rods attached
into the quadrupole from the detector end. The locating pins must fit into the holes of the
ceramic mounting collars as shown in Figure 20 below.
Use the four 2-56 pan head screws to attach the ionizer end plate to the free ends of the
shield rods at the ionizer end of the quad. Be sure to orient this plate properly. The
recessed area faces outward and the threaded hole in the edge is aligned with the pair of
holes in one of the corners of the ceramic collar.
To Next Page
Loading...