Ametek Dycor Dymaxion Mass Spectrometer, User Manual

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6-4 | Dycor Dymaxion Mass Spectrometer
Closed Source
The Dycor conductance limited/enclosed source contains a dual-wire filament
so the analyzer can continue to function if one side of the filament burns out.
The replacement filament comes in a protective container and can easily be
replaced in the field.
•
The filament should be replaced soon after its resistance exceeds 1.5
ohms or when it is determined to be half-open (filament LED is yellow).
•
If the analyzer is vented to air repeatedly while the filament is on, the
filament can burn out and yttrium oxide and iridium debris will cover
the source components.
Before changing the filament, you must remove the Dymaxion electronics from
the quadrupole head and remove the quadrupole head from the vacuum system.
The Dymaxion power must be turned off before servicing.
Equipment required to replace a filament
• needle nose pliers,
• 5/64” hex wrench (supplied by AMETEK/Dycor),
• filament assembly kit (supplied by AMETEK/Dycor),
• latex gloves - powder-free (optional).
Handling the filament by the shorting tabs on the filament plate will
ensure against contamination through handling since these tabs will
eventually be discarded.
Removing the Dymaxion electronics
Always remove 24 VDC power from the Dymaxion electronics before remov-
ing the electronics from the sensor.

After powering down the Dymaxion, carefully use the tightening knobs
on the sides of the Dymaxion to unlock the electronics from the qua-
drupole head.

Once loosened, gently pull straight back on the Dymaxion, without
twisting, until it is free of the head. Do not remove the cabling from the
Dymaxion electronics.
NOTE
