Agilent Technologies UHV-24, Инструкция по эксплуатации

Страница: 18 / 28

UHV-24/UHV-24p Ionization Gauge
18
DRAF
T
Thoria-Coated Iridium Filament Replacement
This replacement filament kit (Part No. 9710028) contains two thoria-coated iridium
filaments stapled to a cardboard backing and packed in a foam-lined plastic box. Each
filament also has a stabilizing bar soldered to the base of the filament for rigidity.
To remove and change the damaged filament:
1. Carefully loosen all six set screws and pull the old filament support brackets out.
CAUTION
Handle the gauge only by its ceramic base to prevent damage
to the delicate wires. Wear nylon gloves to prevent placing
fingerprints on the gauge. The oil from fingerprints extends
pumpdown time.
2. Carefully remove the stabilizing bar by very carefully cutting between the posts of the
thoria-coated iridium filaments.
3. Cut the staples affixing the assembly to the cardboard backing.
4. Insert the long filament support bracket into its collar so that the filament is located
0.050 to 0.070" from the grid structure.
5. Tighten the set screws.
6. Insert the short filament support brackets into their collars, pushing them in as far as they
will go before tightening the set screws. This ensures proper tension on the filament.
7. Carefully trim the remainder of the stabilizing bar from each filament post.