Hello rogermoise, the first thing I would do is try the other filament if this is on an EI source; this should help confirm that the problem is actually with this particular filament or its wiring and not a broader electronic or other problem. If it's a CI source, it only has one filament of a different design from the EI filaments and there's a “dummy” filament that provides connections for the filament 2 wires.
The reasons for failure could be many, but among them are:
- The connection of the filament was loose when installed or grounded to the source body. Ensure that it's connected properly. Below is a wiring diagram for the feedthrough board:
- The filament was bad and indeed it failed after 2 hours; was it bought from Agilent directly?
- There's a vacuum leak in the analyzer; if you have an ion gauge, what is your vacuum level (i.e., ion gauge pressure)?
- The source might need to be cleaned.
I went ahead and flagged the “Correct Answer” on this post. If you still need help though, please let us know and we would be happy to continue working with you.