General > General Technical Chat
Graphite dust on electronic circuits
MarkF:
Let me tell you a little story and you can decide:
Many years ago, one of my co-workers was getting a comm rack up and running. A lot of the rack consisted of opamps and TTL logic gates on PCB that plugged into a backplane. Each PCB only contained 5 or 6 chips. Anyway, my co-worker was going through the rack testing each logic gate and circling the working gates with a pencil. You guessed it! Nothing was working. Some else took over and found the pencil marks. After having all the boards cleaned and reinstalled, the comm system worked like a champ.
So... Don't circle you chips with a pencil. :-DD
True story.
jonpaul:
Bonjour, Every vacuum pump I have seen has a silencer and exhaust filter.
Yours may have a torn or expended filter or none at all.
Graphite dust can be from eroded rotaty pump seals.
The vacuum pump needs inspection and service at least for the seals and filter.
Suggest to seek professional advise or find a vacuum technology forum.
Kind Regards,
Jon
biank88:
--- Quote from: jonpaul on January 24, 2022, 09:17:34 am ---Bonjour, Every vacuum pump I have seen has a silencer and exhaust filter.
Yours may have a torn or expended filter or none at all.
Graphite dust can be from eroded rotaty pump seals.
The vacuum pump needs inspection and service at least for the seals and filter.
Suggest to seek professional advise or find a vacuum technology forum.
Kind Regards, Jon
--- End quote ---
Rotary (Carbon) Vane, aka rotary-dry-run, vacuum pump example with no exhaust filter (see the attachment).
There is only a spring loaded silencer but no particulate filter on the exhaust port.
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