[time-nuts] Re: hydrogen rich environment and oscillators

[Lux, Jim]

On 12/12/22 7:09 AM, Poul-Henning Kamp wrote:
> --------
> Lux, Jim via time-nuts writes:
>
>> Does anyone have any information on what happens to hermetic TCXOs when
>> they're in a hydrogen rich atmosphere?
> What kind of hydrogen concentration are we talking about ?
>
Unknown - I'm looking at "if you've got a cubesat mounted on a big 
rocket that uses LH2, and they go through various and sundry tanking and 
detanking exercises, what might happen"Â Â  In the long term sense, 
probably not a high concentration, but I could see there being times 
(hours?) when there's a very high concentration.  I mean, they have 
those brooms to probe for hydrogen flames for a reason.

There are cases where people think that a sensor was "poisoned" by He 
(but never confirmed) because it was stored in a He-rich (but no where 
near pure He) environment.  ISS has this problem - the atmosphere is 
fairly rich in He, because they backfill the supply ships with He, so 
when they open the hatch, a big blob of He moves into the station. (why 
they don't use N2, I have no idea.. Maybe they are using He sniffers 
after bolting the hatches or something)