[labnetwork] UPS for high-vac tools

[Jasper Nijdam]

> You CANNOT assume someone is available to shut things down. Maybe it's at
> night, maybe it's an electrical fire and the building is evacuated.  You
> don't want to shutdown on short glitch (1 second while upstream gear
> switches) though.
>

This is actually a key consideration. Do you need to run your equipment for
a long time because there's no other backup at all, or do you just need to
get over the short period until your institution's emergency power kicks
in?

Here at Georgetown we have several power blips a year, and during hot
Summer days when all the aircos in DC are straining PEPCO's supply, they
will disconnect campus from their network. But our campus emergency power
generators kick in within 7s (says facilities), and our on campus power
station can keep us running for a while. So our SEM only needs to get over
that few second blip. Our mechanical pumps handle that blip with surprising
ease.

But being prepared to run your entire lab for several hours in the middle
of the night/blizzard/sharknado without other backups is a very different
game.

Yours,

-- 
Jasper Nijdam
Technical Manager GNuLab, Georgetown University
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