[3dem] Prepump airlock

[Terje Dokland]

In our case (Tecnai F20) it has always pumped for only 3 sec, as long  
as the turbo pump is already warmed up and ready. (If not, the Turbo  
warmup time f 3 mins would be added to the pumping time.) It doesn't  
seem to make any difference if you run it or not, so I'm also  
wondering what the purpose is.

On May 21, 2009, at 9:09 PM, Eduardo Sanz Garcia wrote:

> The "prepump airlock" of our Technai F30 used to pump for about ~30-60
> sec. and all the sudden it stopped working (currently only pumps for
> just 2 sec).
> How can we fix/change that? Is the "prepump airlock" function  
> totally necessary?
>
> Thank you.
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