If you didn't need much volume of air, you could still put in a large tank as a
reservoir. Connect it to your main system with some valves and let the main
system pressurize it, then weekends disconnect the main system from the lab and
let the pressure tank supply air for the weekend. If the reservoir wouldn't
supply air for enough length of time, you could also have a small compressor to
bring it back up to pressure, and just turn it on during break times or lunch
time.
> We went through similar here at work. We bought an oil-less pancake
> compressor to provide air to laboratory instruments when the house air was
> shut down over the weekend (GC FIDs, in case we're trying to do the same
> thing). A Tee with a couple of one-way valves was plumbed into the supply
> line for the lab. When the house air was shut off the pancake would pick up
> the slack. It was pretty slick and seemed like an elegant solution.
>
> Unfortunately, even when it was put out of the way in a crate lined with
> sound-deadening foam it was ridiculously noisy and caused a bit of a revolt.
> The final solution was to stop shutting down the house air over weekends.
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