backup compressor

i'm currently running nitrogen and wanting a backup compressor. need compressor to fill empty nitrogen bottle though, had this done before but completely forgot how to arrange things plumbing wise. want to run a pressure switch and a small ball valve to switch over when bottle is out. does anyone have a pic or maybe a drawn diagram of how to splice into or "t" into nitrogen line and where to put the pressure switch. thanks in advance

anyone?

Well i'm assuming you system is set up with the bottle plum'd do your valve block directly, So your going to want to put the T someplace between the bottle and valves... and have the pressure switch between the T and the compressor, and I would also run a check valve between the pressure switch and the compressor.

Should run a lil somethin like this:

Compressor > Check Valve > Pressure Switch > T fitting

But i would consider NOT having your Nitrogen bottle as an "air tank" for that single compressor, It would take that poor little compressor forever to top off that bottle just so you can get it off the ground. That compressor is for emergency use only, so i would use it for just that, emergencies... enough air to get you off the ground and get you home until you can refill your bottle.

Hope that helps man...

thanks Dougy that's exactly what I needed.