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Based on Jenne's chiara disk usage monitoring script, I made a script that checks the N2 pressure, which will send an email to myself, Jenne, Rana, Koji, and Steve, should the pressure fall below 60psi. I also updated the chiara disk checking script to work on the new Nodus setup. I tested the two, only emailing myself, and they appear to work as expected.
The scripts are committed to the svn. Nodus' crontab now includes these two scripts, as well as the crontab backup script. (It occurs to me that the crontab backup script could be a little smarter, only backing it up if a change is made, but the archive is only a few MB, so it's probably not so important...)
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This watch script gives little time to replace N2 cylinder. When the regulated supply drops below 60 psi the cylinder pressure is 60 psi too.
It is more of a statement that V1 is closed and act accordingly. It's only practical if you are in the lab.
Rana pointed it out correctly that we need this message 24 hrs before it happens. This requires monitoring of total supplies , not the regulated one.
So we need pressure transducers on each nitrogen cylinder, before the regulator. The sum of the two N2 cylinder when they are full 4000 - 4500 psi
The first email should be send out at 1000 psi as sum of the two cylinders. This means that you have 1 day to replace nitrogen cylinder.
Most of the time the daily consumption is 750 +-50 psi
However sometimes this variation goes up ~750 +-150 psi |