FID Detector cost to leave on all the time

I remember hearing about a big cost saving in air / hydrogen  when the 6890 came out..  There was no way to shut off the 5890 gc gaases at the end of a run. I think it was  about 5000 a year if you shut off the air / h2 / makeup gas at the end of the run.

Is there some info on this?  I think that if my coworkers can see a cost benifit they will be more likely to put an "off" method at the end of the run.  

I just know it takes me about 15 min to change a tank.  So ...


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