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Dilution flow

  1. Feb 2, 2010 #1
    I want to measure certain gases in a nitrogen stream, but I have to dilute with nitrogen flow, which is flowed at a much higher rate for a photo-ionizing detector.

    However, I am getting backflow into the low flow stream. I tried adding a various mixing chambers of increasing size as the PID pumps the air as well; I was hoping that would work.

    Are they any special valves to prevent it?

    I know SEM's have pressure limiting apertures, but those seem pretty sophisticated.

    I would think there is something standard as this is probably done a lot.
     
  2. jcsd
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