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vacuum pressure vs ventury

vacuum pressure vs ventury

vacuum pressure vs ventury

(OP)
Hi Guys,

I am working on a WDG-4C Ametek Flue Gas Analyzer. This analyzer uses an apirator to pull a sample from a process(process is at a vacuum pressure), where this sample then passes by a combustibles detector followed by a O2 cell then returns to the process through the exhaust probe.  Now my question is, if the vacuum pressure(its a high vacuum but no one can tell me the exact measurement) is the same on both the exhaust and inlet probe, will my aspirator be able to pull a sample regardless of how high the process pressure is.  My aspirator is not strong, but was told if the pressure is the same on the exhaust and inlet probe, the aspirator will add just enough of a change in pressure that it will allow for the process to flow through the analyzer.  Is this correct?    

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