G4000 Medical Gas Outlet Analyzer

  • Sunday, October 24, 2021 10:07 AM
    Message # 11864972

    Does this system test to NFPA 99 code requirements ?

  • Monday, October 25, 2021 12:58 PM
    Reply # 11919722 on 11864972


    This unit can meet some of the testing requirements of NFPA 99.

    I believe the manufacturer markets this for existing facilities, that perform ongoing periodic testing of their outlets/inlets.

    This unit has limitations.

    To my knowledge, it can test operational flow, and gas concentration.

    At one time I had heard that it only utilized an oxygen analyzer, so it could not test gas concentration for nitrous oxide and carbon dioxide. This may have changed with newer models. I have not seen one recently.

    Knowing its limitations, will help you understand if it meets NFPA 99 code requirements or not.

  • Tuesday, October 26, 2021 8:34 AM
    Reply # 11960001 on 11864972


    We have a G2000 and a G4000. I agree with everything Bob said in his response and have the additional comment. Years ago, I asked the manufacturer "How does the unit test for N2O?" and I was told that it was proprietary technology. Not convinced, I set up a shop test using the N2O adapter and plugged it into 50 psi N2, and the unit told me I was seeing N2O. When I drove the N2 pressure up to 175psi, it responded that I was testing N2. I found that odd!

  • Wednesday, October 27, 2021 7:51 AM
    Reply # 12013319 on 11864972

    Sounds like it uses a "Facebook" algorithm to differentiate.  First O2% (probably >95% = O2, <95% = other gas).  Then, it looks at system pressure (which is why it went from N2O to N2 when you increased pressure).  The question is how does it differentiate between N2O and CO2???  Since it is for "annual / existing facility" testing, it must assume that no cross connections exist (since it should have been previously verified).  If they can't tell you how the technology works, it is suspect out of the box...in my humble opinion!  We should be able to validate its function in order to make sure our testing procedures address any potential equipment constraints.

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