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Thread: Gas flow meter

  1. #11
    dennis13030 Guest
    These flow meters are not calibrated for HHO. I am sure there is a difference but I think it would very, very small.

  2. #12
    rzone Guest
    Quote Originally Posted by dennis13030 View Post
    These flow meters are not calibrated for HHO. I am sure there is a difference but I think it would very, very small.
    For practical purpose the error is too small to make a difference (by coincidence if you add the atomic mass of the components you'll get close enough to content of air - O2, CO2, NOx etc). The thermal error is 5-6x time bigger than this.

    For lab measuring purposes you can easily build a device similar to flow meter that you probably have in your car. It looks like this: a piece of Cro-Ni metal wire used in electrical heaters placed in a tube and powered by a constant current source. The voltage across the wire is directly proportional with lpm. Only thing you have to do is to tweak a little bit to find the linear part of the wire and calibrate it.You can also smash a light bulb and use the filament. The electronics within is trivial, and you can use a digital voltmeter to measure the output.
    If you want to play with this I'll send you drawing details and principles

  3. #13
    dennis13030 Guest
    Quote Originally Posted by rzone View Post
    For lab measuring purposes you can easily build a device similar to flow meter that you probably have in your car. It looks like this: a piece of Cro-Ni metal wire used in electrical heaters placed in a tube and powered by a constant current source. The voltage across the wire is directly proportional with lpm. Only thing you have to do is to tweak a little bit to find the linear part of the wire and calibrate it.You can also smash a light bulb and use the filament. The electronics within is trivial, and you can use a digital voltmeter to measure the output.
    If you want to play with this I'll send you drawing details and principles
    Please do send me the drawing details and principles.

  4. #14
    JonDoh Guest
    I found these for a few bucks:

    http://www.tagamed.com/tagaliter.html


  5. #15
    Join Date
    Jul 2008
    Posts
    627
    Quote Originally Posted by dennis13030 View Post
    Kinds related to this thread,

    Does anyone know of a low cost device that measures gas flow AND can be read digitally by a PC??
    Not sure about low cost, but the Dwyer website you gave earlier does have these:

    http://www.dwyer-inst.com/Products/P...m?Group_ID=369

    in case the link goes bad...

    Series GFM Gas Mass Flow Meters combine a straight tube sensor with a restrictor flow element to provide high accuracy and repeatability. Flow rates are virtually unaffected by temperature and pressure variations. Actual gas flow is displayed in engineering units on a 3-1/2 digit, 90° tiltable LCD readout. Units can be used with Series GFT Flow Totalizer for applications requiring totalization. Series GFM includes a NIST traceable certificate.

    The model GFM-2109 is rated for 0-5 LPM, is made of 316 SS, and has an RS-232 output for computer use.

    And while this is exactly what we need... I am sure it cost a pretty penny. (they don't give a price)

    Edit: Finally found the price... $947.00 Any of you rich people want to buy me one? :-)
    --
    Some days I get the sinking feeling that Orwell was an optimist!

  6. #16
    dennis13030 Guest
    Quote Originally Posted by Q-Hack! View Post
    Not sure about low cost, but the Dwyer website you gave earlier does have these:

    http://www.dwyer-inst.com/Products/P...m?Group_ID=369

    in case the link goes bad...

    Series GFM Gas Mass Flow Meters combine a straight tube sensor with a restrictor flow element to provide high accuracy and repeatability. Flow rates are virtually unaffected by temperature and pressure variations. Actual gas flow is displayed in engineering units on a 3-1/2 digit, 90° tiltable LCD readout. Units can be used with Series GFT Flow Totalizer for applications requiring totalization. Series GFM includes a NIST traceable certificate.

    The model GFM-2109 is rated for 0-5 LPM, is made of 316 SS, and has an RS-232 output for computer use.

    And while this is exactly what we need... I am sure it cost a pretty penny. (they don't give a price)

    Edit: Finally found the price... $947.00 Any of you rich people want to buy me one? :-)
    Thank you very much! This is a key item in the automated testing and optimization of HHO electrolyzers.

  7. #17
    JonDoh Guest
    Quote Originally Posted by Q-Hack! View Post
    http://www.dwyer-inst.com/Products/P...m?Group_ID=369

    The model GFM-2109 is rated for 0-5 LPM, is made of 316 SS, and has an RS-232 output for computer use.

    Finally found the price... $947.00 Any of you rich people want to buy me one? :-)
    I second that!

    Sweet unit!!

  8. #18
    fly Guest
    Well, Liter of air or Liter of HHO is still a liter of gas... So basically you have a volume per minute reading from the device.

    My thoughts on this though are a little deeper:

    Gas is easily compressed with pressure. Does those units mentioned on the links posted take pressure into account? if I have a 2 atm pressure in my line, I will basically have double the amount of molecules per volume than if I have 1 atm...

    My question really is: Is there an AFFORDABLE Measuring instrument that can tell me the exact volume at 1 atm I am producing regardless of the pressure the gas is actually flowing through it (ie, it would detect the actual presssure, then figure out what teh volume would be at 1 atm or would have a pressure gage built in to let me know what is the pressure the gas flow was registered at?

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