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Does TI have an Application design for an Electromagnetic Water Flow Meter?

Prodigy 45 points

Replies: 13

Views: 4740

Checking with the experts on if there is a reference design for an Electromagnetic Water Flow Meter.

These are also known as Magmeters.

A magnetic field is created using motor type circuit and when energized the voltage is measured across the interior of the flow meter body.

The voltage is measured in on both cycles of the fields as they alternate and when combined and divided by 2 much of the line noise is removed.

These flowmeters are highly accurate.

If there isn't a public application then are TI resources available for a private design?

  • Hello Robert,

      Yes, there is a Ref Design: www.ti.com/tool/tidm-3lc-meter-conv .

    Note that this is a basis for a design, TI does not provide product design services, however there is a third-party design network: http://www.ti.com/devnet/docs/catalog/searchcatalog.tsp .

    ~Leonard 

  • In reply to LeonardEllis:

    Thanks for the quick response.
    The design you sent me is for a disc/pulse counting register.
    A Magmeter circuit powers copper coils which generate a magnetic filed, much like a motor except the coils are on a water pipe with flow water inside. There are 2 wet electrodes that the electronics must read which are voltages in the millivolts. The voltage produced is proportional to the velocity of the fluid. So from what I just stated there are 2 parts of this circuit, a coil driver and an analog voltage input.
    ?
  • In reply to Robert Pinkerton:

    Hi Robert,

    Apologies for that oversight, and while I explore this further, let me show you also an ultrasonic version for gas or water: http://www.ti.com/tool/TIDM-ULTRASONIC-FLOW-TDC .  Just FYI, there may be some things you can use in this design.

    ~Leonard

  • In reply to Robert Pinkerton:

    I also found this App Note, seems to be what you are requesting, but it is 5 years old, I will have to pursue what happened with the development: www.ti.com/lit/an/slyt471/slyt471.pdf .

    ~Leonard

    added:  also, this Ref Design: http://www.ti.com/tool/TIDM-LC-WATERMTR

  • In reply to Robert Pinkerton:

    Hi Robert

    Yes there are two parts in magmeters, one is excitation and another is detection. you can excite it by different types of signals like alternating ac signal , square wave , biphasic waves as per your application.

    The detection of flow will be very low voltages you can say it a noisy signal.

    it must be perpendicular from the excitation coils.....

  • In reply to Unobtainium:

    Thanks. I understand very well how MagMeters work. The inquiry was in regard to Analog Devices design samples of which there is a circuit for a MagMeter. In reviewing the article and video it noted that the full schematic and design files were available upon request. We're interested in seeing what is available.

  • In reply to Robert Pinkerton:

    Robert,

     Your last post was the first time you mentioned a Reference Design; your initial inquiry was whether TI has such a design.  Your latest post specifies an Analog Devices design, of which TI would have no reference to.

    If you would like to continue developing a Ref Design using TI devices, we will be happy to work with you; if, however, you wish to pursue the ADI design, please contact ADI directly.

    At your service,

    ~Leonard   

  • In reply to LeonardEllis:

    Whoops sorry about that. I was definitely trying to see what TI has as far a designs for MagMeter electronics. I noted AI because they have an application note on their site.
  • In reply to Robert Pinkerton:

    Hi Robert,

      I've had to say 'oops' many times myself, I certainly understand, especially when doing research.   I read that ADI App Note, they had some detailed designs for sure.  

    So, back to the TI design, I'm wondering if the WATERMTR Ref Design was close to what you might want? www.ti.com/tool/TIDM-LC-WATERMTR .  As you'll note, the flowmeter sensor is already included in this design, and even though the WATERMTR page says the board is not for sale, you can get one with the MSP430 Dev Kit: www.ti.com/tool/EVM430-FR6989 .  Fully assembled, ready to go, with all sorts of support for code and development.

    Would this match your meter design requirements?  Or are your required to use a specific sensor?  If so, please send the details on that sensor (part number and manufacturer).

    ~Leonard 

     

  • In reply to Robert Pinkerton:

    Hi Robert,

      Had not heard back from you, so I wanted to check to see where you are with this design.  Did you decide to use the ADI device?  Any feedback WRT the Ref Designs I highlighted?  Let me know if there is any other info I can provide, and the status.

    ~Leonard 

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