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TDC1000: TDC1000

Phani Kumar
Intellectual 260 points
Part Number: TDC1000

Hi,

I am looking at TDC1000 specs on measuring the amount of gas left in gas cylinders (cooking cylinders - i.e. LPG cylinders). Basically my requirement is to measure the "quantity" of gas available in cylinder and send the data over cloud for further data analysis. I used TDC1000 EVM and I can see it works fine with the water jug (use case mentioned in the EVM). But when I use this same thing with gas cylinder, some how I am not able to get the correct data - in fact the data is completely erratic. Is there any other flow/liquid/gas sensor to measure the content of available gas.

With best regards,

Phani.

  • 0
    TI__Genius 11015 points
    Phani,

    Please check the "TDC1000-GASEVM and TDC1000-BSTEVM Kit User’s Guide (Rev. A)" www.ti.com/.../sniu026a.pdf
    EVM for gas level measurement. Please note you will need a strong transducer that will send and receive signal from a thick metal containers for LPG gas measurements.
  • 0 in reply to Bharat Aravamudhan
    Intellectual 260 points

    Hi Bharat,

    Thanks for your email. We have  and verified it works with a glass jar (open) and can see the content if we add/ remove water to it.

    Can this be used for our application? Or do we need to buy the TDC1000-GASEVM/ TDC1000-BSTEVM (I could look at TDC1000-GASEVM/ TDC1000-BSTEVM - both looks to be same)? 

    Also you mentioned 

    Bharat Aravamudhan said:
    strong transducer that will send and receive signal from a thick metal containers for LPG gas measurements
    - do you have any suggestion for us on this transducers for this LPG cylinder application? Currently we are using SMD15T1R111WL (as seen in ). Do you suggest any other alternate part compared to this?

    With best regards,

    Phani.

  • 0 in reply to Phani Kumar
    TI__Genius 11015 points
    Phani,

    I understand that you plan to measure the liquid (LPG) level in a gas cylinder, for such a system you should be fine to even use the TDC1000-TDC7200EVM. However please experiment with attaching the transducer on the bottom of the cylinder and check if you could send & receive the echos through the metal cylinder tank. I assume that your metal tank could be thick and that could require a high power transducer to send and receive the signals. We do not have any data on transducers used in thick metal tanks at this point of time.
    In case your transducer that you plan to use needs a higher voltage than the TDC1000-TDC7200EVM you could try TDC1000-GASEVM/ TDC1000-BSTEVM since it can give a HV of 30V max to drive the transducer.
  • 0 in reply to Bharat Aravamudhan
    Intellectual 310 points

    I have seen designs where the tanks is penetrated with a sub 10 mm transducer and the circuit powered from a 3.3 volt coin battery. I also wondered why in the demonstrations no quarter wavelength matching material is used .