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TDC1000: Ultrasonic Flow Meter design

Purvik Patel
Prodigy 90 points
Part Number: TDC1000
Other Parts Discussed in Thread: TDC7200, MSP430FR6043

I want to make ultrasonic flow meter using TDC1000 and TDC7200, Please provide a schematic diagram.

Is it work in high flow range like 500 LPM or More ?

  • +1
    TI__Mastermind 23045 points

    Hello Purvik,

    Thanks for posting to the sensing forum! The TDC1000 and TDC7200 are not the recommended devices for flow metering due to a bug in the device which reduces the accuracy of the measurements. The recommend device for flow metering is the MSP430FR6043 since it can achieve a higher accuracy.

    I am not sure what the flow limitations are on the MSP430FR6043 so it might be useful to check the documentation for that device or make a new post regarding the MSP device to get an engineer that services that device to review your questions.

    Best,

    Isaac

  • 0
    Prodigy 40 points

    Isaac, could you please provide some details about that bug? Is there an errata sheet?

  • 0 in reply to Peter Kahn
    TI__Mastermind 23045 points

    Hello Peter,

    Unfortunately there is no errata sheet for this error. You can find some more info on the TDC1000 FAQ linked here.

    To summarize the issue, the first STOP pulse generated by the comparator of the TDC1000 can be missed at times causing a slight delay to the ToF calculated. Hence why there is a reduction in accuracy, we have had other users that still use this device were high accuracy is not required and they have also implemented the averaging function within the device to reduce the error since the skipped pulse does not occur every run.

    I hope this helps!

    Best,

    Isaac