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TDC1000: Mounting transducer to ABS or metal

na na78
Guru 16770 points
Part Number: TDC1000


Hi

We are considering water flow detection using TDC1000.

We just want to know whether water is flowing or not, so we want to use TDC1000 like as ON/OFF switch.

So I think it is OK only  to detect START and STOP signals in this usecase.

Regarding to the following figure, where is the best the transducer should be mounted on?

ABS resin? or Stainless?

Could you please give me your expertise if any?

BestRegards

  • 0
    TI__Mastermind 31655 points
    Hello,

    Will there still be stationary water in the path if it is not flowing? If there is water regardless of whether or not there is flow, I'm not sure the difference in the echo signal generated by a transducer perpendicular to the flow will be able to determine if there is flow or not. If the design has already been proven, then I would be interested to know how the detection is being done if that is something that can be shared.

    Anyway, regardless of the feasibility of the solution, my recommendation is to mount the transducer on whichever material is on the bottom (from the diagram this appears to be the stainless steel). The reason for this is that any air bubbles in the water will rise to the top and will have less effect on the sound path of the transducer.

    Regards,
  • 0 in reply to Scott Cummins
    Guru 16770 points
    Hi Scott

    Thank you for your advice.
    I didn't notice the concern about "any air bubbles".

    >Will there still be stationary water in the path if it is not flowing?
    Yes. Water always exist in the water path and the water level itself is not changed.

    I have not proven it yet.
    (It is very difficult to generate water flow in our demonstration..)

    However, I believe some change at the echo signal would occur.
    I think the echo pulse may not been received and TDC1000 would not generate STOP pulse.

    So I assume,

    STOP pulse is generated : No Water flowing (OFF state)
    STOP pulse is not generated : Water flowing (ON state)

    BestRegards