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Original question:

TDC1000: Trying to find the suitable sensor for concentration measurement on flowing slurry in pipeline.

TDC1000: About the flow meter design.

Kengo.Y
Guru 11255 points
Part Number: TDC1000
Other Parts Discussed in Thread: TDC7200, TUSS4470, TUSS4440

Hi team.

I will use TDC1000 for design the flow meter.

However according to E2E(https://e2e.ti.com/support/sensors/f/1023/p/869605/3217618?tisearch=e2e-sitesearch&keymatch=tdc1000#3217618),

TDC1000 is not recommended for the flow meter.

Why not recommend?

My understand is it have issues in repeatability and accuracy when there is no flow.

I think this problem can be solved by using TDC7200.

(According to http://www.tij.co.jp/jp/lit/an/snaa220a/snaa220a.pdf)

What do you think?

Sincerely.

Kengo.

  • 0
    TI__Mastermind 27950 points

    Kengo,

    We are now recommending the newer TUSS4470 or TUSS4440 devices to displace all TDC1000 applications, given the improved performance of the TUSS44x0.

    The biggest problem of the TDC1000 is a device bug related to the stop pulses. In some cases, the first stop pulse can be missed (not reported/output) by the TDC1000 device. Considering flow metering relies heavily on pico-second timing accuracy, missing the stop pulse can have a significant impact on the flow rate measurement. It is possible to perform multi-cycle averaging to compensate for the occasionally missed first stop pulse.

    You can see this issue discussed in more detail with another user on this E2E post: https://e2e.ti.com/support/sensors/f/1023/t/794398?TDC1000-TDC1000-no-stop-signal

    The TUSS44x0 devices do not have a first stop pulse issue. The TUSS44x0's O3 pin Echo Interrupt feature is similar to the digital toggle of the TDC1000's START/STOP pin functionality, but combined into a single pin.