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EVM430-FR6047: VFR Flow+Temperature

M_K_T
Prodigy 160 points

Part Number: EVM430-FR6047

We are currently evaluating the correction using "VFR Flow+Temperarure".

I have a question about the temperature that is being estimated from absoluteTOF in it.

When we check the calculation results, we are able to measure the water temperature with an accuracy of ±0.5 to 1°C compared to the actual measured value at 10°C to 20°C. However, at 40°C to 50°C, the error is around -4°C.

Do you know the cause?
Also, please let us know if there are any countermeasures.

Also, if possible, I would like a reply by e-mail. 

Best regards

Masaki Kubota

  • 0
    TI__Mastermind 46765 points

    Hi Masaki,

    What material is your pipe made of? Is it brass or plastic? 

    Our temperature algorithm is based on the sound velocity approximately equals to acoustics length/average of absTOFUPS and absTOFDNS. Then find the temperature data corresponding to the sound velocity in the look-up table. 

    Based on your reports that you observing the temperature error goes high at 40 to 50 degC. The first thing need to check is if the acoustics length has changed and causing the issue. A plastic pipe might cause this issue. You can use a known sound velocity*average of absTOFUPS and absTOFDNS at different temperatures to check the if the acoustics length is changing during temperature. Usually, the results should be similar because the acoustics length should not change. 

    Best regards,

    Cash Hao

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