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MSP430FR6047: calibration issue

Cherry Zhou
Mastermind 22235 points

Part Number: MSP430FR6047

Hi team,

1) Is the calibration method the same for other fluid flow calibrations?

2) It can be seen in the routine that USS_runAlgorithm_FixedPoint is called, but there's no specific details and process, and this part of the .c file cannot be found. Is this part of the algorithm confidential? 

Thanks.

Best Regards,

Cherry

  • 0
    TI__Guru 71216 points

    Hi Cherry,

    Can you clarify question #1 - Do you mean "is the calibration method used for water the same for other types of fluids?"  If so, what type of fluids?

    Regarding #2, yes, this portion is part of the pre-compiled libraries.  Let me see if I can get the source code for this.

  • 0 in reply to Dennis Lehman
    TI__Guru 71216 points

    HI Cherry,

    I found the specific code customer is asking for. I will send you link to TI-Drive. Let me know if customer needs additional modules.

  • 0 in reply to Dennis Lehman
    TI__Mastermind 22235 points

    Hi Dennis,

    Thanks for your support.

    Dennis Lehman said:
    Can you clarify question #1 - Do you mean "is the calibration method used for water the same for other types of fluids?"  If so, what type of fluids?

    Yes, the fluid is not yet determined and may be calibrated for a variety of liquids. If different from water, would it be possible to modify the calibration on the program? 

    Thanks and regards,

    Cherry

  • 0 in reply to Cherry Zhou
    TI__Guru 71216 points

    Hi Cherry,

    Regarding the fluid type, the speed of sound will be different based on the fluid.  In theory the software should be able to calculate ATOF, dTOF, etc. the same way as water, but I have no experience with fluids other than water to say for sure.  For the calibration of different fluids, I believe it should be same as water, just different coefficients.  Each system will be need to be calculated specific to the fluid.

    Let me check to see what other fluids would work the same as water.

  • 0 in reply to Dennis Lehman
    TI__Mastermind 22235 points

    Hi Dennis,

    Modifications to a variety of liquids may be involved later. The customer currently wants to test the data and then modify this part of the factor, but does not know how this part of the calibration factor should be modified. 

    Also, there is a Mete constant parameter setting in the USS software, diameter = 20mm, length is 100mm, should the units be converted into meters? What formula is used? 

    Thanks and regards,

    Cherry

  • 0 in reply to Cherry Zhou
    TI__Mastermind 46765 points

    Hi Cherry,

    Cherry Zhou said:
    Also, there is a Mete constant parameter setting in the USS software, diameter = 20mm, length is 100mm, should the units be converted into meters? What formula is used? 

    This is the flow rate calculation formula:

    VFR = Meter Constant * dTOF/(absTOFups*absTOFdns)

    With a certain flow rate reading from a reference meter, we can get the dTOF and absTOF value from the software. Then we can get the Meter Constant value based on this formula. You do not need to consider the unit for diameters and length. 

    Cherry Zhou said:
    Modifications to a variety of liquids may be involved later. The customer currently wants to test the data and then modify this part of the factor, but does not know how this part of the calibration factor should be modified. 

    If they run the calibration method without temperature estimation, the calibration method should not related to the liquids type. What kind of calibration factor they do not know how to modified? 

    Best regards,

    Cash Hao

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