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MSP430FR6043: minimum pipe diameter?

Part Number: MSP430FR6043
Other Parts Discussed in Thread: MSP430FR6007, MSP430FR6047


Looking at the MSP430FR6043 datasheet page 1 we can see a pipe diameter range from 15mm to 1000mm.
For other devices like MSP430FR6007 and MSP430FR6047 I have not found any mention of pipe diameter in the datasheet.

-Is the 15mm it linked with the fact that we have not done testing on diameter lower than 15mm? or is it a limit of the ulrtrasound technology self (ie wavelength range and accuracy of measure)? or a limit of the MSP430 side sensing (USS module, libraries, GUI tools..etc)?

-For a particular use case the pipe diameter would be between 5 mm and 15mm. Assuming we find pipes and tranduscer for this use case what would be limitation from the MSP430FR6043 side?

Thanks in advance,


  • Hello Anber,

    The MSP430FR6043 was initially targeted for gas metering application, so that pipe size reference is relating to gas pipes.  

    On the water metering side, we have done testing with DN-25 pipes, but smaller can certainly be used as well. 

    At these sizes, I assume this will be a clamp on application.  With such small diameters, the issue is that the spacing of the transducers will be very small.  Because of this, the resolution of the measurements will be impacted.  There is also the issue of noise and reflections when the transducers are this close.  This could potentially be filtered well enough though. 

    My opinion is that 5mm will be difficult to obtain accurate measurements, but 15mm should be okay.  Is 5mm the ID or OD?