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Sound velocity:
Vel. value indicates the sound velocity and the actual sound velocity measured by the
flowmeter. Under normal conditions, it should be close to the sound velocity shown in M12
menu. If the difference is too big, you should check the installation settings and whether it is
properly installed or not.
Transmission time (Ratio):
Transmission time is used for checking whether the installation spacing of two
transducers is correct or not; If they are installed correctly, the transmission time should be
100±3%.
Total transmission time (Unit: us) and time difference (Unit: ns):
When the time difference fluctuates too greatly, the flow and flow rate would change
greatly, it indicates that the signal quality is poor, which may be cause by bad pipe conditions,
improper installation or parameter errors. Under normal conditions, the fluctuation of time
difference should be less than ±20%. But when the pipe diameter is too small or the flow
rate is extremely low, its fluctuation would exceed the normal value a little.
