MU300 Rev1.0 Oct20
Page 24 of 54
Signal intensity (UP/DN indicates upstream/downstream transducer):
UF series ultrasonic flowmeter applies 00.0-99.0 to indicate corresponding signal intensity, the
bigger the value, the stronger the signal intensity. In normal operation, the signal intensity of the
upstream/downstream transducer should be >75 as required. If the signal intensity is less than
75, please check whether the transducer is correctly installed or not again, check whether the
couplant is applied properly or not; check whether the upstream/downstream transducer is on
the same horizontal plane or not, and check whether the two transducer’s installation spacing
is identical with the value shown in M14 or not. If the signal intensity still can’t reach up to over
75 in V-shape installation, please choose Z-shape installation.
Q value (Signal quality):
Q value (Signal quality) indicates the degree of received signals’ quality; the flowmeter applies
00.0-99.0 to indicate relative signal quality, the bigger the value, the better the signal quality. In
normal conditions, the signal quality (Q value) should be over 75.
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.
