LRF-3000P Ultrasonic flowmeter
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Signal intensity (UP/DN indicates upstream/downstream transducer):
LRF 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 V-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.
Chapter VI Operation
Note:
The flowmeter would be calibrated and debugged before leaving factory, and its parameters would