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P118i Ultrasonic Flowmeter and Analyzer
Reversion: 3.0.0 Page 42 of 49
Signal Strength and Signal Quality
Display the measured signal strength and signal
quality Q value upstream and downstream.
Signal strength is indicated from 00.0~99.9. A reading
of 00.0 indicates no signal detected, while 99.9
indicates maximum signal strength. Normally the
signal strength should be
≥
60.0.
Signal quality Q is indicated by 00~99. Therefore, 00
indicates the poorest signal while 99 indicates the best
signal. Normally, signal quality Q value should be
better than 50.
TOM/TOS*100
Display the ratio between the actual measured
transmit time and the calculated transmit time
according to customer
’
s requirement. Normally the
ratio should be 100
±
3
％
. If the difference is too large,
the user should check that the parameters are entered
correctly, especially the sound velocity of the fluid
and the installation of the transducers. This data is of
no use before the system is ready.
Fluid Sound Velocity
Display the measured fluid sound velocity. Normally
this value should be approximately equal to the
entered value in Window M21. If the difference is too
large, it probably results from an incorrect value
entered in Window M21 or improper installation of
the transducers.
Total Time and Delta Time
Display the measured ultrasonic average time (unit:
nS) and delta time of the upstream and downstream
(unit: nS) time. The velocity calculation in the
flowmeter is based on the two readings. The delta time
is the best indication that the instrument is running
steadily. Normally the fluctuation in the ratio of the
delta time should be lower than 20%. If it is not, it is
necessary to check if the transducers are installed
properly or if the parameters have been entered
correctly.