Chapter 4 Transducer installation
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4.2.1. Signal strength
Signal strength (displayed in Window M90) indicates a detected strength of the
signal both from upstream and downstream directions. The relevant signal
strength is indicated by numbers from 00.0~99.9. 00.0 represents no signal
detected while 99.9 represents maximum signal strength.
Normally, the stronger the signal strength detected, the longer the operation of the
instrument reliably, as well as the more stable the measurement value obtained.
Adjust the transducer to the best position and check to ensure that enough sonic
coupling compound is applied adequately during installation in order to obtain the
maximum signal strength.
System normally requires signal strength over 60.0, which is detected from both
upstream and downstream directions. If the signal strength detected is too low, the
transducer installation position and the transducer mounting spacing should be re-
adjusted and the pipe should be re-inspected. If necessary, change the mounting
method to be Z method.
4.2.2. Signal quality (Q value)
Q value is short for Signal Quality (displayed in Window M90). It indicates the level
of the signal detected. Q value is indicated by numbers from 00~99. 00 represents
the minimum signal detected while 99 represent the maximum.
Normally, the transducer position should be adjusted repeatedly and coupling
compound application should be checked frequently until the signal quality
detected is as strong as possible.
4.2.3. Total time and delta time
"Total Time and Delta Time", which displays in Window M93, indicates the
condition of the installation. The measurement calculations in the flowmeter are
based upon these two parameters. Therefore, when "Delta Time" fluctuates widely,
the flow and velocities fluctuate accordingly, this means that the signal quality
detected is too poor. It may be the resulted of poor pipe-installation conditions,
