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Ultrasonic Heatmeter
Operation Manual
15
to ensure proper operation and high reliability of the transducer. It can be confirmed by checking the detected
signal strength, total transit time, delta time as well as transit time ratio.
The "mounting" condition directly influences the flow value accuracy and system long-time running reliability. In
most instances, only apply a wide band of sonic coupling compound lengthwise on the face of the transducer and
stick it to the outside pipe wall to get good measurement results. However, the following inspections still need to
be carried out in order to ensure the high reliability of the measurement and long-term operation of the instrument.
4.2.1. Signal Strength
Signal strength (displayed in Window M04) 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 represent 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 compounds is applied
adequately during installation in order to obtain the maximum signal strength.
System normally requires signal strength over 75.0, 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 M04). 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 M04, indicates the condition of the installation. The
measurement calculations in the Flow meter 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, inadequate transducer installation or incorrect
parameter input.
Generally, "Delta Time" fluctuation should be less than
±
20%. Only when the pipe diameter is too small or
velocity is too low can the fluctuation be wider.
4.2.4. Transit Time Ratio
Transit Time Ratio indicates if the transducer mounting spacing is accurate. The normal transit time ratio should
be 100+/-3 if the installation is proper. Check it in Window M04.
Attention
If the transit time ratio is over 100
±
3%, it is necessary to check:
(1)
If the parameters (pipe outside diameter, wall thickness, pipe material, liner, etc.) have
been entered correctly,
(2)
If the transducer mounting spacing is accordance with the display in Window M14,
(3)
If the transducer is mounted at the pipe’s centerline on the same diameter,
(4)
If the scale is too thick or the pipe mounting is distorted in shape, etc.