>> Ultrasonic Flow meter User Manual
7.5 Check Installation
The flow meter includes the detection ability. M90 is used for checking signal strength and quality.
M91 is used for checking the ratio of measured and theoretical transmission time (transmission
time ratio).
1) Check signal strength and quality
M90 is used for checking the signal strength and signal quality(Q value) of upstream and
downstream transducers.
Signal strength is represented by numbers 00.0 ~ 99.9, 00.0 means no signal and 99.0 means
maximum signal. Generally, the flow meter can work properly when signal strength is > 60.0
Signal quality (Q value) is represented by numbers 00 ~ 99. 00 means signal is worst and 99
means signal is best. The flow meter can work properly when Q > 60.
During the installation, please adjust the transducer to make the signal strength and signal
quality the larger the better. This will ensure the flow meter long term stable operation and lead to
accurate measurement.
Signal strength and Q value
2) Check transmission time ratio
M91 is used for displaying transmission time ratio. It is a percentage ratio between theoretical
transmission time and measured transmission time. It shows the relation between setting
parameters and actual transducer installation distance. This ratio should be between 97% ~ 103%.
If not in the range of 97%~103%, it means that the parameters and transducer installation distance
are inconsistent. Please check separately.
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