Fujifilm ultrasonic flowmeter probe installation method and orientation. There are generally two types of probe mounting: the V method and the Z method, and experience has shown that the V method has a higher measurement accuracy than the Z method without affecting the signal reception. Since the V-method probe mount allows for precise positioning, the measurement error is mainly due to flow regimes and piping parameters. However, the Z method installation has a short sound path, although the signal is strong, the probe positioning is difficult, and it is easy to produce installation errors, and the large-diameter pipeline is more prominent.
Fujifilm ultrasonic flowmeter
Fujifilm Ultrasonic Flowmeter FSC/FSV/FLR
The relationship between installation and metering accuracy
1. Fujifilm flowmeter probe installation method and orientation. Generally, there are two ways to install the probe: V method and Z method,
Experience has shown that without affecting signal reception,
The measurement accuracy of the V method is higher than that of the Z method. Due to the V-method probe installation for easy and precise positioning,
Therefore, the measurement error mainly comes from the flow regime and piping parameters.
However, the Z method installation has a short sound path, although the signal is strong, the probe positioning is difficult, and it is easy to produce installation errors.
Large-diameter pipes are more prominent.
2. Probe spacing and radial misalignment.
The positioning error of the probe spacing causes the error of the sound path, which directly affects the measurement accuracy, and the signal cannot be found in serious cases.
Table 4 The relationship between the spacing deviation of the probe installed by the V method of steel pipe and the measurement accuracy
The radial misalignment of the probe generally has little effect on the measurement results, but it does affect the strength of the signal. Installation requires the sound beam to pass through the center of the pipe,
Otherwise, the signal will be seriously attenuated due to the mismatch between the transmission and reception angle of the sound wave, until it cannot be measured.
3. Installation environment, couplant, signal cables, and others. Portable ultrasonic flowmeters use multi-pulse, wide-band signals,
It has a certain ability to resist electromagnetic interference,
However, it cannot fully work normally when there are high frequencies at the installation site, especially when there are variable frequency interference sources. If the probe signal cable is too long, the signal will be attenuated,
Generally should not exceed 200 meters,
And a coaxial cable with a specific impedance should be used, with special ends, and there should be no joints in the middle. Ultrasonic couplant should be used as much as possible with good sound conductivity,
Viscous substances that are not easy to mix with gases, such as water glass, petroleum jelly, etc.
The above briefly analyzes the accuracy and some problems in the use of portable ultrasonic flowmeters caused by factors such as piping and installation.
In fact, there are two main factors that cause errors: one is the calculation error of the cross-sectional area of the pipeline.
This is a common problem for all flow rate meters.
The second is the ultrasonic sound path error, according to the principle of the time-of-flight flowmeter:
By: t1 = L / ( C + v )
t2 = L / （ C——v ）
Δt = t2 —— t1 = 2 L v / C2
v = Δt C2 / 2 L,
decreases, the measurement results are low, and vice versa.
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