| Q&A for the basic specifications |
| Q |
What is an ultrasonic flowmeter? |
| A |
An ultrasonic flowmeter transmits ultrasonic signals through the fluids (liquids or gas) in a pipe, and uses the transmitted and received signals to measure the flow volume in the pipe. |
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| Q |
What is the measurement principle of an ultrasonic flowmeter? |
| A |
There are various measurement methods; here, we will explain the transit-time method used in our products. With this method, ultrasonic signals are transmitted upstream and downstream at a diagonal direction through the fluids in a pipe, and the difference in the propagation times for the upstream and downstream signals is used to determine the flow velocity. The flow volume is determined by multiplying the cross section of the pipe by the flow velocity. |
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| Q |
What are the advantages of an ultrasonic flowmeter? |
| A |
Sensors can be mounted in various ways, depending on the ultrasonic flowmeter type. We will explain the advantages of the clamp-on method used in our products. With this method, sensors are mounted on the outer surface of the pipe, eliminating the need for piping work. In addition, not having the sensors in direct contact with the fluids is an advantage. (Corrosion resistance and pressure loss are no longer an issue, and there is no risk of contamination.) |
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| Q |
What types of ultrasonic flowmeters are available? |
| A |
Both fixed and portable models are available. The fixed type is permanently installed at a measuring site, whereas the battery-powered portable type can be used to perform maintenance and inspections in various locations.
Please see the list comparing the ultrasonic flowmeter models. |
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| Q |
Are there any reference materials for the US series ultrasonic flowmeters? |
| A |
Catalogs, general specifications, and drawings can be downloaded from our website.
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| Q&A for the products |
| Q |
Is there any special function for ensuring stable flow volume measurement in cases such as when there are air bubbles present in the fluid? |
| A |
We have previously used the trigger method, but to assure stable measurements with this product we used the correlation method. |
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| Q |
What types of measuring paths are there?
(one-path, two-path, multi-path) |
| A |
With one-path measurement, a single pair of sensor elements (transducers) are used on the pipe. Similarly, when two pairs of transducers are installed, this is two-path measurement. When more than two pairs of transducers are installed, this is referred to generally as "multi-path measurement." By using multi-path measurement, output fluctuation can be reduced. |
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| Q |
A pair of transducers can be installed on opposing sides or on the same side of the pipe. What criteria are there for determining their position? Also, does the installation method depend on the type of fluid? |
| A |
It depends mainly on the pipe size. Usually, the transducers are installed on the same side. Large pipes may cause a weak signal so then the sensor elements are installed on opposing sides. Generally, this is not affected by the kind of fluid. |
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| Q |
Do we need to take into consideration the presence of couplings (welds/flanges) when calculating the optimum length of a straight pipe run for an ultrasonic flowmeter? |
| A |
If there are no projections or the like on the inside of the straight pipe couplings, and if these couplings themselves do not disrupt the flow profile, it is not necessary to take this into consideration when determining the length of a straight pipe run. |
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| Q |
Are special measures necessary to protect the parameter settings? |
| A |
As nonvolatile memory is used, there is no need to worry about losing parameter settings, such as can occur when the memory is powered by a battery. |
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| Q |
I would like to select pulse output for binary output but I do not know how to set the parameter. How do I do that? |
| A |
First, in "Proc.Outputs" under "Special Functions," set the "source item for the binary output" to "pulse output." Next, set the pulse weight value, etc. in the "Output Options." |
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| Q |
Please explain the totalizer function. |
| A |
The totalizer function totalizes volume flow or mass flow (by setting density), and displays ten digits for each channel. The function totalizes positive flow direction and negative flow direction separately. |
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| Q&A: US300PM (Portable type) | US300FM (Fixed type) |
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