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Detail the installation of the ultrasonic flowmeter


Introduction to installation of ultrasonic flowmeter
Jet lag ultrasonic flowmeter is a competitive flow measurement method in the world today, with accuracy over 1.0%.Because of the diversity of industrial site, especially the surrounding environment of pipeline, how to install ultrasonic flow meter according to the specific environment has become an important subject in the field of ultrasonic flow measurement.Therefore, the accuracy, reliability and stability of the ultrasonic flowmeter are more perfectly reflected, and the maintenance work in the future is greatly reduced or maintenance-free.
Installation details
Before installation of ultrasonic flowmeter, it is necessary to know the site situation, including:
1. What is the distance between the sensor and the host machine?
Pipe material, pipe wall thickness and pipe diameter;
Pipeline life;
Whether it includes fluid type, impurities, bubbles and tubing;
Fluid temperature;
Whether there is interference source at the installation site (e.g. frequency conversion, strong magnetic field, etc.);
The host is equipped with 4 branch temperatures;
8. Whether the power supply voltage is stable;
9. Whether remote signals and types are required;
According to the field conditions provided above, the manufacturer can configure according to the field conditions and customize the model if necessary.
Installation position
The choice of installation segment has great influence on the test accuracy.The selected segment must be free from interference and eddy currents that have a significant impact on the measurement accuracy, and the segment must generally meet the following conditions:
1, do not install the machine in the pump, high power radio, frequency conversion, that is, where there is strong magnetic field and vibration interference;
2. The pipe should be uniformly dense and select the pipe segment that is easy to be transmitted by ultrasonic wave;
3. In order to have a sufficiently long linear segment, the upstream linear segment of the hardpoint must be greater than 10D(note: D= diameter), and the downstream must be greater than 5d;
4. The upstream of installation point should be 30D away from the pump;
5. The fluid must be filled with pipes;
6. There should be enough space around the pipeline for on-site operation. The underground pipeline should be used as a test well, which is as follows:
Installation method
Ultrasonic flowmeters usually have two methods of probe installation: Z method and V method.
However, if d is less than 200mm and the site situation is one of the following, the Z method can be used for installation:
1, high fluid turbidity measurement, no signal or weak signal, v method measurement.
2. When the inner wall of the pipe is lined;
3. Long pipeline life, serious inner wall scaling;
If piping conditions are better, even if D is slightly larger than 200mm, it can be installed by means of V to improve measurement accuracy.
Probe location
1. Input pipe parameters in the instrument, and then select probe installation method to export installation distance.
2. In horizontal pipes, the middle of the pipe should be chosen to avoid the top and the bottom (the top may have bubbles and the bottom may have precipitates).
3. V mode installation: first determine one point, then measure another point from the horizontal position according to the installation distance.
Installation Z method: first determine one point, measure another point horizontally according to the installation distance, and then measure the symmetric point of the point on the other side of the pipe.Pipe processing
After the probe position is determined, the pipe is ground to a soft, non-porous light with tools such as Angle grinder, file and sandpaper within 100mm of the two installation points.
Requirements: uniform gloss, no ups and downs, soft feel.The polishing point should be the same arc as the original pipe, the mounting point should be ground to a plane, and the range should be cleaned with alcohol or gasoline to facilitate the probe bonding.
wiring
Probe and instrument wiring
Probe (sensor)
Probes can be divided into three types, depending on the actual measurement of the pipe.
Type S sensor (15-100 mm)
M-type sensor (50-700mm)
L-type sensor (300-6000 mm)
Fine-tuning detection
After filling the wire, put it in the silicon for 30 minutes, fix the probe on the pipe trimmed with silica gel and cassette (note the direction of the probe and the end of the lead wire outward), observe the signal strength, good condition and transmission time ratio of the instrument, and fine-tune the position of the probe until the signal of the instrument reaches the specified range.
(Signal strength: Usually must be greater than 6.5, with a few exceptions depending on site conditions.)To get the details
(Good signal: low peaks usually range from 7 to 14, and peaks usually range from 25 to 80.)To get the details
(Transmission time ratio: 100 to 4, this value should be stable.)To get the details
Experience with ultrasonic flowmeter
The flowmeter has two modes: diagonal and reflection. When the reflection mode cannot be measured, it can be measured diagonally. The reflection mode is used later.
The flowmeter has a higher requirement on the pipeline, and the insulation layer must be scraped out.Otherwise you can't measure it.When we measure the air conditioning water system, we cut the insulation layer with a knife, plug the sensor, after the measurement, paste the cut insulation layer.The surface of the pipe should be as bright as possible. If it is too rough, sand it with sandpaper.
Since it is difficult to measure the flow of non-fluid pipelines, straight pipe sections such as elbows and valves should be selected as far as possible.
The accuracy of meter readings depends on signal strength, and if the signal is too low, the results are largely unreliable, usually below 60%.
It is recommended to use a continuous reading of the flowmeter (e.g., 1 minute continuous reading recording, average) as the reading may change significantly.
Measuring hot water pipes is more difficult than cold water pipes.Water tube wall temperature is high, coupling agent is easy to melt at high temperature.We have all used toothpaste except for the binder.
1.
The flowmeter has two modes: diagonal and reflection. When the reflection mode cannot be measured, it can be measured diagonally. The reflection mode is used later.
2.
The flowmeter has a higher requirement on the pipeline, and the insulation layer must be scraped out.Otherwise you can't measure it.When we measure the air conditioning water system, we cut the insulation layer with a knife, plug the sensor, after the measurement, paste the cut insulation layer.The surface of the pipe should be as bright as possible. If it is too rough, sand it with sandpaper.3.
Since it is difficult to measure the flow of non-fluid pipelines, straight pipe sections such as elbows and valves should be selected as far as possible.
4.
The accuracy of meter readings depends on signal strength, and if the signal is too low, the results are largely unreliable, usually below 60%.
5.
It is recommended to use a continuous reading of the flowmeter (e.g., 1 minute continuous reading recording, average) as the reading may change significantly.
6.
Measuring hot water pipes is more difficult than cold water pipes.Water tube wall temperature is high, coupling agent is easy to melt at high temperature.We have all used toothpaste except for the binder.
Measurement accuracy and accuracy have not improved.
Fixed probe
After the instrument signal is adjusted and the probe is fixed with the installation equipment, note that the wire rope does not tilt to prevent the probe from moving and to prevent the periphery of the silicone seal probe from contacting with the pipe.The glue takes a day or so to set, so make sure the probe is waterproof before drying.The external screen of the signal line must be reliably grounded.
All kinds of ultrasonic flowmeters are different, this paper only for reference!