The installation requirements for ultrasonic flowmeters involve multiple aspects to ensure the accuracy of measurement results and the stable operation of the equipment. The following are specific installation requirements:
1. Site environment requirements
No strong interference sources: There should be no strong interference sources such as motors and magnetic fields near the installation points of the host and sensor of the ultrasonic flowmeter to prevent signal confusion or inability to reach.
Away from interference locations: The sensor installation point should be away from valves, tees, elbows and other locations that may generate eddies or turbulence to reduce the impact on measurement accuracy.
Temperature and pressure: The temperature and pressure at the installation point should be within the working range of the sensor to ensure the normal operation and measurement accuracy of the sensor.
2. Pipe material requirements
Pipeline material: Ultrasonic flowmeter sensors are available in three types: pipeline type, insertion type and external clamp type. For pipeline sensors, there are basically no special requirements for pipeline materials, as long as the flanges are perfectly docked. Insertion sensors require a welding base, so the pipeline material must meet the welding requirements. External clamp sensors are generally suitable for dense materials that are easy to transmit ultrasonic waves, such as stainless steel, carbon steel, cast iron, PVC plastic, etc. If there is anti-rust paint on the outside of the pipeline, it needs to be polished to ensure the transmission effect of ultrasonic waves.
Pipeline condition: Try to choose a scale-free pipe for installation. If there is scale on the inner wall of the pipe, it should be considered as a lining for better measurement accuracy. At the same time, the age of the pipe is also a factor to consider. For pipes with a long service life, special installation methods (such as insertion) may be required to improve measurement accuracy.
3. Straight pipe section requirements
The ultrasonic flowmeter requires sufficiently straight front and rear pipe sections to ensure the stable flow state of the liquid in the pipe, thereby improving the accuracy of the measurement results. Generally, it is required that there is a uniform straight pipe section with a distance of 10 times the pipe diameter upstream of the sensor and a distance of 5 times the pipe diameter downstream without any valves, elbows, reducers, etc. Such a design can reduce the turbulence and eddy current of the fluid and improve the measurement accuracy.
4. Installation steps and debugging
Observe the site: First observe whether the pipeline at the installation site meets the straight pipe section requirements and whether it is far away from the interference source.
Confirm the medium and full pipe: Confirm the fluid medium in the pipeline and whether it is full, because the full pipe will affect the measurement accuracy.
Measure the installation distance: Accurately measure the installation distance. For external clamp-on sensors, you can choose an approximate distance and continuously debug to achieve the best signal and transmission ratio; for plug-in sensors, special tools are required to measure to ensure accuracy.
Installation and debugging: After installing the sensor, debug the signal to ensure that the signal is stable and the transmission is normal. Then waterproof it and organize the waste such as the wire ends on the site.
Acceptance and signature: After the installation is completed, acceptance and signature confirmation are carried out to ensure the installation quality and measurement accuracy.
The installation requirements of ultrasonic flowmeters involve many aspects, such as site environment, pipe materials, straight pipe sections, installation steps and debugging. Only by strictly following these requirements for installation and debugging can the accuracy of measurement results and the stable operation of the equipment be ensured.