Ultrasonic heat meters use ultrasonic technology to measure flow and temperature. This measurement method does not rely on mechanical moving parts, thus avoiding measurement instability caused by wear or failure of mechanical parts. At the same time, the propagation and reflection of ultrasonic waves are not directly affected by impurities or bubbles in the water, thereby improving the stability of the measurement. Ultrasonic heat meters accurately process ultrasonic signals through electronic signal processing units, calculate flow and temperature difference, and then obtain calorific value. This electronic processing method has a certain anti-interference ability to external magnetic fields, which can reduce the impact of magnetic fields on measurement results to a certain extent.
In order to further improve the stability of ultrasonic heat meters in external magnetic field environments, some high-end models will use magnetic shielding technology. This includes two methods: external magnetic shielding and internal magnetic shielding. External magnetic shielding isolates the magnetic field through a shielding cover, while internal magnetic shielding uses magnetic shielding materials inside the device to reduce the impact of the magnetic field on internal circuits and components. In the design of circuit boards, ultrasonic heat meters will also adopt anti-interference design. For example, distinguish analog circuits from digital circuits, optimize the layout of power lines and ground lines, and reasonably arrange components such as capacitors to improve the anti-interference performance of the system.
The shell of the ultrasonic heat meter is usually made of high-quality brass and other materials, which not only have good corrosion resistance and mechanical strength, but also can resist the influence of external magnetic fields to a certain extent. The dimensional accuracy and manufacturing process of the product also have an important impact on stability. High-precision manufacturing processes can ensure that the parts of the product fit closely and the gaps are uniform, thereby reducing the measurement instability caused by manufacturing errors.
When installing the ultrasonic heat meter, it is necessary to follow the requirements of the product manual for correct installation. For example, when installing vertically, it must be ensured that it is installed on a straight pipe with water flowing upward. When installing horizontally, it is recommended that the display window and the horizontal plane be installed at 45° to reduce the impact of bubbles on the measurement accuracy. During use, the ultrasonic heat meter needs to be regularly maintained and inspected, including checking the battery voltage and cleaning the sensor surface. These measures can ensure that the heat meter is in good working condition for a long time and reduce the measurement instability caused by improper maintenance.
Ultrasonic heat meters ensure that they can maintain functional stability in an environment with an external magnetic field through their unique working principle, anti-magnetic interference design, high-quality material selection and manufacturing process, and correct use and maintenance methods. However, it should be noted that although ultrasonic heat meters have a certain ability to resist magnetic interference, they may still be affected to a certain extent in extremely strong magnetic field environments. Therefore, when using it, try to avoid placing it in a strong magnetic field environment.