There are four ways to install the external clamp ultrasonic flowmeter. They are V method, Z method, N method and W method. In general, the V method is preferred when the installation pipe diameter is within the range of DN15-200mm. The Z method can be used when the signal cannot be detected by the V method or the signal quality is poor. The Z method should be preferred when the pipe diameter is above DN200mm or when measuring cast iron pipes. Law. N method and W method are less used methods, suitable for installation of thin pipes below DN50mm.
1. V method installation
Under normal circumstances, the external clamp type ultrasonic flowmeter adopts the V method to be a relatively standard installation method, which is convenient to use and accurate. -DN400mm.
2. Z method installation
When the pipeline is very thick or suspended solids in the liquid, the inner wall of the pipe is too thick or the lining is too thick, etc., the V method installation signal is weak and the machine cannot work normally, the Z method is required for installation. The characteristic of Z method is that the ultrasonic wave is directly transmitted in the pipeline, there is no reflection (called single sound path), and the signal attenuation is small. The Z method installation can measure the pipe diameter from 100mm to 6000mm. During the actual installation on site, it is recommended that the pipes above 200mm should be installed using the Z method.
3. N method installation
The characteristic of N method installation is to improve the measurement accuracy by extending the ultrasonic transmission distance. When the N method is used for installation, the ultrasonic beam is reflected twice in the pipeline and passes through the fluid three times (called three sound paths), which is suitable for measuring small diameter pipelines.
4. W method installation
Like the N method installation, the W method installation also improves the measurement accuracy of small pipe diameters by extending the ultrasonic transmission distance. W method installation is suitable for measuring small tubes below 50mm. When the W method is used for installation, the ultrasonic beam reflects three times in the tube and passes through the fluid four times (called four sound paths).