The Reasons for the Weak Signal During the Installation of the External Clamp-On Ultrasonic Flow Meter

The external clamp-on ultrasonic flow meter is a highly suitable flow meter for full pipe measurement. It features easy installation, non-contact operation, and can measure the flow of media with large pipe diameters as well as those that are difficult to contact and observe. It has a very high measurement accuracy and is almost unaffected by various parameters of the measured medium. It can especially solve the flow measurement problems of strongly corrosive, non-conductive, radioactive and flammable and explosive media that other instruments cannot. Due to its various features that other types of instruments do not have, it is now widely used in the measurement of various liquids such as tap water, sewage and seawater in industry, and is also applied in the fields of petroleum, chemical engineering and metallurgy.

1.Confirm whether the flow meter in the pipeline is filled with fluid.

2. If the pipe is too close to the wall, the probe can be installed on the pipe diameter with an inclined Angle instead of not on the horizontal pipe diameter. The Z method should be used to install the probe.

3. Carefully select the dense parts of the pipeline and thoroughly polish them until bright. Apply sufficient coupling agent and install the probe properly.

4. Carefully and slowly move each probe near the installation point respectively to find the larger signal point, to prevent the ultrasonic beam from reflecting out of the expected area due to scaling on the inner wall of the pipe or local deformation of the pipe, thus missing the installation point where a stronger signal can be received.

5. For metal pipes with severe scaling on the inner wall, the method of hitting can be used to make the scaling part fall off or crack. However, it should be noted that this method sometimes does not help the transmission of ultrasonic waves at all due to the gap created between the scaling and the inner wall. Since the external clamp-on ultrasonic flow meter is often used to measure dirty fluids, after running for a period of time, a layer of adhesion often accumulates on the inner wall of the sensor, causing malfunctions. It is recommended that, if conditions permit, a filtering device be installed upstream. This will better bring out the stable performance of the instrument and maintain the stability of the measurement data