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Common Field Faults of Ultrasonic Flowmeters

Author:QINSUN Released in:2023-06 Click:71

Common on-site failure phenomena of ultrasonic flowmeters mainly include: the flow rate display is abnormal and the data changes drastically; the reading is incorrect; sensor is good, but flow is low or there is no flow; when the control valve is partially closed or the flow is reduced, the reading will reverse Raise. Here are some of the most common problems in the field, for your reference.

Problem 1: Incorrect readings, cause of on-site failure analysis: A. The sensor is installed at the top and bottom of the horizontal pipe, which interferes with the ultrasonic signal. B. The sensor is installed on the pipeline where the water flows down. Not filled with liquid. Correct handling method: A. Install the sensor on both sides of the pipe B. Install the sensor on the fluid-filled section of pipe.

Problem 2: The flow rate display is abnormal and the ddata change drastically; On-site cause analysis: The sensor is installed in a place where the pipeline vibrates strongly or the device that changes the flow state (such as a control valve, pump, and the downflow of the withdrawal hole is correct. Method of processing: Install the sensor away from the source of vibration or move it upstream of the device that changes the flow status

Question 3: The reading increases when the control valve is partially closed or that the flow is reduced. On-site failure cause analysis: sensor It is installed too close to downstream of the control valve. When the valve is partially closed, the flow meter actually measures the flow rate of the reduced flow of the control valve Flow increases due to size reduction Proper treatment method: keep sensor away from control valve, and upstream of sensor away from control valve 30D or movethe sensor upstream of the control valve and 5D away from the control valve.

Problem 4: The sensor is good, but the flow rat is low or there is no flow . On-site failure analysis: A. Due to paint and rust on the outside of the pipeline, it is not cleaned. B. The surface of the pipe is uneven or it is installed at the weld bead. C. The roundness of the pipe is not good, the inner surface is not smooth, and there is scaling of the pipe coating. If the pipe is a cast iron pipe, this situation may occur. D. The measured medium is pure or the suspended solids are too low. E. The sensor is installed on the fiberglass pipe. F. The sensor is installed on the housing, which will weaken the ultrasonic signal. G. The sensor is not well coupled with the pipe, and the coupling There are gaps or air bubbles on the surface. The correct treatment method: A. Clean againwater the pipe and install the sensor. B. Grind the pipe or pull it away from the weld. C. Choose a location with a smooth interior surface such as a pipe or steel liner. D. Choose another suitable type of instruments. E. Remove fiberglass. F. Move sensor to section of pipe without enclosure. G. Reinstall couplant.

Additionally. When choosing an ultrasonic flow meter, the user should fully consider some physical and chemical properties of the medium and make a reasonable choice.

If you encounter the problems listed above, you can operate according to the instructions mentioned above. treatment methods. If you still can\'t use it, please contact the manufacturer. Best wishes Good life