1. Frequent data jumps and severe value fluctuations
[Core causes] Insufficient straight pipe sections leading to turbulent flow fields, media containing a large number of bubbles, pipeline vibration, or strong electromagnetic interference.
[Solutions] Ensure 10D straight pipe sections before and 5D after the instrument (D is the inner diameter of the pipeline), and install exhaust valves upstream to remove bubbles completely; reinforce the pipeline and sensors, properly ground the instrument, and keep it away from strong electromagnetic equipment such as frequency converters and high-voltage cabinets.
2. No instrument signal and no flow value display
[Core causes] Misalignment of sensor installation, insufficient or dried coupling agent; scaling on the inner wall of the pipeline, strong signal attenuation of pipe materials; incorrect setting of instrument parameters such as pipe diameter and medium.
[Solutions] Re-calibrate the sensor position, reapply special coupling agent, and polish rust and paint on the pipe wall; for working conditions with severe scaling, give priority to plug-in/pipe-section type instruments; check and correct instrument parameters to ensure they match the on-site working conditions.
3. Large measurement errors and substandard accuracy
[Core causes] Unfilled pipeline, instrument zero drift, lack of temperature and pressure compensation.
[Solutions] Install the instrument in a vertical pipeline (with fluid flowing from bottom to top) or other positions that are always full; re-calibrate the zero point under the condition of full pipe and no flow; for hot water and media with large temperature fluctuations, equip with temperature and pressure compensation modules to correct parameters.
4. No display for small flow rates and failure to measure low flow rates
[Core causes] Insufficient instrument range ratio, actual pipe diameter being too large leading to flow rate below the lower limit, excessively high signal threshold settings.
[Solutions] Select ultrasonic flowmeters with a wide range ratio; for working conditions with large pipe diameters and small flow rates, pipe reduction can be done to increase the flow rate; reasonably adjust the instrument signal threshold and optimize small flow filtering parameters.
