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1. Factors and solutions affecting liquid flow meters
Factors and solutions affecting liquid flow meters
1. Installation factors influencing factors: Sensor flange is not aligned with the central axis of the pipeline: If the sensor flange of the flow meter is not aligned with the central axis of the pipeline, or if the pipeline temperature changes, stress will be generated, causing asymmetry or deformation of the detection probe, leading to zero drift and measurement errors. Solution: Strictly follow the installation specifications: Ensure that the sensor flange is parallel to the pipeline flange and aligned with the center during the installation of the flowmeter. Zeroing and inspection: After installation, call out the "Zeroing Menu" and record the factory zero preset value. After zero adjustment, observe the zero value at this time. If there is a large difference between the two values, it indicates that the installation stress is large, and it should be reinstalled. 2. Environmental vibration and electromagnetic interference influencing factors: Environmental vibration: The measuring tube of the flowmeter is sensitive to external vibration. If there are other vibration sources, it can cause abnormal vibration and zero drift. Electromagnetic interference: The sensor vibrates the measuring tube by exciting the coil. If there is a large magnetic field interference nearby, it will affect the measurement results. Solution: Choose advanced technology flow meters: Choose flow meters with DSP digital signal processing technology and MVD technology to reduce signal noise and optimize measurement signals. Stay away from interference sources: When designing, stay away from large transformers, motors, and other
III. Influencing factors of measuring medium pressure: Differences between operating pressure and calibration pressure: Changes in measuring medium pressure can affect the tightness of the measuring tube and the degree of Boudon effect, disrupt the symmetry of the measuring tube, and cause changes in the measurement sensitivity of sensor flow rate and density.
. Solution: Pressure compensation: If the operating pressure is a known fixed value, external pressure values can be input on the flowmeter transmitter for compensation; If there is a significant change in operating pressure, configure the transmitter and poll the external pressure measurement device to obtain real-time dynamic pressure values for compensation. 4. Factors affecting two-phase flow: Changes in operating conditions: When operating conditions change, the liquid medium will vaporize, forming two-phase flow and affecting normal metering. Solution: Improve working conditions by evenly distributing bubbles in the process fluid. Straight pipe laying: Avoid vortices caused by bent pipes, which may cause uneven entry of bubbles into the sensor conduit. Increase flow rate: It is better to make the velocity of bubbles passing through the measuring tube in the two-phase flow the same as when they entered. Vertical pipeline installation: upward flow direction, allowing the buoyancy of bubbles to be evenly discharged together with the flowing medium. Use rectifiers and air purifiers to help distribute bubbles evenly in the fluid.Fifth
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