Cleaning and Prevention of Blockage
Mechanical flowmeters (such as turbine or gear flowmeters) are susceptible to the effects of impurities, sediment, or scale buildup within the medium; therefore, the fluid channels and mechanical components should be cleaned periodically. Although electromagnetic and ultrasonic flowmeters are free of mechanical friction, they still require periodic inspection of their electrodes and the inner walls of the piping when the liquid contains a high concentration of solids or when sediment is present. Maintaining unobstructed flow channels within the meter helps ensure the long-term stability of measurement accuracy.
Periodic Inspection
Inspect the flowmeter's housing, wiring terminals, protective covers, and seals to ensure there are no signs of looseness, cracks, or corrosion. Electrical connections must be secure to prevent signal anomalies caused by moisture ingress or poor contact. For detachable components, verify that they are firmly installed to prevent displacement or measurement errors caused by vibration or the impact of fluid flow.
Calibration and Commissioning
Flowmeters should be calibrated in accordance with the manufacturer's instructions or established verification schedules, particularly in applications involving commercial billing or high-precision process control. Calibration can be performed using standard flow rigs or via on-site comparative methods; during this process, the zero point, full-scale output, and intermediate points should be checked and adjusted as necessary to ensure that measurement accuracy meets the required specifications.
Environmental Protection and Record Keeping
Flowmeters should not be exposed for extended periods to environments characterized by severe corrosion, high temperatures, or strong electromagnetic interference. Where necessary, protective covers or shielding measures should be installed. Additionally, a maintenance log should be established to record details regarding cleaning, calibration, and any detected faults; such records facilitate future maintenance decision-making and overall equipment management.
