Hubei vortex flowmeter | Advantages and disadvantages of vortex flowmeter

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1. How to adjust an inaccurate vortex flowmeter? The measurement of an inaccurate vortex flowmeter needs to be systematically investigated and adjusted from three aspects: installation conditions, parameter settings, and interference elimination Installation condition inspection: Installation problems are the most common cause of measurement errors and need to be focused on: • Straight pipe section requirements: Ensure that there is a straight pipe section upstream of the flowmeter with a diameter of 10-40 times the diameter, and a straight pipe section downstream with a diameter of 5 times the diameter, to avoid interference from flow elements such as elbows and valves affecting the flow field • Full pipe status confirmation: Check whether there is gas-liquid two-phase flow or incomplete pipe in the pipeline, and the installation position should avoid the highest point of the pipeline to prevent gas accumulation • Sensor centering installation: Check whether the probe is aligned with the centerline of the pipeline and whether the sealing gasket is offset, causing changes in the flow area. 2 Parameter setting calibration • Instrument coefficient verification: Re enter the instrument coefficient (unit: pulse number/cubic meter) marked on the nameplate into the converter. Incorrect coefficient will cause linear deviation • Medium parameter setting: Re enter the actual medium density (kg/m ³) and viscosity (cP), and steam medium needs to compensate for temperature and pressure parameters • Range setting: Check whether the upper and lower limits of the range cover the actual flow range. It is generally recommended that the working flow rate be between 30% and 70% of the full range Interference elimination measures • Vibration interference handling: Install shock-absorbing brackets in the pipeline before and after the flowmeter, adjust the filtering time constant (usually set to 3-10 seconds) to suppress the influence of mechanical vibration • Electromagnetic shielding strengthening: Replace the double-layer shielded cable, keep the distance between the signal line and the power number control cable>0.5 meters, and install a magnetic ring filter if necessary • Zero calibration operation: Close the pipeline valve to zero the flow rate, and execute the "Zero Adjust" function through the operation menu (see the corresponding model manual for specific operation) The final verification method adopts the comparative verification method: a 0.5-level precision ultrasonic flowmeter is connected in series behind the flowmeter, and data is recorded at three flow points of 30%, 50%, and 80%. If the relative error is greater than ± 1.5%, it is necessary to contact the manufacturer to recalibrate the sensor sensitivity. It is recommended to gradually investigate in the above order, and over 80% of measurement deviations can be resolved through the first three steps. If there is damage to internal components (such as decreased sensitivity of piezoelectric crystals), they need to be returned to the factory for maintenance.

2. Common faults and troubleshooting methods of vortex flowmeter "Knowledge sharing"

Vortex flowmeter faults can be divided into two categories: system faults and instrument faults. After a fault occurs, the system fault should be checked first, followed by the instrument fault.

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