Reasons for Fluctuations in Vortex Flow Meters | Will there be fluctuations during the blowing of vortex flow meters for measuring liquid flow

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1. When the flow rate of the vortex flowmeter is high, the flow rate tends to be small. The core reason for the small measurement value of the vortex flowmeter when the flow rate is high is that the vortex generating body is wrapped by impurities or mechanically damaged on the upstream surface, resulting in a drift of the K coefficient (instrument coefficient). 1. Problem diagnosis and troubleshooting 1.1 Main cause analysis • Body contamination: Impurities, oil stains, scale, etc. in the medium adhere to the surface of the vortex generator, changing its geometric shape, resulting in a vortex frequency lower than normal and a calculated flow rate result that is smaller. Mechanical damage: Long term erosion and cavitation of solid particles in high flow media can cause wear and passivation of the upstream edge, which can also change the frequency of vortex shedding. • K coefficient variation: Both of the above situations directly cause a change in the K coefficient (the number of pulses corresponding to a unit volume flow rate) of the flowmeter, usually increasing, resulting in fewer pulse signals detected by the sensor at the same actual flow rate and a smaller displayed flow rate. 1.2 Quick on-site inspection steps 1 Check the cleanliness of the medium inside the pipeline and confirm if there are any newly introduced sources of pollution. 2. Check whether the straight pipe sections before and after the flowmeter meet the requirements (usually 10D before and 5D after). Eddy current or flow velocity distribution distortion will affect the measurement. 3. Check the installation of the flowmeter to ensure that the body axis is parallel to the pipeline axis and that the gasket does not protrude into the pipeline. 4. If possible, the flowmeter can be removed under safety conditions and visually inspected for cleanliness, wear, or damage on the surface of the vortex body. 2. Solution and Implementation 2.1 Online Cleaning For minor pollution, special chemical cleaning agents can be injected upstream of the flowmeter for cyclic cleaning while ensuring safety and cutting off the power supply to dissolve attachments. 2.2 Offline Maintenance If pollution is severe or there is mechanical damage. Damage, the flowmeter must be removed from the pipeline. • Cleaning: Use a soft cloth and neutral cleaning agent to gently wipe the affected area. It is strictly prohibited to use metal brushes or sharp tools to avoid scratching the surface. • Inspection and replacement: If visible wear, deformation, or damage is found on the generator, a new generator component must be replaced. 2.3 Re calibration: Whether cleaning or replacing the generator, the repaired flowmeter must be sent to a legal metrological calibration institution or a qualified laboratory for real flow calibration, re measurement, and accurate K coefficient setting. It is strictly prohibited to directly use the original coefficients on the nameplate or instruction manual. 3. Preventive maintenance recommendations: Install a filter or mesh that matches the diameter of the pipeline upstream of the flowmeter and clean it regularly. For media that are prone to scaling or contain impurities, plan a regular online cleaning schedule. According to the national verification regulations (such as JJG 1029-2007), combined with working conditions, develop a reasonable periodic verification plan (usually 1-2 years), and timely detect the drift of K coefficient through calibration. Operational hazard rem

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