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『Guangzhou water flow meter』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)
1. Introduction to Water Flow Meter
The water flow meter is composed of two parts: a sensor and a converter. It works based on Faradays law of electromagnetic induction and is used to measure the volumetric flow rate of conductive liquids with a conductivity greater than 5 μ S/cm. Weimar Rang is an inductive instrument for measuring the volumetric flow rate of conductive media.
2. Reasons for Flow Fluctuations in Sealed Water Flow Meters
The main reasons for flow fluctuations in sealed water flow meters include changes in fluid characteristics, instrument installation issues, equipment self modification faults, and external interference, which require systematic investigation to determine the specific causes.
. 1. The fluid itself contains gas or cavitation: dissolved gases in water precipitate or cavitation bubbles are generated in the negative pressure section of the pipeline, causing measurement values to jump when flowing through the electrode. Uneven medium: The fluid contains flocculent substances, grease, or a mixture of solid and liquid phases, resulting in unstable flow velocity distribution and fluctuation of measurement electrode signals. 2. Installation and pipeline problems: Insufficient straight pipe section: The front end of the flowmeter does not retain enough straight pipe (usually requiring a front length of 10D and a back length of 5D), and valve and bend disturbances cause distortion of the flow velocity profile. Sealing leakage: When air enters the flange or threaded connection of the pipeline, small bubbles enter the measuring tube and interfere with the stability of the magnetic field. Unsatisfactory operation: The pipeline is not fully filled or the installation angle_600x400.jpg)
3. Instrument body failure and electrode aging: After long-term use, the electrode adheres to an insulating scale layer or undergoes electrochemical corrosion, resulting in signal acquisition distortion. Lining damage: After the wear of PTFE and other lining materials, the medium seeps into the excitation coil, causing a short circuit or magnetic field distortion. Grounding failure: Corrosion of the individual grounding ring or damage to the cable shielding layer introduces power frequency interference, causing signal output disorder
4. External interference factors: Power supply fluctuations: sudden changes in power supply voltage or start stop of nearby high-power equipment, coupled with interference converters through power lines. Strong electromagnetic interference: The flowmeter cable is laid in parallel with the frequency converter and motor power line, and no shielding measures are taken, resulting in signal superposition noise. Troubleshooting suggestion: Prioritize checking the gas-liquid mixing status and installation compliance of the pipeline, and then verify the accuracy of the instrument through offline calibration of the bridge. Pay attention to closing the valve and releasing pressure before operating the high-pressure pipeline during troubleshooting.
3. What are the specifications of a water flow meter?
Introduction: A water flow meter is composed of two important parts: a sensor and a converter, and its operation is based on the law of electromagnetic induction.
. The water flow meter can measure the volumetric flow rate of some conductive liquids, and the conductivity resistance