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『Troubleshooting of Vortex Flow Meter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. How to troubleshoot and handle air flow meter faults?
The troubleshooting of air flow meters should follow the order of starting with the periphery and then the interior, and starting with non fault abnormalities and then hardware faults. Step by step, locate and handle the problem.
1. First, eliminate non fault abnormalities (1) Installation and wiring inspection.
Check installation compliance: Different types of flow meters have different requirements for straight pipe sections. For example, vortex flow meters need to ensure that the front straight pipe section is ≥ 10 times the pipe diameter and the rear straight pipe section is ≥ 5 times the pipe diameter. Thermal mass flow meters need to be kept away from strong magnetic fields and vibration sources to avoid liquid accumulation during horizontal installation; 2. Check for loose wiring: Check whether the power supply and signal output terminals are oxidized or loose, especially the wiring parts under outdoor or vibration conditions; 3. Verify power supply parameters: Confirm that the power supply voltage meets the rated range, for example, the fluctuation of a conventional 24VDC system needs to be controlled within ± 10%, and undervoltage or overvoltage can cause sampling abnormalities. （2） Matching inspection of working conditions 1 Confirm medium parameters: Check whether impurities or moisture are mixed in the air, or if the temperature and pressure deviate from the calibration values of the flow meter. The thermal flow meter is sensitive to changes in the thermal conductivity of the medium, while the vortex flow meter is greatly affected by changes in fluid density; 2. Check for fluid abnormalities: Confirm whether there are conditions suc_600x400.jpg)
2. Hardware troubleshooting (1) Sensor component detection 1 Thermal flowmeter: Check whether the hot wire/hot film has accumulated dust and scale. Low pressure compressed air within 0.2MPa can be used for blowing, and it is strictly prohibited to scrape the sensor surface with hard objects; 2. Vortex flowmeter: Check whether there are foreign objects attached or loose to the piezoelectric/capacitive probe, and use a multimeter to measure whether the probe impedance meets the manufacturers calibrated parameter range; 3. Differential pressure flowmeter: Blow and clean the pressure hole and pipeline to eliminate signal abnormalities caused by blockage. （2） Circuit module detection 1 Use a multimeter to test the signal output circuit: for example, the load resistance of the 4-20mA circuit needs to match the requirements of the secondary instrument (250~600 Ω), and check for short circuits and open circuits; 2. Check the physical condition of the circuit board: check for signs of damage such as erosion, virtual soldering, and capacitor bulges; 3. Communication function test: For flow meters with communication protocols such as Hart and Modbus, test whether they can read and write configuration parameters normally, and confirm that the communication link is normal.
III. Troubleshooting of Software and Parameter Configuration 1 Verify calibration parameters: Confirm whether the medium type, pipe diameter, range and other configurations of the flowmeter are consistent with the ac