Vortex flowmeters often exhibit instability and excessive fluctuations, and there are many factors for this. The factors of the instrument panel itself include: the basic parameter setting is wrong, the sensor or the converter connection route is not well connected, the electronic components of the amplifier are destroyed, there are windings on the vortex generator, there are interference signals, etc. Processing process factors include: sensor or sealing gasket installation is not concentric, processing process flow is unstable and fluctuating, the medium is not filled with the pipeline, pipeline vibration, the straight pipe section of the pipeline does not meet the requirements, the measured medium is two-phase flow or pulsating flow, etc.
Many common faults of vortex flowmeters are closely related to the basic parameter settings. Use the HART handheld communicator to check the basic parameters of the vortex flowmeter and correct the basic parameters that are incorrect. Guess that the amplifier has common failures, and replace it with all normal amplifiers to judge common failures. Check whether the wiring terminals and wiring methods of the test loop at the construction site and control room are corroded, oxidized, or loose screws, and deal with them correctly. The vortex flowmeter can only measure single-phase flow. The measured liquid contains gas or the measured gas contains liquid. For gas-solid two-phase flow, the vortex flowmeter is not accurate, and the output signal will also fluctuate. Happening. The vortex flowmeter is afraid of the vibration of the instrument panel. The mechanical vibration of the processing pipeline will interfere with the fluctuation of the signal to the output signal of the instrument panel. Corresponding anti-vibration measures should be taken. Improper installation of the processing technology is also one of the important factors for the instability of the vortex flowmeter. Check whether the sensor and the processing pipeline are concentric, the inner diameter of the gasket is too small and protrudes into the pipeline, and there are windings on the generator body, which will interfere with the flow state of the signal medium and cause fluctuations. This kind of common fault can only be dismantled by stopping the watch for inspection or correct processing. The front and rear straight pipe sections of the sensor do not meet the requirements, and the sensor installation position must be changed to ensure the accuracy of the instrument panel measurement.