What are the differences between a vortex flowmeter and a turbine flowmeter? Come in and learn more

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1. Working principle and common troubleshooting of Rosemount vortex flowmeter. The working principle of Rosemount vortex flowmeter is based on the Karman vortex phenomenon to achieve flow measurement. Its core principle is to detect the stable vortex frequency generated when the fluid passes around a cylindrical object, and calculate the fluid flow velocity and flow rate. The specific working process is as follows: Karman vortex street generation. When the fluid flows through the cylindrical vortex generator at a sufficient flow rate, two columns of vortices with opposite directions and neat arrangement will be alternately generated on both sides downstream of the generator, forming a "Karman vortex street". The vortex frequency (f) is proportional to the average flow velocity (v) of the fluid and the width of the incoming flow (d). The formula is: f=St · v/d, where St is the Strouhal number (dimensionless, Reynolds number Re is between 102-10?)? When within the range, St≈0.2）。 The signal detection and conversion vortex flowmeter detects the alternating lift generated by the vortex through a piezoelectric sensor, and converts the lift signal into an electrical frequency signal. After amplification and shaping, the signal can be directly output as a digital signal or output as a 4-20mA DC current through D/A conversion for display, recording, or control systems. Flow calculation can calculate the average fluid velocity (v) by measuring the vortex frequency (f), combined with the width of the generating body (d) and the Strouhal number (St). Based on the cross-sectional area of the pipeline (A), the volumetric flow rate (q) is obtained using the formula q=v · A. Figure: Common faults and troubleshooting methods of vortex flowmeter detection components and signal processing flow. The faults of Rosemount vortex flowmeter can be divided into system faults (such as wiring, power supply, interference, etc.) and instrument faults (such as sensor and electronic component damage). When processing, the principle of "system first, instrument later" should be followed, combined with process parameters and comprehensive analysis of recorded curves. 1. The indication value is unstable, sometimes without a reason: loose instrument wiring, oxidation, or poor contact. The coaxial cable from the sensor to the electronic component is aging, broken, or affected by high temperatures (such as in steam measurement scenarios). Solution: Check if the circuit wiring is tight and use a megohmmeter to test the insulation performance. Replace aging or damaged coaxial cables and sensors. Case: During the steam distillation and steam measurement in a certain factory, the sensor cable was burnt due to high temperature. After replacement, it returned to normal.

2. There is flow in the process, but the instrument does not indicate. Reason: abnormal power supply or circuit disconnection. Parameter setting error (such as excessive small signal cutoff value). Solution: Check the power supply voltage and restore the continuity of the circuit. Modify parameter settings to lower the small signal cutoff threshold. Case: A certain factory had no indication due to excessively high small signal cutoff settings. After adjustment, it was restored.

3. There was no flow rate in the process, and the instrument had indication. Reason: Improper parameter settings (such as high sensitivity and small signal cutoff). Poor grounding or strong electromagnetic interference (suc

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