Electromagnetic flowmeter in use will be affected by what conditions

After practice, there are mainly the following three aspects that affect the use of electromagnetic flowmeters , and these problems should be analyzed.

1. The measurement range of electromagnetic flowmeter is relatively large, generally 10:1, but the lower limit of measurement is limited by many factors: Re> 10000 is the most basic condition for vortex flowmeter work. In addition, it is also affected by the vortex generating response signal. The vortex frequency f is also small, and it also makes signal processing difficult. The upper limit of the measurement is the frequency response of the sensor and the frequency limit of the circuit. Therefore, the flow rate range must be calculated and calculated when designing, and the fluid flow rate should be selected. The use of on-site environmental conditions is complex. In addition to the environmental temperature, humidity, and atmosphere conditions, electromagnetic interference must be considered when selecting a model.

2, vibration is also a major rival of this type of instrument. Therefore, when using, care should be taken to avoid mechanical vibration, especially the transverse vibration of the pipe (the vibration of the axis of the vertical vortex generating body perpendicular to the axis of the pipe). This effect cannot be suppressed and eliminated in the structure design of the flowmeter. Since the vortex street signal is also sensitive to the influence of the flow field, the length of the straight pipe cannot be used to ensure the necessary flow conditions for the stable vortex street. Even a capacitive and ultrasonic type with strong vibration resistance ensures that the fluid is a fully developed unidirectional flow that cannot be ignored.

3, medium temperature has a great influence on the performance of vortex flowmeter. For example, pressure-stressed vortex flowmeters cannot be used at 300°C for a long period of time because their insulation resistance will suddenly drop from 10-100MΩ at normal temperature to 1-101Ω, and the output signal will also become smaller, leading to deterioration of measurement characteristics. In the measurement system, the sensor and converter should be separated and installed so as to avoid long-term high temperature affecting the reliability and service life of the meter. Vortex flowmeter is a relatively new type of flowmeter and it is still in its development stage. It is not very mature, and if it is not properly selected, its performance cannot be well exerted. Only after a reasonable selection and correct installation, but also need to maintain regularly in the use of the process, and constantly accumulate experience to improve the predictability of the system failure and ability to judge, deal with the problem, so as to achieve satisfactory results.

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