How to Adjust Vortex Flow Meter Sensitivity

Abstract: The information on how to adjust the sensitivity of the vortex flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. Vortex flowmeters are mainly used for flow measurement of medium fluids in industrial pipelines, such as gas, liquid, steam and other media. It is characterized by small pressure loss, large measuring range and high precision, and is almost independent of fluid density, pressure, temperature, etc. when measuring the volume flow under working conditions. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on how to adjust the sensitivity of the vortex flowmeter. Vortex flowmeters are mainly used for flow measurement of medium fluids in industrial pipelines, such as gas, liquid, steam and other media. It is characterized by small pressure loss, large measuring range, high precision, and is almost not affected by parameters such as fluid density, pressure, temperature, viscosity, etc. when measuring the volume flow of the working condition. When the vortex flowmeter has no liquid flow in the pipeline, the receiver counts abnormally due to the noise generated by the pipeline vibration. At this time, the sensitivity of the meter should be adjusted. 1. Adjustment of amplifier gain Generally, there is no need to adjust the gain of the vortex flowmeter amplifier unless the sensor is replaced. Adjust the amplifier gain through the AMP potentiometer on the amplifier board A, and monitor the amplified eddy current waveform on the oscilloscope. At the minimum flow rate, the peak value of the eddy current waveform is about 100mVP-P. 2. Adjustment of trigger level The increase of trigger level (sensitivity of pulse generation) will reduce the sensitivity of flow rate. When there is no liquid flow in the pipeline, abnormal pulse generation caused by pipeline vibration and pulsating flow noise can be effectively dealt with by increasing the trigger level. The trigger level is adjustable via the TRG potentiometer on the vortex flowmeter amplifier board, and whenever the peak of the amplified eddy current waveform exceeds a predetermined trigger level, it is converted into a pulse. Therefore, flow sensitivity decreases as the trigger level is increased. When the trigger level is changed from 80mVP-P to 350mVP-P, the resulting sensitivity will be 80/350=1/4.4 (sensitivity ratio) times. When changing the sensitivity, the resulting minimum flow (the lower limit flow that can be measured) is approximately 1/(square root of sensitivity times the standard minimum flow). 3. Zero point adjustment The correct wiring of the vortex flowmeter, input a signal with zero amplitude to the vortex flowmeter through the low frequency signal generator, adjust the zero point adjustment potentiometer, the display value of the digital multimeter should be 4mA. 4. Full-scale adjustment If you do not know the full-scale frequency of the instrument, you can adjust the instrument by calculating the full-scale frequency B through the maximum flow rate. The relationship is: fmax=Kmax Correct wiring, the vortex flowmeter generates a signal The output signal of the generator is sent to the charge amplifier, the amplitude of the input signal is increased, the output square wave is converted, and the output frequency of the signal generator is changed until the value displayed on the frequency meter is the full-scale frequency calculated by the above formula. At this time, the fixed frequency remains unchanged, and the range potentiometer is adjusted until the indicated value of the digital multimeter is 20mA. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'How to adjust the sensitivity of the vortex flowmeter'

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