Vortex flowmeter model supplier Surface sensitivity adjustment measures of vortex flowmeter

Vortex flowmeter model supplier Surface sensitivity adjustment measures for vortex flowmeters Surface sensitivity adjustment measures for vortex flowmeters: 1. Adjustment of amplifier gain Generally, it is not necessary to adjust the gain of the vortex flowmeter model amplifier. Except after replacing the sensor. Adjust the amplifier gain through the AMP potentiometer on the amplifier board A, and monitor the enlarged eddy current waveform on the oscilloscope. When the flow rate is small, the peak value of the eddy current waveform is about 100mVP-P. 2. Adjustment of trigger level The addition of trigger level (sensitivity of pulse attack) will reduce the sensitivity of flow. When there is no liquid activity in the pipeline, abnormal pulse attacks due to pipeline oscillations and pulsating activity noise can be effectively handled by adding trigger levels. The trigger level can be adjusted by the TRG potentiometer on the amplifier board of the vortex flowmeter, and whenever the peak value of the amplified eddy current waveform exceeds the predetermined trigger level, it can be converted into a pulse. Thus, flow sensitivity is reduced due to the addition of trigger levels. When the trigger level is changed from 80mVP-P to 350mVP-P, the sensitivity of the result will be 80/350u003d1/4.4 (sensitivity ratio) times. When the sensitivity is changed, the small flow rate (measurable low limit flow rate) of the result is about 1/(the square root of the sensitivity multiplied by the standard small flow rate). 3. Zero point adjustment The vortex flowmeter is accurately wired, and the low frequency signal generator is used to input a signal with zero amplitude to the vortex flowmeter, and the zero point adjustment potentiometer is adjusted. The displayed value of the digital multimeter should be 4mA. 4. Full-scale adjustment If you do not know the full-scale frequency of the surface, you can adjust the surface by calculating the full-scale frequency B after a large flow rate. 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 according to the above formula. At this time, the fixed frequency remains unchanged, and the range potentiometer is adjusted, and the digital multimeter stops when the indicated value is 20mA.

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