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How to quickly solve faults encountered during the use of air vortex flowmeters

How to quickly solve faults encountered during the use of air vortex flowmeters

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When the air vortex flowmeter is powered on, the valve is not open and there is a signal output.

Solution

1) Poor shielding or grounding of the output signal of the sensor (or detection element) has attracted external electromagnetic interference.

2) The surface is too close to strong electrical equipment or high-frequency equipment, causing interference from spatial electromagnetic radiation and affecting the surface.

3) There is strong vibration in the equipment pipelines;

4) The converter’s sensitivity is too high, and its sensitivity to interfering signals is too high. The methods to be adopted are to enhance shielding and grounding, eliminate pipeline vibration, and adjust the activity of the descent converter.

2. For vortex flowmeters in intermittent operation, as long as the power supply is not cut off and the valve is closed, the output signal does not return to zero. The primary reasons might be the influence of pipeline vibration and external electromagnetic interference.

Solution: The activity of the converter should be reduced and the trigger level of the shaping circuit should be increased to suppress noise and prevent false triggering during intermittent periods.

3. When powered on, the output does not return to zero when the base valve is closed, but returns to zero when the upstream valve is closed. This is mainly due to the influence of the pulsating pressure of the fluid upstream of the flowmeter. Assuming that the vortex flowmeter is installed on a T-shaped branch pipe and there is pressure pulsation in the upstream main pipe, or there is a pulsating power source (such as a piston pump or Roots blower) upstream of the vortex flowmeter, the pulsating pressure constitutes a false signal of the vortex flowmeter.

Solution: Install the base valve upstream of the vortex flowmeter. When the machine stops, close the upstream valve to block the influence of pulsating pressure. However, when installing the equipment, the upstream valve should be as far away from the vortex flowmeter as possible and ensure the sufficient length of the straight pipe section.

4. Severe vibration of the pipeline (or environment), when the vibration direction is the same as the active direction of the surface detection element, completely suppresses the vortex signal, and the output signal is the vibration frequency signal. Adjusting the valve opening degree cannot change the output either.

Solution: Select vibration reduction methods (add anti-vibration seats to the pipes, fix the pipes), determine the vibration direction, rotate the sensor of the vortex flowmeter around the pipe axis by ± 90 ℃, and adjust the activity direction of the detection element to be perpendicular to the vibration direction. This can reduce the influence of vibration or appropriately lower the gain and trigger activity of the preamplifier. The above-mentioned methods can eliminate the influence of vibration.

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