Vortex flowmeter common faults and causes

4.1 Fault Symptom: After the newly installed or overhauled vortex flowmeter is installed on site, the display gauge has no indication.
Reason analysis: (1) There is no flow or flow in the pipeline, no vortex is generated in the sensor. (2) The sensitivity of the sensor is too low. (3) There is debris between the probe and the inner wall of the pipe.
4.2 Fault 2
Symptom: There is no fluid flow in the pipe, and the display instrument has flow display.
Cause analysis: (1) Poor instrument grounding introduces external interference (2) Sensor sensitivity is too high
4.3 Fault Symptom: The flow shows that the meter is swinging.
Analysis of the cause: (1) The sensitivity of the amplifier is not adjusted properly. (2) The flowmeter is not installed correctly, causing vibration of the medium passing through the meter.
4.4 Fault Symptom: The secondary meter indication is low and sluggish.
Analysis of the cause: It may be that the dirt is blocked between the probe and the inner wall, but it is not blocked.
4.5 Fault Symptom: A meter is used to indicate a certain scale, and no matter how the sensitivity potentiometer is used, it does not work.
Analysis of the cause: It is generally possible that a component inside the watch is damaged.
5 vortex flowmeter in the process of failure analysis of the fault phenomenon: indicating long-term inaccurate, always no indication, indicating that a wide range of fluctuations can not read, indicating no return to zero, no indication when small flow, the meter factor can not be determined.
Cause Analysis:
5.1 Selection problems The vortex flowmeters are designed and selected in the caliber selection. Due to the change of process conditions, the specification selection is too large. In the actual selection, the smallest possible diameter should be selected to improve the measurement accuracy. Improper selection may result in long-term inaccurate indications, indicating that the fluctuations are too large to read. For large flow rates, it is also possible to indicate an inaccurate phenomenon when the flow rate is small.
5.2 Installation problems The length of the straight pipe section at the front and back of the sensor is not enough, which may cause the indication to be inaccurate for a long time.
5.3 Problems with secondary instruments Common secondary instrument problems are short-circuited on the circuit board. The range setting of individual bits is bad, and the K-factor setting has a bad display of individual positions, making it impossible to determine the range setting and other parameter settings. This will make the meter indication inaccurate.
5.4 Loop Line Wiring Problem The connector is not connected properly, causing the circuit to be interrupted, so that the meter has no indication at all.
5.5 Connection problem between secondary instrument and subsequent instrument Due to the problem of the subsequent instrument or the subsequent instrument maintenance, the current signal output by the secondary instrument causes an open circuit, resulting in no indication of the secondary instrument.
5.6 Problems with the use environment In particular, sensors installed in the well may cause the board to be wet due to high humidity, and may also cause the meter to be inaccurate or always indicating no fault. The method of treatment is to regularly clean the vortex flowmeter probe, check the grounding and shielding, and regularly dry or do moisture-proof treatment.

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