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However, as a flow meter, under the conditions of quality and other conditions, it will also produce some failures due to some factors. What are the common faults of vortex flowmeters?
1. Analysis of signal output when there is no flow rate An interference signal is introduced into the instrument lead shielding or poor grounding; there is interference with strong electrical equipment or power lines around the instrument; the pipeline is strongly shaken. The solution is to strengthen the lead shielding to ensure that the line is well grounded; to keep the instrument away from sources of interference; to jump high trigger levels or to reduce shocks. 
2. The deviation of the indication error is too large and the repetitiveness is too large. The damage of the vortex body of the primary component is analyzed; the lengths of the upstream and downstream straight sections are not enough; the instrument constant K is only set incorrectly; the probe is heavily contaminated; the fluid in the pipeline is excessively disturbed. . The solution is to replace the vortex generator; change the installation location; recalibrate the meter to obtain the correct meter constant K; clean the probe; replace the installation site and increase the inlet pressure. 
3. After the power is turned on, there is no display on the secondary instrument.
Analysis of the reasons for the power supply wiring error or power disconnection; wiring voltage greater than 220V, electric furnace burnout; supply voltage and the instrument requires the supply voltage does not match; sensor failure or amplifier board failure; the road is too small or no flow in the pipeline. The solution is to check the wiring and correct the wiring; if it is damaged, find the damaged parts, replace the original parts; supply the power supply as required; replace the faulty parts of the secondary meter; adjust the flow of the pipeline.
4. The limit of flow rate expansion is limited. Select the flow display totalizer that can set the flow compensation correction factor, and use the software programming to realize the expansion of the lower limit of flow. Taking a triangular columnar vortex generator as an example, the Reynolds number range is 2×10 4 to 7×10 6 , which extends to 5×10 3 in order to achieve a lower flow limit, and should be corrected when measuring small flow rates. According to the theoretical compensation correction coefficient in the Reynolds number range of 5×103 to 2×104, the lower flow limit is expanded and the flow measurement error is compensated.
5. The reason for the abnormal output of the remote transmission signal is that if it is a frequency or pulse signal output, the receiving circuit is compatible with the output circuit; if it is a (4-20)mA current output, the flow setting range does not correspond to the output current one to one. The solution is an external electrical component (such as a resistor in series with a certain resistance) to make the output and input circuits compatible; the parameter settings for flow upper and lower limit values ​​correspond to 4mA and 20mA.
6. The flow rate is inaccurate, which is different from the process parameters. The reason is that the process parameters are entered incorrectly; the instrument range does not meet the actual flow requirements. The solution is: correctly enter the instrument parameters; adjust the process or select a suitable instrument for the actual flow range.
7. The meter constant K varies with the medium used. When the vortex flow sensor is used to measure the liquid flow, the meter constant K value should be used to calibrate the meter constant. When measuring the gas and steam, the meter constant K value should be calibrated with the gas. Although in principle, the value of the meter constant K has nothing to do with the nature of the measured medium, due to the processing technology of the sensor, there are differences among the manufacturers, and there will be some differences in the K values ​​of different fluids. Therefore, when using different media, calibration should be performed with the equivalent medium to obtain the meter constant K value. At the same time, when the medium temperature is higher than 150°C, the value of the meter constant K should also be corrected.
8. When the instrument is used for a period of time, the error deviates from the normal range. Since the industrial fluid medium often contains some impurities, the sensor should be cleaned within the specified time according to the specific situation.
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